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Majorana corner states in a two-dimensional magnetic topological insulator on a high-temperature superconductor (2018)

Tao Liu, James Jun He, and Franco Nori (野理)

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-12-14

Description: Author(s): Tao Liu, James Jun He, and Franco Nori (野理) Conventional n -dimensional topological superconductors (TSCs) have protected gapless ( n − 1 ) -dimensional boundary states. In contrast to this, second-order TSCs are characterized by topologically protected gapless ( n − 2 ) -dimensional states with the usual gapped ( n − 1 ) boundaries. Here, we study a second... [Phys. Rev. B 98, 245413] Published Thu Dec 13, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Attractive Fermi polarons at nonzero temperatures with a finite impurity concentration (2018)

Hui Hu, Brendan C. Mulkerin, Jia Wang, and Xia-Ji Liu

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-07-26

Description: Author(s): Hui Hu, Brendan C. Mulkerin, Jia Wang, and Xia-Ji Liu We theoretically investigate how quasiparticle properties of an attractive Fermi polaron are affected by nonzero temperature and finite impurity concentration in three dimensions and in free space. By applying both non-self-consistent and self-consistent many-body T -matrix theories, we calculate the... [Phys. Rev. A 98, 013626] Published Wed Jul 25, 2018

Keywords: Matter waves and collective properties of cold atoms and molecules

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Multilayer-by-multilayer surface melting of Cu(200) (2018)

Kai Wang, Haizhen Wu, Mengke Ge, Xingang Hou, Ning Liu, Jia He, Wei Xi, and Jun Luo

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-07-26

Description: Author(s): Kai Wang, Haizhen Wu, Mengke Ge, Xingang Hou, Ning Liu, Jia He, Wei Xi, and Jun Luo It is well known that surface melting of metal materials is caused by vacancies, and melting proceeds layer by layer in theoretical predictions. However, the melting process has rarely been directly investigated in real time at atomic resolution. Herein, the (200) surface-melting process of Cu nanop... [Phys. Rev. B 98, 045425] Published Wed Jul 25, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Closed-form expressions for effective constitutive parameters: Electrostrictive and magnetostrictive tensors for bianisotropic metamaterials and their use in optical force density calculations (2018)

Neng Wang, Shubo Wang, Zhao-Qing Zhang, and C. T. Chan

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-07-26

Description: Author(s): Neng Wang, Shubo Wang, Zhao-Qing Zhang, and C. T. Chan Using a multiple scattering technique, we derived closed-form expressions for effective constitutive parameters and electro/magneto-strictive tensor components for 2D bianisotropic metamaterials. Using the principle of virtual work, we obtained the electromagnetic stress tensor that can be used to c... [Phys. Rev. B 98, 045426] Published Wed Jul 25, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Spin-1 topological monopoles in the parameter space of ultracold atoms (2018)

Haiping Hu and Chuanwei Zhang

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-07-27

Description: Author(s): Haiping Hu and Chuanwei Zhang A magnetic monopole is a hypothetical elementary particle with an isolated magnetic pole. Its existence would directly lead to the quantization of electric charges. In recent years, analogs of magnetic monopoles, represented by topological defects in parameter spaces, have been studied in a wide ran... [Phys. Rev. A 98, 013627] Published Thu Jul 26, 2018

Keywords: Matter waves and collective properties of cold atoms and molecules

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Engineering quantum spin liquids and many-body Majorana states with a driven superconducting box circuit (2018)

Fan Yang, Loïc Henriet, Ariane Soret, and Karyn Le Hur

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-07-27

Description: Author(s): Fan Yang, Loïc Henriet, Ariane Soret, and Karyn Le Hur We design a driven superconducting box with four spins S = 1 / 2 (qubits) such that coupled devices can give insight on the occurrence of quantum spin liquids and many-body Majorana states. Within one box or island, we introduce a generalized nuclear magnetic resonance algorithm to realize our models an... [Phys. Rev. B 98, 035431] Published Thu Jul 26, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Fingerprints of Berry phases in the bulk exciton spectrum of a topological insulator (2018)

Andrew A. Allocca, Dmitry K. Efimkin, and Victor M. Galitski

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-07-28

Description: Author(s): Andrew A. Allocca, Dmitry K. Efimkin, and Victor M. Galitski We examine excitons formed in the bulk of a topological insulator as the system is tuned via a parameter between topological and trivial insulating phases, arguing that nontrivial topology has fingerprints in the spectrum of these excitons. The closely related hydrogen atom problem is well known to ... [Phys. Rev. B 98, 045430] Published Fri Jul 27, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Structural, vibrational, and electronic properties of single-layer hexagonal crystals of group IV and V elements (2018)

Burak Özdamar, Gözde Özbal, M. Neşet Çınar, Koray Sevim, Gizem Kurt, Birnur Kaya, and Hâldun Sevinçli

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-07-28

Description: Author(s): Burak Özdamar, Gözde Özbal, M. Neşet Çınar, Koray Sevim, Gizem Kurt, Birnur Kaya, and Hâldun Sevinçli Using first-principles density functional theory calculations, we investigate a family of stable two-dimensional crystals with chemical formula A 2 B 2 , where A and B belong to groups IV and V, respectively ( A = C , Si, Ge, Sn, Pb; B = N , P, As, Sb, Bi). Two structural symmetries of hexagonal lattices P 6 ¯ m 2 ... [Phys. Rev. B 98, 045431] Published Fri Jul 27, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Topological invariants in dissipative extensions of the Su-Schrieffer-Heeger model (2018)

Felix Dangel, Marcel Wagner, Holger Cartarius, Jörg Main, and Günter Wunner

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-07-28

Description: Author(s): Felix Dangel, Marcel Wagner, Holger Cartarius, Jörg Main, and Günter Wunner We investigate dissipative extensions of the Su-Schrieffer-Heeger model with regard to different approaches of modeling dissipation. In doing so, we use two distinct frameworks to describe the gain and loss of particles: One uses Lindblad operators within the scope of Lindblad master equations, and ... [Phys. Rev. A 98, 013628] Published Fri Jul 27, 2018

Keywords: Matter waves and collective properties of cold atoms and molecules

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Many-body stabilization of a resonant $p$-wave Fermi gas in one dimension (2018)

Lei Pan, Shu Chen, and Xiaoling Cui

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-07-31

Description: Author(s): Lei Pan, Shu Chen, and Xiaoling Cui Using the asymptotic Bethe ansatz, we study the stabilization problem of the one-dimensional spin-polarized Fermi gas confined in a hard-wall potential with a tunable p -wave scattering length and finite effective range. We find that the interplay of two factors, i.e., the finite interaction range an... [Phys. Rev. A 98, 011603(R)] Published Mon Jul 30, 2018

Keywords: Matter waves and collective properties of cold atoms and molecules

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Empirical pseudopotential method with nonspherical passivants for the atomistic study of silicon nanostructures (2018)

J. R. Cárdenas

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-07-31

Description: Author(s): J. R. Cárdenas Atomistic calculations of passivated nanostructures remain difficult due to the computational demands related to the high number of atoms to be typically considered. The empirical pseudopotential method (EPM) offers a good alternative in this sense, but finding trustable pseudopotentials for passiva... [Phys. Rev. B 98, 045308] Published Mon Jul 30, 2018

Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Phase transitions on a ladder of braided non-Abelian anyons (2018)

Babatunde M. Ayeni, Robert N. C. Pfeifer, and Gavin K. Brennen

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-07-31

Description: Author(s): Babatunde M. Ayeni, Robert N. C. Pfeifer, and Gavin K. Brennen Non-Abelian anyons can exist as pointlike particles in two-dimensional systems and have particle exchange statistics which are neither bosonic nor fermionic. Like in spin systems, the role of fusion (Heisenberg-like) interactions between anyons has been well studied. However, unlike our understandin... [Phys. Rev. B 98, 045432] Published Mon Jul 30, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Born-Bogoliubov-Green-Kirkwood-Yvon hierarchy for ultracold bosonic systems (2018)

Sven Krönke and Peter Schmelcher

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-07-31

Description: Author(s): Sven Krönke and Peter Schmelcher We establish a theoretical framework for exploring the quantum dynamics of finite ultracold bosonic ensembles based on the Born-Bogoliubov-Green-Kirkwood-Yvon (BBGKY) hierarchy for equations of motion for few-particle reduced density matrices (RDMs). The theory applies to zero as well as low tempera... [Phys. Rev. A 98, 013629] Published Mon Jul 30, 2018

Keywords: Matter waves and collective properties of cold atoms and molecules

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Berry phase of the composite-fermion Fermi sea: Effect of Landau-level mixing (2018)

Songyang Pu, Mikael Fremling, and J. K. Jain

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-04

Description: Author(s): Songyang Pu, Mikael Fremling, and J. K. Jain We construct explicit lowest-Landau-level wave functions for the composite-fermion Fermi sea and its low-energy excitations following a recently developed approach [Pu, Wu, and Jain, Phys. Rev. B 96 , 195302 (2017) ] and demonstrate them to be very accurate representations of the Coulomb eigenstates. ... [Phys. Rev. B 98, 075304] Published Fri Aug 03, 2018

Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Spin-orbit-coupled soliton in a random potential (2018)

Sh. Mardonov, V. V. Konotop, B. A. Malomed, M. Modugno, and E. Ya. Sherman

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-08-07

Description: Author(s): Sh. Mardonov, V. V. Konotop, B. A. Malomed, M. Modugno, and E. Ya. Sherman We investigate theoretically the dynamics of a spin-orbit-coupled soliton formed by a self-interacting Bose-Einstein condensate immersed in a random potential, in the presence of an artificial magnetic field. We find that, due to the anomalous spin-dependent velocity, the synthetic Zeeman coupling c... [Phys. Rev. A 98, 023604] Published Mon Aug 06, 2018

Keywords: Matter waves and collective properties of cold atoms and molecules

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Andreev transport through single-molecule magnets (2018)

F. Pawlicki and I. Weymann

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-08

Description: Author(s): F. Pawlicki and I. Weymann The Andreev transport through a large-spin magnetic molecule, such as a single molecular magnet, attached to superconducting and ferromagnetic leads is studied theoretically by means of the real-time diagrammatic technique. It is shown that due to the proximity effect, molecular Andreev bound states... [Phys. Rev. B 98, 085411] Published Tue Aug 07, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Coupled wire model of ${Z}_{4}$ orbifold quantum Hall states (2018)

Charles L. Kane and Ady Stern

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-07

Description: Author(s): Charles L. Kane and Ady Stern We introduce a coupled wire model for a sequence of non-Abelian quantum Hall states that generalize the Z 4 parafermion Read-Rezayi state. The Z 4 orbifold quantum Hall states occur at filling factors ν = 2 / ( 2 m − p ) for odd integers m and p , and have a topological order with a neutral sector characterized... [Phys. Rev. B 98, 085302] Published Mon Aug 06, 2018

Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Two-phonon Raman bands of single-walled carbon nanotubes: A case study (2018)

Valentin N. Popov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-08

Description: Author(s): Valentin N. Popov It has been long accepted that the second-order Raman bands in carbon nanotubes are enhanced through the double-resonance mechanism. Although separate aspects of this mechanism have been studied for a few second-order Raman bands, including the most intense defect-induced D band and the two-phonon 2... [Phys. Rev. B 98, 085413] Published Tue Aug 07, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Shubnikov–de Haas oscillations in the anomalous Hall conductivity of Chern insulators (2018)

Luis M. Canonico, Jose H. García, Tatiana G. Rappoport, Aires Ferreira, and R. B. Muniz

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-07

Description: Author(s): Luis M. Canonico, Jose H. García, Tatiana G. Rappoport, Aires Ferreira, and R. B. Muniz The Haldane model on a honeycomb lattice is a paradigmatic example of a system featuring quantized Hall conductivity in the absence of an external magnetic field, that is, a quantum anomalous Hall effect. Recent theoretical work predicted that the anomalous Hall conductivity of massive Dirac fermion... [Phys. Rev. B 98, 085409] Published Mon Aug 06, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Second harmonic generation in the plasmon-polariton gap of quasiperiodic metamaterial photonic superlattices (2018)

F. Reyes Gómez, N. Porras-Montenegro, Osvaldo N. Oliveira, Jr., and J. R. Mejía-Salazar

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-08

Description: Author(s): F. Reyes Gómez, N. Porras-Montenegro, Osvaldo N. Oliveira, Jr., and J. R. Mejía-Salazar Self-similar bulk plasmon-polariton modes in quasiperiodic photonic superlattices were used here for a giant enhancement of second harmonic generation. Results for Fibonacci and Thue-Morse-like superlattices indicate that not only the disorder but also the symmetry of the unit cell plays a crucial r... [Phys. Rev. B 98, 075406] Published Tue Aug 07, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Polarization-controlled coherent phonon generation in acoustoplasmonic metasurfaces (2018)

Norberto D. Lanzillotti-Kimura, Kevin P. O’Brien, Junsuk Rho, Haim Suchowski, Xiaobo Yin, and Xiang Zhang

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-06-05

Description: Author(s): Norberto D. Lanzillotti-Kimura, Kevin P. O’Brien, Junsuk Rho, Haim Suchowski, Xiaobo Yin, and Xiang Zhang Acoustic vibrations at the nanoscale (GHz-THz frequencies) and their interactions with electrons, photons, and other excitations are the heart of an emerging field in physics: nanophononics. The design of ultrahigh frequency acoustic-phonon transducers, with tunable frequency, and easy to integrate ... [Phys. Rev. B 97, 235403] Published Mon Jun 04, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Intrinsic and anisotropic Rashba spin splitting in Janus transition-metal dichalcogenide monolayers (2018)

Tao Hu, Fanhao Jia, Guodong Zhao, Jiongyao Wu, Alessandro Stroppa, and Wei Ren

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-06-05

Description: Author(s): Tao Hu, Fanhao Jia, Guodong Zhao, Jiongyao Wu, Alessandro Stroppa, and Wei Ren Transition-metal dichalcogenides (TMDs) monolayers have been considered as important two-dimensional semiconductor materials for the study of fundamental physics in the field of spintronics. However, the out-of-plane mirror symmetry in TMDs may constrain electrons' degrees of freedom and it may limi... [Phys. Rev. B 97, 235404] Published Mon Jun 04, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Current-induced spin polarization in the isotropic $k$-cubed Rashba model: Theoretical study of $p$-doped semiconductor heterostructures and perovskite-oxide interfaces (2018)

Ł. Karwacki, A. Dyrdał, J. Berakdar, and J. Barnaś

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-06-05

Description: Author(s): Ł. Karwacki, A. Dyrdał, J. Berakdar, and J. Barnaś Using the Matsubara Green's function formalism, we calculate the temperature dependence of the nonequilibrium spin polarization induced by an external electric field in the presence of spin-orbit coupling. The model Hamiltonian includes an isotropic k -cubed form of the Rashba spin-orbit interaction.... [Phys. Rev. B 97, 235302] Published Mon Jun 04, 2018

Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Interface-induced spin-orbit interaction in silicon quantum dots and prospects for scalability (2018)

Rifat Ferdous, Kok W. Chan, Menno Veldhorst, J. C. C. Hwang, C. H. Yang, Harshad Sahasrabudhe, Gerhard Klimeck, Andrea Morello, Andrew S. Dzurak, and Rajib Rahman

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-06-05

Description: Author(s): Rifat Ferdous, Kok W. Chan, Menno Veldhorst, J. C. C. Hwang, C. H. Yang, Harshad Sahasrabudhe, Gerhard Klimeck, Andrea Morello, Andrew S. Dzurak, and Rajib Rahman We identify the presence of monatomic steps at the Si/SiGe or Si / SiO 2 interface as a dominant source of variations in the dephasing time of silicon (Si) quantum dot (QD) spin qubits. First, using atomistic tight-binding calculations we show that the g -factors and their Stark shifts undergo variation... [Phys. Rev. B 97, 241401(R)] Published Mon Jun 04, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Strong and weak second-order topological insulators with hexagonal symmetry and ℤ${}_{3}$ index (2018)

Motohiko Ezawa

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-06-05

Description: Author(s): Motohiko Ezawa We propose second-order topological insulators (SOTIs) whose lattice structure has a hexagonal symmetry C 6 . We start with a three-dimensional weak topological insulator constructed on a stacked triangular lattice, which has only side topological surface states. We then introduce an additional mass t... [Phys. Rev. B 97, 241402(R)] Published Mon Jun 04, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Positronium formation at Si surfaces (2018)

A. Kawasuso, M. Maekawa, A. Miyashita, K. Wada, T. Kaiwa, and Y. Nagashima

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-06-06

Description: Author(s): A. Kawasuso, M. Maekawa, A. Miyashita, K. Wada, T. Kaiwa, and Y. Nagashima Positronium formation at Si(111) and Si(001) surfaces has been investigated by changing the doping level systematically over the range 300–1000 K. The temperature dependence of the positronium fraction varied with the doping condition, and there were practically no differences between the two surfac... [Phys. Rev. B 97, 245303] Published Tue Jun 05, 2018

Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Post-Ehrenfest many-body quantum interferences in ultracold atoms far out of equilibrium (2018)

Steven Tomsovic, Peter Schlagheck, Denis Ullmo, Juan-Diego Urbina, and Klaus Richter

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-06-15

Description: Author(s): Steven Tomsovic, Peter Schlagheck, Denis Ullmo, Juan-Diego Urbina, and Klaus Richter Far out-of-equilibrium many-body quantum dynamics in isolated systems necessarily generates interferences beyond an Ehrenfest timescale, where quantum and classical expectation values diverge. Of great recent interest is the role these interferences play in the spreading of quantum information acros... [Phys. Rev. A 97, 061606(R)] Published Thu Jun 14, 2018

Keywords: Matter waves and collective properties of cold atoms and molecules

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Nonlocal pair correlations in Lieb-Liniger gases: A unified nonperturbative approach from weak degeneracy to high temperatures (2018)

Benjamin Geiger, Quirin Hummel, Juan Diego Urbina, and Klaus Richter

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-06-16

Description: Author(s): Benjamin Geiger, Quirin Hummel, Juan Diego Urbina, and Klaus Richter We present analytical results for the nonlocal pair correlations in one-dimensional bosonic systems with repulsive contact interactions that are uniformly valid from the classical regime of high temperatures down to weak quantum degeneracy entering the regime of ultralow temperatures. By using the i... [Phys. Rev. A 97, 063612] Published Fri Jun 15, 2018

Keywords: Matter waves and collective properties of cold atoms and molecules

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Wigner function of noninteracting trapped fermions (2018)

David S. Dean, Pierre Le Doussal, Satya N. Majumdar, and Grégory Schehr

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-06-16

Description: Author(s): David S. Dean, Pierre Le Doussal, Satya N. Majumdar, and Grégory Schehr The Wigner function is studied for trapped noninteracting fermions. Universal scaling behavior of the function, independent of the trapping potential and the spatial dimension, is found at both zero and finite temperatures. [Phys. Rev. A 97, 063614] Published Fri Jun 15, 2018

Keywords: Matter waves and collective properties of cold atoms and molecules

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Dimer-dimer zero crossing and dilute dimerized liquid in a one-dimensional mixture (2018)

A. Pricoupenko and D. S. Petrov

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-06-16

Description: Author(s): A. Pricoupenko and D. S. Petrov We consider the system of dimers formed in a one-dimensional mass-balanced Bose-Bose mixture of species σ = ↑ , ↓ with attractive interspecies and repulsive intraspecies contact interactions. In the plane parametrized by the ratios of the coupling constants g ↑ ↑ / | g ↑ ↓ | and g ↓ ↓ / | g ↑ ↓ | we trace out the curve... [Phys. Rev. A 97, 063616] Published Fri Jun 15, 2018

Keywords: Matter waves and collective properties of cold atoms and molecules

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Berry curvature in monolayer ${\mathrm{MoS}}_{2}$ with broken mirror symmetry (2018)

Kyung-Han Kim and Hyun-Woo Lee

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-06-16

Description: Author(s): Kyung-Han Kim and Hyun-Woo Lee An ideal 1 H phase monolayer MoS 2 has mirror reflection symmetry, but this symmetry is broken in common experimental situations, where the monolayer is placed on a substrate. By using k · p perturbation theory, we investigate the effect of mirror symmetry breaking on the Berry curvature of the material... [Phys. Rev. B 97, 235423] Published Fri Jun 15, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Exciton-polarons in doped semiconductors in a strong magnetic field (2018)

Dmitry K. Efimkin and Allan H. Mac; Donald

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-06-22

Description: Author(s): Dmitry K. Efimkin and Allan H. MacDonald In previous work, we have argued that the optical properties of moderately doped two-dimensional semiconductors can be described in terms of excitons dressed by their interactions with a degenerate Fermi sea of additional charge carriers. These interactions split the bare exciton into attractive and... [Phys. Rev. B 97, 235432] Published Thu Jun 21, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Atomic visualization of copper oxide structure in the infinite-layer cuprate $\mathrm{SrCu}{\mathrm{O}}_{2}$ (2018)

Yong Zhong, Sha Han, Yang Wang, Zhiling Luo, Ding Zhang, Lili Wang, Wei Li, Ke He, Can-Li Song, Xu-Cun Ma, and Qi-Kun Xue

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-06-23

Description: Author(s): Yong Zhong, Sha Han, Yang Wang, Zhiling Luo, Ding Zhang, Lili Wang, Wei Li, Ke He, Can-Li Song, Xu-Cun Ma, and Qi-Kun Xue We report the atomic-scale structure of epitaxial films of the parent infinite-layer compound SrCu O 2 prepared on SrTiO 3 by molecular beam epitaxy. In situ scanning tunneling microscopy study reveals a stoichiometric copper oxide ( CuO 2 ) -terminated surface featured by 2 × 2 reconstruction, caused prima... [Phys. Rev. B 97, 245420] Published Fri Jun 22, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Temperature-dependent terahertz spectroscopy of inverted-band three-layer InAs/GaSb/InAs quantum well (2018)

S. S. Krishtopenko, S. Ruffenach, F. Gonzalez-Posada, G. Boissier, M. Marcinkiewicz, M. A. Fadeev, A. M. Kadykov, V. V. Rumyantsev, S. V. Morozov, V. I. Gavrilenko, C. Consejo, W. Desrat, B. Jouault, W. Knap, E. Tournié, and F. Teppe

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-06-23

Description: Author(s): S. S. Krishtopenko, S. Ruffenach, F. Gonzalez-Posada, G. Boissier, M. Marcinkiewicz, M. A. Fadeev, A. M. Kadykov, V. V. Rumyantsev, S. V. Morozov, V. I. Gavrilenko, C. Consejo, W. Desrat, B. Jouault, W. Knap, E. Tournié, and F. Teppe We report on temperature-dependent terahertz spectroscopy of a three-layer InAs/GaSb/InAs quantum well (QW) with inverted-band structure. The interband optical transitions, measured up to 16 T at different temperatures by Landau-level magnetospectroscopy, demonstrate the inverted-band structure of t... [Phys. Rev. B 97, 245419] Published Fri Jun 22, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Molecular dynamics studies of ion beam implantation and patterning of silicon: Effect of noble gas cluster formation (2018)

Michael A. Lively, Samuel X. Bennett, and Jean Paul Allain

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-06-27

Description: Author(s): Michael A. Lively, Samuel X. Bennett, and Jean Paul Allain The use of energetic ion beams to induce nanopattern formation at surfaces has been well studied both experimentally and theoretically. However, the influence on morphological evolution of the implanted species themselves remains little understood, particularly in the case when the incident ion spec... [Phys. Rev. B 97, 235443] Published Tue Jun 26, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Magnetoplasmonic enhancement of Faraday rotation in patterned graphene metasurfaces (2018)

Michele Tamagnone, Tetiana M. Slipchenko, Clara Moldovan, Peter Q. Liu, Alba Centeno, Hamed Hasani, Amaia Zurutuza, Adrian M. Ionescu, Luis Martin-Moreno, Jérôme Faist, Juan R. Mosig, Alexey B. Kuzmenko, and Jean-Marie Poumirol

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-06-27

Description: Author(s): Michele Tamagnone, Tetiana M. Slipchenko, Clara Moldovan, Peter Q. Liu, Alba Centeno, Hamed Hasani, Amaia Zurutuza, Adrian M. Ionescu, Luis Martin-Moreno, Jérôme Faist, Juan R. Mosig, Alexey B. Kuzmenko, and Jean-Marie Poumirol Faraday rotation is a fundamental property present in all nonreciprocal optical elements. In the THz range, graphene displays strong Faraday rotation; unfortunately, it is limited to frequencies below the cyclotron resonance. Here, we show experimentally that in specifically designed metasurfaces, m... [Phys. Rev. B 97, 241410(R)] Published Tue Jun 26, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Band-edge levels of the NaCl(100) surface: Self-consistent hybrid density functional theory compared to many-body perturbation theory (2018)

Manuel Hochheim and Thomas Bredow

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-06-28

Description: Author(s): Manuel Hochheim and Thomas Bredow The electronic gap of bulk NaCl and the band-edge levels of the NaCl(100) surface are calculated using GW methods and self-consistent dielectric dependent hybrid functionals. Optical spectra are calculated by solving the Bethe-Salpeter equations (GW-BSE). For the calculation of the electronic struct... [Phys. Rev. B 97, 235447] Published Wed Jun 27, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Interplay of the Kondo effect with the induced pairing in electronic and caloric properties of T-shaped double quantum dots (2018)

Krzysztof P. Wójcik and Ireneusz Weymann

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-06-28

Description: Author(s): Krzysztof P. Wójcik and Ireneusz Weymann We examine the influence of the superconducting proximity effect on the transport properties of a T-shaped double quantum dot strongly coupled to two normal, nonmagnetic or ferromagnetic leads. We show that the two-stage Kondo screening may be suppressed or enhanced by the presence of pairing correl... [Phys. Rev. B 97, 235449] Published Wed Jun 27, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Dimensional crossover for the beyond-mean-field correction in Bose gases (2018)

Tobias Ilg, Jan Kumlin, Luis Santos, Dmitry S. Petrov, and Hans Peter Büchler

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-27

Description: Author(s): Tobias Ilg, Jan Kumlin, Luis Santos, Dmitry S. Petrov, and Hans Peter Büchler We present a detailed beyond-mean-field analysis of a weakly interacting Bose gas in the crossover from three to low dimensions. We find an analytical solution for the energy and provide a clear qualitative picture of the crossover in the case of a box potential with periodic boundary conditions. We... [Phys. Rev. A 98, 051604(R)] Published Mon Nov 26, 2018

Keywords: Matter waves and collective properties of cold atoms and molecules

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Order parameter and detection for a finite ensemble of crystallized one-dimensional dipolar bosons in optical lattices (2018)

Budhaditya Chatterjee and Axel U. J. Lode

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-27

Description: Author(s): Budhaditya Chatterjee and Axel U. J. Lode We explore the ground-state properties of a few bosons with dipole-dipole interactions in a one-dimensional optical lattice. For comparatively strong interactions, a transition from a Mott-insulator state to a crystal state occurs. Herein, we provide a detailed characterization and a detection proto... [Phys. Rev. A 98, 053624] Published Mon Nov 26, 2018

Keywords: Matter waves and collective properties of cold atoms and molecules

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Measurement of the Casimir force in a gas and in a liquid (2018)

Anne Le Cunuder, Artyom Petrosyan, George Palasantzas, Vitaly Svetovoy, and Sergio Ciliberto

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-11-29

Description: Author(s): Anne Le Cunuder, Artyom Petrosyan, George Palasantzas, Vitaly Svetovoy, and Sergio Ciliberto We present detailed measurements of the Casimir-Lifshitz force between two gold surfaces, performed in both gas (nitrogen) and liquid (ethanol) environments with the same apparatus and on the same spot of the sample. Furthermore, we study the role of double-layer forces in the liquid, and we show th... [Phys. Rev. B 98, 201408(R)] Published Wed Nov 28, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Screening cloud and non-Fermi-liquid scattering in topological Kondo devices (2018)

A. Latief and B. Béri

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-11-29

Description: Author(s): A. Latief and B. Béri The topological Kondo effect arises when conduction electrons in metallic leads are coupled to a mesoscopic superconducting island with Majorana fermions. Working with its minimal setup, we study the lead electron local tunneling density of states in its thermally smeared form motivated by scanning ... [Phys. Rev. B 98, 205427] Published Wed Nov 28, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Chiral Majorana edge states in the vortex core of a $p+ip$ Fermi superfluid (2018)

Jing-Bo Wang, Wei Yi, and Jian-Song Pan

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-28

Description: Author(s): Jing-Bo Wang, Wei Yi, and Jian-Song Pan We study Majorana modes in the vortex core of a two-dimensional p + i p Fermi superfluid interacting with a Bose-Einstein condensate. Under a repulsive s -wave contact interaction between fermions and bosons, fermions are depleted from the vortex core when the bosonic density becomes sufficiently high. ... [Phys. Rev. A 98, 053630] Published Tue Nov 27, 2018

Keywords: Matter waves and collective properties of cold atoms and molecules

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Phonon-induced linewidths of graphene electronic states (2018)

Bo Hellsing, Thomas Frederiksen, Federico Mazzola, Thiagarajan Balasubramanian, and Justin W. Wells

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-11-30

Description: Author(s): Bo Hellsing, Thomas Frederiksen, Federico Mazzola, Thiagarajan Balasubramanian, and Justin W. Wells The linewidths of the π and σ bands originating from the electron-phonon coupling in graphene are analyzed based on model calculations and experimental angle-resolved photoemission spectroscopy (ARPES) data. We find evidence for crucial contributions to the lifetime broadening from interband scatter... [Phys. Rev. B 98, 205428] Published Thu Nov 29, 2018

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Possible flexoelectric origin of the Lifshitz transition in ${\mathrm{LaAlO}}_{3}/{\mathrm{SrTiO}}_{3}$ interfaces (2018)

Amany Raslan and W. A. Atkinson

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-12-01

Description: Author(s): Amany Raslan and W. A. Atkinson Multiple experiments have observed a sharp transition in the band structure of LaAlO 3 / SrTiO 3 (001) interfaces as a function of applied gate voltage. This Lifshitz transition, between a single occupied band at low electron density and multiple occupied bands at high density, is remarkable for its abr... [Phys. Rev. B 98, 195447] Published Fri Nov 30, 2018

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Spatial confinement, magnetic localization, and their interactions on massless Dirac fermions (2018)

Zhong-Qiu Fu, Yu Zhang, Jia-Bin Qiao, Dong-Lin Ma, Haiwen Liu, Zi-Han Guo, Yi-Cong Wei, Jing-Yi Hu, Qian Xiao, Xin-Rui Mao, and Lin He

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-12-04

Description: Author(s): Zhong-Qiu Fu, Yu Zhang, Jia-Bin Qiao, Dong-Lin Ma, Haiwen Liu, Zi-Han Guo, Yi-Cong Wei, Jing-Yi Hu, Qian Xiao, Xin-Rui Mao, and Lin He Understanding different approaches to confining massless Dirac fermions in graphene is of keen interest to researchers; it is also a central problem in making electronic devices based on graphene. Here, we studied spatial confinement, magnetic localization, and their interactions on massless Dirac f... [Phys. Rev. B 98, 241401(R)] Published Mon Dec 03, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Sign inversion in the terahertz photoconductivity of single-walled carbon nanotube films (2018)

Peter Karlsen, Mikhail V. Shuba, Polina P. Kuzhir, Albert G. Nasibulin, Patrizia Lamberti, and Euan Hendry

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-12-04

Description: Author(s): Peter Karlsen, Mikhail V. Shuba, Polina P. Kuzhir, Albert G. Nasibulin, Patrizia Lamberti, and Euan Hendry In recent years, there have been conflicting reports regarding the ultrafast photoconductive response of films of single walled carbon nanotubes (CNTs), which apparently exhibit photoconductivities that can differ even in sign. Here, we observe explicitly that the THz photoconductivity of CNT films ... [Phys. Rev. B 98, 241404(R)] Published Mon Dec 03, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Twisted graphene bilayer around the first magic angle engineered by heterostrain (2018)

Jia-Bin Qiao, Long-Jing Yin, and Lin He

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-12-04

Description: Author(s): Jia-Bin Qiao, Long-Jing Yin, and Lin He Very recently, twisted graphene bilayers (TGBs) around the first magic angle θ ≈ 1 . 1 ∘ have attracted much attention for the realization of exotic quantum states, such as correlated insulator behavior and unconventional superconductivity. Here we elaborately study a series of TGBs around the first magi... [Phys. Rev. B 98, 235402] Published Mon Dec 03, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Proximity-induced spin-orbit coupling in graphene/${\mathrm{Bi}}_{1.5}{\mathrm{Sb}}_{0.5}{\mathrm{Te}}_{1.7}{\mathrm{Se}}_{1.3}$ heterostructures (2018)

S. Jafarpisheh, A. W. Cummings, K. Watanabe, T. Taniguchi, B. Beschoten, and C. Stampfer

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-12-04

Description: Author(s): S. Jafarpisheh, A. W. Cummings, K. Watanabe, T. Taniguchi, B. Beschoten, and C. Stampfer The weak intrinsic spin-orbit coupling in graphene can be greatly enhanced by proximity coupling. Here, we report on the proximity-induced spin-orbit coupling in graphene transferred by hexagonal boron nitride (hBN) onto the topological insulator Bi 1.5 Sb 0.5 Te 1.7 Se 1.3 (BSTS) which was grown on a hBN ... [Phys. Rev. B 98, 241402(R)] Published Mon Dec 03, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Generating macroscopic superpositions with interacting Bose-Einstein condensates: Multimode speedups and speed limits (2018)

Samuel P. Nolan and Simon A. Haine

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-12-05

Description: Author(s): Samuel P. Nolan and Simon A. Haine We theoretically investigate the effect of multimode dynamics on the creation of macroscopic superposition states (spin-cat states) in Bose-Einstein condensates via one-axis twisting. A two-component Bose-Einstein condensate naturally realizes an effective one-axis twisting interaction, under which ... [Phys. Rev. A 98, 063606] Published Tue Dec 04, 2018

Keywords: Matter waves and collective properties of cold atoms and molecules

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Quantum reflection of rare-gas atoms and clusters from a grating (2018)

G. Rojas-Lorenzo, J. Rubayo-Soneira, S. Miret-Artés, and E. Pollak

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-12-05

Description: Author(s): G. Rojas-Lorenzo, J. Rubayo-Soneira, S. Miret-Artés, and E. Pollak Quantum reflection is a universal property of atoms and molecules when scattered from surfaces in ultracold collisions. Recent experimental work has documented the quantum reflection and diffraction of He atoms, dimers, trimers, and neon atoms when reflected from a grating. Conditions for the observ... [Phys. Rev. A 98, 063604] Published Tue Dec 04, 2018

Keywords: Matter waves and collective properties of cold atoms and molecules

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Gauge-potential-induced rotation of spin-orbit-coupled Bose-Einstein condensates (2018)

Jingjing Jin, Wei Han, and Suying Zhang

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-12-05

Description: Author(s): Jingjing Jin, Wei Han, and Suying Zhang We demonstrate that a spin-orbit-coupled Bose-Einstein condensate can be effectively rotated by adding a real magnetic field to inputting gauge angular momentum, which is distinctly different from the traditional ways of rotation by stirring or Raman laser dressing to inputting canonical angular mom... [Phys. Rev. A 98, 063607] Published Tue Dec 04, 2018

Keywords: Matter waves and collective properties of cold atoms and molecules

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Duality for open fermion systems: Energy-dependent weak coupling and quantum master equations (2018)

J. Schulenborg, J. Splettstoesser, and M. R. Wegewijs

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-12-05

Description: Author(s): J. Schulenborg, J. Splettstoesser, and M. R. Wegewijs Open fermion systems with energy-independent bilinear coupling to a fermionic environment have been shown to obey a general duality relation [J. Schulenborg et al. , Phys. Rev. B 93 , 081411 (2016) ] which allows for a drastic simplification of time-evolution calculations. In the weak-coupling limit, ... [Phys. Rev. B 98, 235405] Published Tue Dec 04, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Dihedral-angle-corrected registry-dependent interlayer potential for multilayer graphene structures (2018)

Mingjian Wen, Stephen Carr, Shiang Fang, Efthimios Kaxiras, and Ellad B. Tadmor

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-12-05

Description: Author(s): Mingjian Wen, Stephen Carr, Shiang Fang, Efthimios Kaxiras, and Ellad B. Tadmor The structural relaxation of multilayer graphene is essential in describing the interesting electronic properties induced by intentional misalignment of successive layers, including the recently reported superconductivity in twisted bilayer graphene. This is difficult to accomplish without an accura... [Phys. Rev. B 98, 235404] Published Tue Dec 04, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Cavity optomagnonics with magnetic textures: Coupling a magnetic vortex to light (2018)

Jasmin Graf, Hannes Pfeifer, Florian Marquardt, and Silvia Viola Kusminskiy

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-12-06

Description: Author(s): Jasmin Graf, Hannes Pfeifer, Florian Marquardt, and Silvia Viola Kusminskiy A unique feature of cavity optomagnonics is the possibility of coherently coupling light to spin excitations on top of magnetic textures. Here, the authors propose a cavity-optomagnonic system with a nonhomogeneous magnetic ground state, namely, a vortex in a magnetic microdisc. Using both analytical and computational methods, they study the cavity-enhanced coupling between optical whispering gallery modes and magnon modes, localized at the vortex. The results, both in terms of value and tunability of the coupling, point to the promise of engineered optomagnonic systems for quantum information platforms. [Phys. Rev. B 98, 241406(R)] Published Wed Dec 05, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Enhanced performance of a quantum-dot-based nanomotor due to Coulomb interactions (2018)

María Florencia Ludovico and Massimo Capone

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-12-06

Description: Author(s): María Florencia Ludovico and Massimo Capone We study the relation between quantum pumping of charge and the work exchanged with the driving potentials in a strongly interacting ac -driven quantum dot. We work in the large-interaction limit and in the adiabatic pumping regime, and we develop a treatment that combines the time-dependent slave-bo... [Phys. Rev. B 98, 235409] Published Wed Dec 05, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Realizing an ultra-wideband backward-wave metamaterial waveguide (2018)

S. S. Seetharaman, B. Tremain, W. L. Barnes, and I. R. Hooper

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-12-06

Description: Author(s): S. S. Seetharaman, B. Tremain, W. L. Barnes, and I. R. Hooper Electroinductive waves have emerged as an attractive solution for designing metamaterials that support backward propagating waves. Stacked metasurfaces etched with complementary split-ring resonators (CSRRs) have also been shown to exhibit a broadband negative dispersion. We demonstrate, through exp... [Phys. Rev. B 98, 235408] Published Wed Dec 05, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Droplet formation in a one-dimensional system of attractive spinless fermions (2018)

Vera V. Vyborova, Oleg Lychkovskiy, and Alexey N. Rubtsov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-12-06

Description: Author(s): Vera V. Vyborova, Oleg Lychkovskiy, and Alexey N. Rubtsov A translation invariant one-dimensional system of spinless fermions with a finite-range attraction experiences a quantum phase transition to a phase-separated state. While being a conventional Luttinger liquid for a small interaction strength, spinless fermions form a droplet with the size smaller t... [Phys. Rev. B 98, 235407] Published Wed Dec 05, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Relation between width of zero-bias anomaly and Kondo temperature in transport measurements through correlated quantum dots: Effect of asymmetric coupling to the leads (2018)

D. Pérez Daroca, P. Roura-Bas, and A. A. Aligia

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-12-07

Description: Author(s): D. Pérez Daroca, P. Roura-Bas, and A. A. Aligia The zero-bias anomaly at low temperatures, originated by the Kondo effect when an electric current flows through a system formed by a spin- 1 / 2 quantum dot and two metallic contacts is theoretically investigated. In particular, we compare the width of this anomaly 2 T NE with that of the Kondo resonanc... [Phys. Rev. B 98, 245406] Published Thu Dec 06, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Finite-wave-vector electromagnetic response in lattice quantum Hall systems (2018)

Fenner Harper, David Bauer, T. S. Jackson, and Rahul Roy

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-12-07

Description: Author(s): Fenner Harper, David Bauer, T. S. Jackson, and Rahul Roy In a quantum Hall system, the finite-wave-vector Hall conductivity displays an intriguing dependence on the Hall viscosity. Here, the authors study this connection for quantum Hall systems on a lattice and find that the neat continuum relation breaks down. In the process, they introduce a universal formalism for studying lattice quantum Hall systems and find that, in the low flux density limit, generic lattice wave functions connect smoothly to the Landau levels of the continuum. They also introduce a quantum mechanical method for calculating the electromagnetic response of such systems. [Phys. Rev. B 98, 245303] Published Thu Dec 06, 2018

Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Topological edge states in Rashba-Dresselhaus spin-orbit-coupled atoms in a Zeeman lattice (2018)

C. Li, F. Ye, X. Chen, Y. V. Kartashov, L. Torner, and V. V. Konotop

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-12-08

Description: Author(s): C. Li, F. Ye, X. Chen, Y. V. Kartashov, L. Torner, and V. V. Konotop We address the impact of spin-orbit coupling on the existence and properties of topological edge states of cold neutral atoms and Bose-Einstein condensates loaded in honeycomb Zeeman lattices—lattices where the spinor components are placed in potentials having opposite signs. We find that the type o... [Phys. Rev. A 98, 061601(R)] Published Fri Dec 07, 2018

Keywords: Matter waves and collective properties of cold atoms and molecules

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Measuring the local gravitational field using survival resonances in a dissipatively driven atom-optics system (2018)

Shijie Chai, Julia Fekete, and Mikkel F. Andersen

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-12-11

Description: Author(s): Shijie Chai, Julia Fekete, and Mikkel F. Andersen We do a proof-of-principle demonstration of an atomic gravimeter based on survival resonances of dissipatively driven atoms. Exposing laser-cooled atoms to a sequence of near-resonant standing-wave light pulses reveals survival resonances when the standing-wave interference pattern accelerates. The ... [Phys. Rev. A 98, 063614] Published Mon Dec 10, 2018

Keywords: Matter waves and collective properties of cold atoms and molecules

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Spectroscopy and level detuning of few-electron spin states in parallel InAs quantum dots (2018)

Claes Thelander, Malin Nilsson, Florinda Viñas Boström, Adam Burke, Sebastian Lehmann, Kimberly A. Dick, and Martin Leijnse

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-12-11

Description: Author(s): Claes Thelander, Malin Nilsson, Florinda Viñas Boström, Adam Burke, Sebastian Lehmann, Kimberly A. Dick, and Martin Leijnse We use tunneling spectroscopy to study the evolution of few-electron spin states in parallel InAs nanowire double quantum dots (QDs) as a function of level detuning and applied magnetic field. Compared to the much more studied serial configuration, parallel coupling of the QDs to source and drain gr... [Phys. Rev. B 98, 245305] Published Mon Dec 10, 2018

Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Negative charge enhancement of near-surface nitrogen vacancy centers by multicolor excitation (2018)

I. Meirzada, Y. Hovav, S. A. Wolf, and N. Bar-Gill

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-12-12

Description: Author(s): I. Meirzada, Y. Hovav, S. A. Wolf, and N. Bar-Gill Nitrogen vacancy (NV) centers in diamond have been identified over the past few years as promising systems for a variety of applications, ranging from quantum information science to magnetic sensing. This relies on the unique optical and spin properties of the negatively charged NV. Many of these ap... [Phys. Rev. B 98, 245411] Published Tue Dec 11, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Stabilizing Fulde-Ferrell-Larkin-Ovchinnikov superfluidity with long-range interactions in a mixed-dimensional Bose-Fermi system (2018)

Jonatan Melkær Midtgaard and Georg M. Bruun

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-07-25

Description: Author(s): Jonatan Melkær Midtgaard and Georg M. Bruun We analyze the stability of inhomogeneous superfluid phases in a system consisting of identical fermions confined in two layers that are immersed in a Bose-Einstein condensate (BEC). The fermions in the two layers interact via an induced interaction mediated by the BEC, which gives rise to pairing. ... [Phys. Rev. A 98, 013624] Published Tue Jul 24, 2018

Keywords: Matter waves and collective properties of cold atoms and molecules

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Effect of wire length on quantum coherence in InGaAs wires (2018)

Yuantao Xie and J. J. Heremans

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-07-25

Description: Author(s): Yuantao Xie and J. J. Heremans Quantum phase coherence lengths were experimentally measured in nanolithographic wires to investigate the effects of wire length on quantum decoherence, which can be limited by mechanisms such as coupling to an external classical environment. The work demonstrates that device geometry and coupling t... [Phys. Rev. B 98, 035429] Published Tue Jul 24, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Efficient orbital angular momentum transfer between plasmons and free electrons (2018)

Wei Cai, Ori Reinhardt, Ido Kaminer, and F. Javier García de Abajo

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-07-25

Description: Author(s): Wei Cai, Ori Reinhardt, Ido Kaminer, and F. Javier García de Abajo Free electrons can efficiently absorb or emit plasmons excited in a thin conductor, giving rise to multiple energy peaks in the transmitted electron spectra separated by multiples of the plasmon energy. When the plasmons are chiral, this can also give rise to transfer of orbital angular momentum (OA... [Phys. Rev. B 98, 045424] Published Tue Jul 24, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Electron spin noise under the conditions of nuclei-induced frequency focusing (2018)

Natalie Jäschke, Frithjof B. Anders, and Mikhail M. Glazov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-07-25

Description: Author(s): Natalie Jäschke, Frithjof B. Anders, and Mikhail M. Glazov We study theoretically the electron spin noise in quantum dots under nonequilibrium conditions caused by the pumping by a train of circularly polarized optical pulses. In such a situation, the nuclear spins are known to adjust in such a way that the electron spin precession frequencies become multip... [Phys. Rev. B 98, 045307] Published Tue Jul 24, 2018

Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Diffusion of quantum vortices (2018)

E. Rickinson, N. G. Parker, A. W. Baggaley, and C. F. Barenghi

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-08-08

Description: Author(s): E. Rickinson, N. G. Parker, A. W. Baggaley, and C. F. Barenghi We determine the evolution of a cluster of quantum vortices initially placed at the center of a larger vortex-free region. We find that the cluster spreads out spatially. This spreading motion consists of two effects: the rapid evaporation of vortex dipoles from the cluster and the slow expansion of... [Phys. Rev. A 98, 023608] Published Tue Aug 07, 2018

Keywords: Matter waves and collective properties of cold atoms and molecules

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Spin- and valley-dependent negative magnetoresistance in a ferromagnetic ${\mathrm{MoS}}_{2}$ junction with a quantum well (2018)

Wei-Tao Lu, Hong-Yu Tian, Hong-Mei Liu, Yun-Fang Li, and Wen Li

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-07

Description: Author(s): Wei-Tao Lu, Hong-Yu Tian, Hong-Mei Liu, Yun-Fang Li, and Wen Li We studied the spin and valley transports and magnetoresistance effect in a MoS 2 junction with a quantum well inserted between the gate voltage and the ferromagnetic MoS 2 , which can apply generally to other transition metal dichalcogenides with the same crystal structure. In the absence of a quantum... [Phys. Rev. B 98, 075405] Published Mon Aug 06, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Strain-engineered Majorana zero energy modes and ${φ}_{0}$ Josephson state in black phosphorus (2018)

Mohammad Alidoust, Morten Willatzen, and Antti-Pekka Jauho

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-08

Description: Author(s): Mohammad Alidoust, Morten Willatzen, and Antti-Pekka Jauho We develop a theory for strain control of Majorana zero energy modes and the Josephson effect in black phosphorus (BP) devices proximity coupled to a superconductor. Employing realistic values for the band parameters subject to strain, we show that the strain closes the intrinsic band gap of BP; how... [Phys. Rev. B 98, 085414] Published Tue Aug 07, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Sliding of an electron crystal of finite size on the surface of superfluid $^{4}\mathrm{He}$ confined in a microchannel (2018)

J.-Y. Lin, A. V. Smorodin, A. O. Badrutdinov, and D. Konstantinov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-08

Description: Author(s): J.-Y. Lin, A. V. Smorodin, A. O. Badrutdinov, and D. Konstantinov We present a new study of the nonlinear transport of a two-dimensional electron crystal on the surface of liquid helium confined in a 10 − μ m -wide channel in which the effective length of the crystal can be varied from 10 to 215 μ m . At low driving voltages, the moving electron crystal is strongly coupl... [Phys. Rev. B 98, 085412] Published Tue Aug 07, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Vortex patterns and the critical rotational frequency in rotating dipolar Bose-Einstein condensates (2018)

Yongyong Cai, Yongjun Yuan, Matthias Rosenkranz, Han Pu, and Weizhu Bao

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-08-11

Description: Author(s): Yongyong Cai, Yongjun Yuan, Matthias Rosenkranz, Han Pu, and Weizhu Bao Based on the two-dimensional mean-field equations for pancake-shaped dipolar Bose-Einstein condensates in a rotating frame, for both attractive and repulsive dipole-dipole interaction (DDI) as well as arbitrary polarization direction, we study the profiles of the single vortex state and show how the... [Phys. Rev. A 98, 023610] Published Fri Aug 10, 2018

Keywords: Matter waves and collective properties of cold atoms and molecules

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Dependence of the adsorption height of graphenelike adsorbates on their dimensionality (2018)

S. Weiß, D. Gerbert, A. Stein, A. K. Schenk, X. Yang, C. Brülke, R. Kremring, S. Feldmann, F. C. Bocquet, M. Gille, S. Hecht, M. Sokolowski, P. Tegeder, S. Soubatch, and F. S. Tautz

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-11

Description: Author(s): S. Weiß, D. Gerbert, A. Stein, A. K. Schenk, X. Yang, C. Brülke, R. Kremring, S. Feldmann, F. C. Bocquet, M. Gille, S. Hecht, M. Sokolowski, P. Tegeder, S. Soubatch, and F. S. Tautz Comparing the adsorption heights of various graphene nanoribbons on Cu(111) and Au(111) surfaces to those of graphene and π -conjugated planar organic molecules, we observe that two-dimensional graphene adsorbs much further away from the surface than both one-dimensional graphene nanoribbons and π -co... [Phys. Rev. B 98, 075410] Published Fri Aug 10, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Dynamical quantum phase transitions in systems with broken continuous time and space translation symmetries (2018)

Arkadiusz Kosior, Andrzej Syrwid, and Krzysztof Sacha

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-08-14

Description: Author(s): Arkadiusz Kosior, Andrzej Syrwid, and Krzysztof Sacha Spontaneous breaking of continuous time translation symmetry into a discrete one is related to time crystal formation. While the phenomenon is not possible in the ground state of a time-independent many-body system, it can occur in an excited eigenstate. Here, we concentrate on bosons on a ring with... [Phys. Rev. A 98, 023612] Published Mon Aug 13, 2018

Keywords: Matter waves and collective properties of cold atoms and molecules

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Nonperturbative method to compute thermal correlations in one-dimensional systems (2018)

Stefan Beck, Igor E. Mazets, and Thomas Schweigler

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-08-14

Description: Author(s): Stefan Beck, Igor E. Mazets, and Thomas Schweigler We develop a highly efficient method to numerically simulate thermal fluctuations and correlations in nonrelativistic continuous bosonic one-dimensional systems. The method is suitable for arbitrary local interactions as long as the system remains dynamically stable. We start by proving the equivale... [Phys. Rev. A 98, 023613] Published Mon Aug 13, 2018

Keywords: Matter waves and collective properties of cold atoms and molecules

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Numerical study of the chiral ${\mathbb{Z}}_{3}$ quantum phase transition in one spatial dimension (2018)

Rhine Samajdar, Soonwon Choi, Hannes Pichler, Mikhail D. Lukin, and Subir Sachdev

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-08-14

Description: Author(s): Rhine Samajdar, Soonwon Choi, Hannes Pichler, Mikhail D. Lukin, and Subir Sachdev Recent experiments on a one-dimensional chain of trapped alkali-metal atoms [Bernien et al. , Nature (London) 551 , 579 (2017) ] have observed a quantum transition associated with the onset of period-3 ordering of pumped Rydberg states. This spontaneous Z 3 symmetry breaking is described by a constrain... [Phys. Rev. A 98, 023614] Published Mon Aug 13, 2018

Keywords: Matter waves and collective properties of cold atoms and molecules

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Single-beam optical measurement of spin dynamics in CdTe/(Cd,Mg)Te quantum wells (2018)

F. Saeed, M. Kuhnert, I. A. Akimov, V. L. Korenev, G. Karczewski, M. Wiater, T. Wojtowicz, A. Ali, A. S. Bhatti, D. R. Yakovlev, and M. Bayer

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-14

Description: Author(s): F. Saeed, M. Kuhnert, I. A. Akimov, V. L. Korenev, G. Karczewski, M. Wiater, T. Wojtowicz, A. Ali, A. S. Bhatti, D. R. Yakovlev, and M. Bayer We study optical pumping of resident electron spins under resonant excitation of trions in n -type CdTe/(Cd,Mg)Te quantum wells subject to a transverse magnetic field. In contrast to the comprehensively used time-resolved pump-probe techniques with polarimetric detection, we exploit here a single bea... [Phys. Rev. B 98, 075308] Published Mon Aug 13, 2018

Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Thermoelectric properties of a quantum dot coupled to magnetic leads by Rashba spin-orbit interaction (2018)

Łukasz Karwacki and Józef Barnaś

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-14

Description: Author(s): Łukasz Karwacki and Józef Barnaś We consider a single-level quantum dot coupled to two leads which are ferromagnetic in general. Apart from tunneling processes conserving electron spin, we also include processes associated with spin flip of tunneling electrons, which appear due to Rashba spin-orbit coupling. Charge and heat current... [Phys. Rev. B 98, 075413] Published Mon Aug 13, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Temperature- and frequency-dependent optical and transport conductivities in doped buckled honeycomb lattices (2018)

Andrii Iurov, Godfrey Gumbs, and Danhong Huang

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-14

Description: Author(s): Andrii Iurov, Godfrey Gumbs, and Danhong Huang Thermal and dynamical properties of optical and transport conductivities in doped buckled honeycomb lattices are studied for various doping densities and band gaps. At finite temperatures, a thermally convoluted polarization function is calculated by employing analytically derived temperature-depend... [Phys. Rev. B 98, 075414] Published Mon Aug 13, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Flux-driven and geometry-controlled spin filtering for arbitrary spins in aperiodic quantum networks (2018)

Amrita Mukherjee, Arunava Chakrabarti, and Rudolf A. Römer

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-14

Description: Author(s): Amrita Mukherjee, Arunava Chakrabarti, and Rudolf A. Römer We demonstrate that an aperiodic array of certain quantum networks comprising magnetic and nonmagnetic atoms can act as perfect spin filters for particles with arbitrary spin state. This can be achieved by introducing minimal quasi-one dimensionality in the basic structural units building up the arr... [Phys. Rev. B 98, 075415] Published Mon Aug 13, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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From topologically protected coherent perfect reflection to bound states in the continuum (2018)

Shiwei Dai, Liang Liu, Dezhuan Han, and Jian Zi

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-15

Description: Author(s): Shiwei Dai, Liang Liu, Dezhuan Han, and Jian Zi A mechanism for perfect reflection is proposed for the dielectric medium beyond the total internal reflection and band gaps. It arises from the coherence of multiple propagating modes, and can be determined by the topological vortex of a transmission coefficient with a nonzero winding number in para... [Phys. Rev. B 98, 081405(R)] Published Tue Aug 14, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Two-dimensional ferroelastic topological insulators in single-layer Janus transition metal dichalcogenides $M\mathrm{SSe}(M=\mathrm{Mo},\mathrm{W})$ (2018)

Yandong Ma, Liangzhi Kou, Baibiao Huang, Ying Dai, and Thomas Heine

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-15

Description: Author(s): Yandong Ma, Liangzhi Kou, Baibiao Huang, Ying Dai, and Thomas Heine Two-dimensional topological insulators and two-dimensional materials with ferroelastic characteristics are intriguing materials and many examples have been reported both experimentally and theoretically. Here, we present the combination of both features—a two-dimensional ferroelastic topological ins... [Phys. Rev. B 98, 085420] Published Tue Aug 14, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Field-effect-driven half-metallic multilayer graphene (2018)

Jacopo Baima, Francesco Mauri, and Matteo Calandra

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-16

Description: Author(s): Jacopo Baima, Francesco Mauri, and Matteo Calandra Rhombohedral stacked multilayer graphene displays the occurrence of a magnetic surface state at low temperatures. Recent angular resolved photoemission experiments demonstrate the robustness of the magnetic state in long sequences of ABC graphene. Here, by using first-principles calculations, we sho... [Phys. Rev. B 98, 075418] Published Wed Aug 15, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Barium titanate nanoparticles: Short-range lattice distortions with long-range cubic order (2018)

Chenyang Shi, Simon J. L. Billinge, Eric Puma, Sun Hwi Bang, Nathaniel J. H. Bean, Jean-Claude de Sugny, Robert G. Gambee, Richard C. Haskell, Adrian Hightower, and Todd C. Monson

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-16

Description: Author(s): Chenyang Shi, Simon J. L. Billinge, Eric Puma, Sun Hwi Bang, Nathaniel J. H. Bean, Jean-Claude de Sugny, Robert G. Gambee, Richard C. Haskell, Adrian Hightower, and Todd C. Monson Barium titanate (BTO) nanoparticles (sizes 10–500 nm) exhibit a displacement of the Ti atom from the center of the perovskite unit cell as inferred from synchrotron x-ray diffraction patterns (XRD) analyzed using atomic pair distribution functions (PDFs). Fits to PDFs acquired at temperatures of 20 ... [Phys. Rev. B 98, 085421] Published Wed Aug 15, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Quantum transport through three-dimensional topological insulator p-n junction under magnetic field (2018)

Ning Dai, Yan-Feng Zhou, Peng Lv, and Qing-Feng Sun

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-16

Description: Author(s): Ning Dai, Yan-Feng Zhou, Peng Lv, and Qing-Feng Sun The three-dimensional (3D) topological insulator (TI) p-n junction under magnetic fields presents an interesting transport property which is investigated both theoretically and numerically in this paper. Transport in this device can be tuned by the axial magnetic field. Specifically, the scattering ... [Phys. Rev. B 98, 085422] Published Wed Aug 15, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Radii of Rydberg states of isolated silicon donors (2018)

Juerong Li, Nguyen H. Le, K. L. Litvinenko, S. K. Clowes, H. Engelkamp, S. G. Pavlov, H.-W. Hübers, V. B. Shuman, L. М. Portsel, А. N. Lodygin, Yu. A. Astrov, N. V. Abrosimov, C. R. Pidgeon, A. Fisher, Zaiping Zeng, Y.-M. Niquet, and B. N. Murdin

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-16

Description: Author(s): Juerong Li, Nguyen H. Le, K. L. Litvinenko, S. K. Clowes, H. Engelkamp, S. G. Pavlov, H.-W. Hübers, V. B. Shuman, L. М. Portsel, А. N. Lodygin, Yu. A. Astrov, N. V. Abrosimov, C. R. Pidgeon, A. Fisher, Zaiping Zeng, Y.-M. Niquet, and B. N. Murdin We have performed high field magnetoabsorption spectroscopy on silicon doped with a variety of single and double donor species. The magnetic field provides access to an experimental magnetic length, and the quadratic Zeeman effect, in particular, may be used to extract the wave-function radius witho... [Phys. Rev. B 98, 085423] Published Wed Aug 15, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Electron spin inversion in gated silicene nanoribbons (2018)

Bartłomiej Rzeszotarski and Bartłomiej Szafran

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-16

Description: Author(s): Bartłomiej Rzeszotarski and Bartłomiej Szafran We study locally gated silicene nanoribbons as spin active devices and we solve the quantum scattering problem in the atomistic tight-binding formalism. Particular attention is paid to the low energy range for which only four subbands appear at the Fermi level. We find that the gated segments of zig... [Phys. Rev. B 98, 075417] Published Wed Aug 15, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Decay and revival of electron spin polarization in an ensemble of (In,Ga)As quantum dots (2018)

E. Evers, V. V. Belykh, N. E. Kopteva, I. A. Yugova, A. Greilich, D. R. Yakovlev, D. Reuter, A. D. Wieck, and M. Bayer

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-16

Description: Author(s): E. Evers, V. V. Belykh, N. E. Kopteva, I. A. Yugova, A. Greilich, D. R. Yakovlev, D. Reuter, A. D. Wieck, and M. Bayer The periodic optical orientation of electron spins in (In,Ga)As/GaAs quantum dots leads to the formation of electron spin precession modes about an external magnetic field which are resonant with the pumping periodicity. As the electron spin is localized within a nuclear spin bath, its polarization ... [Phys. Rev. B 98, 075309] Published Wed Aug 15, 2018

Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Femtosecond valley polarization and topological resonances in transition metal dichalcogenides (2018)

S. Azar Oliaei Motlagh, Jhih-Sheng Wu, Vadym Apalkov, and Mark I. Stockman

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-16

Description: Author(s): S. Azar Oliaei Motlagh, Jhih-Sheng Wu, Vadym Apalkov, and Mark I. Stockman We theoretically introduce the fundamentally fastest induction of a significant population and valley polarization in a monolayer of a transition metal dichalcogenide (i.e., MoS 2 and WS 2 ). This may be extended to other two-dimensional materials with the same symmetry. This valley polarization can be... [Phys. Rev. B 98, 081406(R)] Published Wed Aug 15, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Vortices in self-bound dipolar droplets (2018)

André Cidrim, Francisco E. A. dos Santos, Emanuel A. L. Henn, and Tommaso Macrì

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-08-16

Description: Author(s): André Cidrim, Francisco E. A. dos Santos, Emanuel A. L. Henn, and Tommaso Macrì Quantized vortices have been observed in a variety of superfluid systems, from He 4 to condensates of alkali-metal bosons and ultracold Fermi gases along the BEC-BCS crossover. In this article we study the stability of singly quantized vortex lines in dilute dipolar self-bound droplets. We first disc... [Phys. Rev. A 98, 023618] Published Wed Aug 15, 2018

Keywords: Matter waves and collective properties of cold atoms and molecules

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Emergence of continuous rotational symmetries in ultracold atoms coupled to optical cavities (2018)

E. I. Rodríguez Chiacchio and A. Nunnenkamp

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-08-16

Description: Author(s): E. I. Rodríguez Chiacchio and A. Nunnenkamp We investigate the physics of a gas of ultracold atoms coupled to three single-mode optical cavities and transversely pumped with a laser. Recent work has demonstrated that, for two cavities, the Z 2 symmetries of each cavity can be combined into a global U(1) symmetry [J. Léonard et al. , Nature (Lon... [Phys. Rev. A 98, 023617] Published Wed Aug 15, 2018

Keywords: Matter waves and collective properties of cold atoms and molecules

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Macroscopic quantum escape of Bose-Einstein condensates: Analysis of experimentally realizable quasi-one-dimensional traps (2018)

Diego A. Alcala, Gregor Urban, Matthias Weidemüller, and Lincoln D. Carr

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-08-16

Description: Author(s): Diego A. Alcala, Gregor Urban, Matthias Weidemüller, and Lincoln D. Carr The variational JWKB method is used to determine experimentally accessible macroscopic quantum tunneling regimes of quasibound Bose-Einstein condensates in two quasi-one-dimensional trap configurations. The potentials can be created by magnetic and optical traps: a symmetric trap from two offset Gau... [Phys. Rev. A 98, 023619] Published Wed Aug 15, 2018

Keywords: Matter waves and collective properties of cold atoms and molecules

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Impact of complex adatom-induced interactions on quantum spin Hall phases (2018)

Flaviano José dos Santos, Dario A. Bahamon, Roberto B. Muniz, Keith McKenna, Eduardo V. Castro, Johannes Lischner, and Aires Ferreira

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-18

Description: Author(s): Flaviano José dos Santos, Dario A. Bahamon, Roberto B. Muniz, Keith McKenna, Eduardo V. Castro, Johannes Lischner, and Aires Ferreira Adsorbate engineering offers a seemingly simple approach to tailor spin-orbit interactions in atomically thin materials and thus to unlock the much sought-after topological insulating phases in two dimensions. However, the observation of an Anderson topological transition induced by heavy adatoms ha... [Phys. Rev. B 98, 081407(R)] Published Fri Aug 17, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Dynamical signature of the moiré pattern in a non-Hermitian ladder (2018)

X. M. Yang, X. Z. Zhang, C. Li, and Z. Song

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-18

Description: Author(s): X. M. Yang, X. Z. Zhang, C. Li, and Z. Song We study the dynamical behavior of a non-Hermitian moire superlattice system, which consists of two-coupled Su-Schrieffer-Heeger (SSH) chains with staggered imaginary on-site potentials. The slight difference, which indicates that the in-lattice spacing of nearest-neighbor lattice sites at the top i... [Phys. Rev. B 98, 085306] Published Fri Aug 17, 2018

Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Large negative magnetoresistance driven by enhanced weak localization and Kondo effect at the interface of $\mathrm{LaAl}{\mathrm{O}}_{3}$ and Fe-doped $\mathrm{SrTi}{\mathrm{O}}_{3}$ (2018)

Hongxia Xue, Yanpeng Hong, Chengjian Li, Jianchao Meng, Yongchun Li, Kejian Liu, Mingrui Liu, Weimin Jiang, Zhe Zhang, Lin He, Ruifen Dou, Changmin Xiong, and Jiacai Nie

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-18

Description: Author(s): Hongxia Xue, Yanpeng Hong, Chengjian Li, Jianchao Meng, Yongchun Li, Kejian Liu, Mingrui Liu, Weimin Jiang, Zhe Zhang, Lin He, Ruifen Dou, Changmin Xiong, and Jiacai Nie The out-of-plane magnetoresistance of a LaAl O 3 / SrTi O 3 interface is commonly positive due to significant orbital effect. In this paper, a large negative magnetoresistance is observed at a LaAl O 3 and Fe-doped SrTi O 3 interface upon the application of an out-of-plane magnetic field. Such large negative ... [Phys. Rev. B 98, 085305] Published Fri Aug 17, 2018

Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Wenchao Xu, William Morong, Hoi-Yin Hui, Vito W. Scarola, and Brian De; Marco

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-08-21

Description: Author(s): Wenchao Xu, William Morong, Hoi-Yin Hui, Vito W. Scarola, and Brian DeMarco We report the realization of correlated, density-dependent tunneling for fermionic K 40 atoms trapped in an optical lattice. By appropriately tuning the frequency difference between a pair of Raman beams applied to a spin-polarized gas, simultaneous spin transitions and tunneling events are induced t... [Phys. Rev. A 98, 023623] Published Mon Aug 20, 2018

Keywords: Matter waves and collective properties of cold atoms and molecules

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Photoinduced valley and electron-hole symmetry breaking in $α−{T}_{3}$ lattice: The role of a variable Berry phase (2018)

Bashab Dey and Tarun Kanti Ghosh

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-23

Description: Author(s): Bashab Dey and Tarun Kanti Ghosh We consider an α − T 3 lattice illuminated by intense circularly polarized radiation in the terahertz regime. We present the quasienergy band structure, time-averaged energy spectrum, and time-averaged density of states of an α − T 3 lattice by solving the Floquet Hamiltonian numerically. We obtain exact ... [Phys. Rev. B 98, 075422] Published Wed Aug 22, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Unconventional topological superconductivity and phase diagram for an effective two-orbital model as applied to twisted bilayer graphene (2018)

M. Fidrysiak, M. Zegrodnik, and J. Spałek

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-29

Description: Author(s): M. Fidrysiak, M. Zegrodnik, and J. Spałek We consider the superconducting and Mott-insulating states for twisted bilayer graphene, modeled as a two-narrow-band system of electrons with appreciable intra-atomic Coulomb interactions. The interaction induces kinetic exchange which leads to real space, either triplet- or singlet-spin pairing, i... [Phys. Rev. B 98, 085436] Published Tue Aug 28, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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How to calculate the pole expansion of the optical scattering matrix from the resonant states (2018)

T. Weiss and E. A. Muljarov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-28

Description: Author(s): T. Weiss and E. A. Muljarov We present a formulation for the pole expansion of the scattering matrix of open optical resonators, in which the pole contributions are expressed solely in terms of the resonant states, their wave numbers, and their electromagnetic fields. Particularly, our approach provides an accurate description... [Phys. Rev. B 98, 085433] Published Mon Aug 27, 2018

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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