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Robustness of Majorana bound states in the short-junction limit (2017)

Doru Sticlet, Bas Nijholt, and Anton Akhmerov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-03-18

Description: Author(s): Doru Sticlet, Bas Nijholt, and Anton Akhmerov We study the effects of strong coupling between a superconductor and a semiconductor nanowire on the creation of the Majorana bound states, when the quasiparticle dwell time in the normal part of the nanowire is much shorter than the inverse superconducting gap. This “short-junction” limit is releva… [Phys. Rev. B 95, 115421] Published Fri Mar 17, 2017

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

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Quantum behavior of terahertz photoconductivity in silicon nanocrystals networks (2017)

V. Pushkarev, T. Ostatnický, H. Němec, T. Chlouba, F. Trojánek, P. Malý, M. Zacharias, S. Gutsch, D. Hiller, and P. Kužel

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-03-18

Description: Author(s): V. Pushkarev, T. Ostatnický, H. Němec, T. Chlouba, F. Trojánek, P. Malý, M. Zacharias, S. Gutsch, D. Hiller, and P. Kužel Quantum-size effects are essential for understanding the terahertz conductivity of semiconductor nanocrystals, particularly at low temperatures. We derived a quantum mechanical expression for the linear terahertz response of nanocrystals; its introduction into an appropriate effective medium model p… [Phys. Rev. B 95, 125424] Published Fri Mar 17, 2017

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Pseudomagnetic helicons (2017)

E. V. Gorbar, V. A. Miransky, I. A. Shovkovy, and P. O. Sukhachov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-03-21

Description: Author(s): E. V. Gorbar, V. A. Miransky, I. A. Shovkovy, and P. O. Sukhachov The existence of pseudomagnetic helicons is predicted for strained Dirac and Weyl materials. The corresponding collective modes are reminiscent of the usual helicons in metals in strong magnetic fields but can exist even without a magnetic field due to a strain-induced background pseudomagnetic fiel… [Phys. Rev. B 95, 115422] Published Mon Mar 20, 2017

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Two-body problem for two-dimensional electrons in the Bernervig-Hughes-Zhang model (2017)

Vladimir A. Sablikov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-02-14

Description: Author(s): Vladimir A. Sablikov We study the two-body problem for two-dimensional electron systems in a symmetrized Bernevig-Hughes-Zhang model, which is widely used to describe topological and conventional insulators. The main result is that two interacting electrons can form bound states with the energy in the gap of the band sp… [Phys. Rev. B 95, 085417] Published Fri Feb 10, 2017

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Spin-orbit and anisotropy effects in unoccupied bulk, surface, and image-potential states on W(110) (2017)

Henry Wortelen, Jürgen Henk, and Markus Donath

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-02-14

Description: Author(s): Henry Wortelen, Jürgen Henk, and Markus Donath We report on joint experimental and theoretical investigations of the unoccupied surface electronic structure of W(110). The spin-resolved inverse-photoemission experiments reveal a number of bands influenced by spin-orbit interaction and an image-potential state. The bands disperse differently with… [Phys. Rev. B 95, 085416] Published Thu Feb 09, 2017

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

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Formation of nanoripples on amorphous alumina thin films during low-energy ion-beam sputtering: Experiments and simulations (2017)

D. Babonneau, E. Vandenhecke, and S. Camelio

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-02-14

Description: Author(s): D. Babonneau, E. Vandenhecke, and S. Camelio The formation of nanopatterns induced by low-energy (0.5–1.5 keV) Xe + ion-beam sputtering of amorphous alumina thin films is investigated by atomic force microscopy and grazing incidence small-angle x-ray scattering. The observed dependence of the surface morphology on ion incidence angle, temperatu… [Phys. Rev. B 95, 085412] Published Thu Feb 09, 2017

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

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Direct observation of the band structure in bulk hexagonal boron nitride (2017)

Hugo Henck, Debora Pierucci, Giorgia Fugallo, José Avila, Guillaume Cassabois, Yannick J. Dappe, Mathieu G. Silly, Chaoyu Chen, Bernard Gil, Matteo Gatti, Francesco Sottile, Fausto Sirotti, Maria C. Asensio, and Abdelkarim Ouerghi

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-02-14

Description: Author(s): Hugo Henck, Debora Pierucci, Giorgia Fugallo, José Avila, Guillaume Cassabois, Yannick J. Dappe, Mathieu G. Silly, Chaoyu Chen, Bernard Gil, Matteo Gatti, Francesco Sottile, Fausto Sirotti, Maria C. Asensio, and Abdelkarim Ouerghi A promising route towards nanodevice applications relies on the association of graphene and transition metal dichalcogenides with hexagonal boron nitride ( h − BN ). Due to its insulating nature, h − BN has emerged as a natural substrate and gate dielectric for graphene-based electronic devices. However, … [Phys. Rev. B 95, 085410] Published Wed Feb 08, 2017

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

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All-electric spin pumping in quantum channels with a single finger-gate capacitor (2017)

L. Y. Wang and C. S. Chu

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-02-14

Description: Author(s): L. Y. Wang and C. S. Chu In this paper, we show that a single finger-gate capacitor (FGC) can generate pure spin pumping in a quantum channel (QC). Two dynamic fields, ac spin-orbit interaction and ac potential energy, both induced by the FGC onto the QC, are the agents driving the spin pumping. Smooth spatial profiles of t… [Phys. Rev. B 95, 075406] Published Tue Feb 07, 2017

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

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Measuring Majorana nonlocality and spin structure with a quantum dot (2017)

Elsa Prada, Ramón Aguado, and Pablo San-Jose

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-12

Description: Author(s): Elsa Prada, Ramón Aguado, and Pablo San-Jose Robust zero-bias transport anomalies in semiconducting nanowires with proximity-induced superconductivity have been convincingly demonstrated in various experiments. While these are compatible with the existence of Majorana zero modes at the ends of the nanowire, a direct proof of their nonlocality ... [Phys. Rev. B 96, 085418] Published Fri Aug 11, 2017

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

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Fano resonances in Majorana bound states–quantum dot hybrid systems (2017)

Alexander Schuray, Luzie Weithofer, and Patrik Recher

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-12

Description: Author(s): Alexander Schuray, Luzie Weithofer, and Patrik Recher We consider a quantum wire containing two Majorana bound states (MBS) at its ends that are tunnel-coupled to a current lead on one side and to a quantum dot (QD) on the other side. Using the method of full counting statistics we calculate the conductance and the zero-frequency noise. Using an effect... [Phys. Rev. B 96, 085417] Published Fri Aug 11, 2017

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

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Fate of the spin-$\frac{1}{2}$ Kondo effect in the presence of temperature gradients (2017)

Miguel A. Sierra, Rosa López, and David Sánchez

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-12

Description: Author(s): Miguel A. Sierra, Rosa López, and David Sánchez We consider a strongly interacting quantum dot connected to two leads held at quite different temperatures. Our aim is to study the behavior of the Kondo effect in the presence of large thermal biases. We use three different approaches, namely, a perturbation formalism based on the Kondo Hamiltonian... [Phys. Rev. B 96, 085416] Published Thu Aug 10, 2017

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

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First-principles investigation of transient spin transfer torque in magnetic multilayer systems (2017)

Zhizhou Yu, Lei Zhang, and Jian Wang

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-12

Description: Author(s): Zhizhou Yu, Lei Zhang, and Jian Wang By employing the nonequilibrium Green's function (NEGF) method, the transient current and the transient behavior of the spin transfer torque (STT) of the magnetic layered system are investigated within the framework of density functional theory (DFT). To reduce the huge computational cost of the tra... [Phys. Rev. B 96, 075412] Published Wed Aug 09, 2017

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

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Ag on a Ni vicinal surface: Coupling Stranski-Krastanov and “magic” heteroepitaxial growth (2017)

Amandine Bellec, Yves Garreau, Jérôme Creuze, Alina Vlad, Frederic Picca, Michèle Sauvage-Simkin, and Alessandro Coati

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-12

Description: Author(s): Amandine Bellec, Yves Garreau, Jérôme Creuze, Alina Vlad, Frederic Picca, Michèle Sauvage-Simkin, and Alessandro Coati Using vicinal surfaces as a template for heteroepitaxial growth offers a unique possibility to control the orientation and the crystallinity of the grown layer. The study presented here focuses on the growth of Ag on a carefully chosen Ni(11 9 9) substrate. Ag adopts a Stranski-Krastanov growth mode... [Phys. Rev. B 96, 085414] Published Wed Aug 09, 2017

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Quantum interference in coherent tunneling through branched molecular junctions containing ferrocene centers (2017)

Xin Zhao, Georg Kastlunger, and Robert Stadler

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-16

Description: Author(s): Xin Zhao, Georg Kastlunger, and Robert Stadler In our theoretical study where we combine a nonequilibrium Green's function approach with density functional theory we investigate branched compounds containing ferrocene moieties in both branches which, due to their metal centers, are designed to allow for asymmetry induced by local charging. In th... [Phys. Rev. B 96, 085421] Published Tue Aug 15, 2017

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Suppression of the Landau-Zener transition probability by weak classical noise (2017)

Rajesh K. Malla, E. G. Mishchenko, and M. E. Raikh

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-16

Description: Author(s): Rajesh K. Malla, E. G. Mishchenko, and M. E. Raikh When the drive, which causes the level crossing in a qubit, is slow, the probability P L Z of the Landau-Zener transition is close to 1. In this regime, which is most promising for applications, the noise due to the coupling to the environment reduces the average P L Z . At the same time, the survival pr... [Phys. Rev. B 96, 075419] Published Tue Aug 15, 2017

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Theoretical study of the charge transfer and electron emission in the scattering of ${\mathrm{He}}^{+}$ by an ${\mathrm{AlF}}_{3}$ surface (2017)

A. Iglesias-García, C. González, and E. C. Goldberg

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-23

Description: Author(s): A. Iglesias-García, C. González, and E. C. Goldberg Experimental results of electron emission from surfaces of aluminum fluoride impacted by keV noble gas ions ( He + , Ne + , Ar + ) show a high-energy structure that increases in intensity with ion energy in the case of He + and Ar + and is nearly independent on the impact energy for Ne + ions. It is also obse... [Phys. Rev. B 96, 075428] Published Mon Aug 21, 2017

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Germanene and stanene on two-dimensional substrates: Dirac cone and ${Z}_{2}$ invariant (2017)

Zeyuan Ni, Emi Minamitani, Yasunobu Ando, and Satoshi Watanabe

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-23

Description: Author(s): Zeyuan Ni, Emi Minamitani, Yasunobu Ando, and Satoshi Watanabe By using the combination of the ab initio density functional theory and data mining of the Inorganic Crystal Structure Database, a series of monolayer materials are found to be suitable substrates for germanene or stanene, including some of the Cd I 2 -type materials, CuI, and GaGeTe. All of the found ... [Phys. Rev. B 96, 075427] Published Mon Aug 21, 2017

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Line nodes, Dirac points, and Lifshitz transition in two-dimensional nonsymmorphic photonic crystals (2017)

Jun Yu Lin, Nai Chao Hu, You Jian Chen, Ching Hua Lee, and Xiao Zhang

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-29

Description: Author(s): Jun Yu Lin, Nai Chao Hu, You Jian Chen, Ching Hua Lee, and Xiao Zhang Topological phase transitions, which have fascinated generations of physicists, are always demarcated by gap closures. In this work, we propose very simple two-dimensional photonic crystal lattices with gap closures, i.e., band degeneracies protected by nonsymmorphic symmetry. Our photonic structure... [Phys. Rev. B 96, 075438] Published Mon Aug 28, 2017

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Vibronic coupling and band gap trends in ${\mathrm{CuGeO}}_{3}$ nanorods (2017)

Kenneth R. O'Neal, Amal al-Wahish, Zhaoqian Li, Peng Chen, Jae Wook Kim, Sang-Wook Cheong, Guy Dhalenne, Alexandre Revcolevschi, Xue-Tai Chen, and Janice L. Musfeldt

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-29

Description: Author(s): Kenneth R. O'Neal, Amal al-Wahish, Zhaoqian Li, Peng Chen, Jae Wook Kim, Sang-Wook Cheong, Guy Dhalenne, Alexandre Revcolevschi, Xue-Tai Chen, and Janice L. Musfeldt We measured the optical response of CuGeO 3 nanorods in order to reveal size effects on the electronic properties. The vibronically activated d -to- d color band excitations are activated by the 131 and 478 cm − 1 phonons, with the relative contribution of the lower frequency O-Cu-O bending mode increasi... [Phys. Rev. B 96, 075437] Published Mon Aug 28, 2017

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Plasmon canalization and tunneling over anisotropic metasurfaces (2017)

Diego Correas-Serrano, Andrea Alù, and J. Sebastian Gomez-Diaz

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-29

Description: Author(s): Diego Correas-Serrano, Andrea Alù, and J. Sebastian Gomez-Diaz We discuss the possibility of plasmon canalization, collimation, and tunneling over ultrathin metasurfaces, enabled by extreme anisotropy in their complex conductivity dyadic. The interplay between anisotropy, conductivity-near-zero, and loss is exploited here to derive general conditions for plasmo... [Phys. Rev. B 96, 075436] Published Mon Aug 28, 2017

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Energy loss and surface temperature effects in ab initio molecular dynamics simulations: N adsorption on Ag(111) as a case study (2017)

Dino Novko, Ivor Lončarić, María Blanco-Rey, J. Iñaki Juaristi, and Maite Alducin

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-29

Description: Author(s): Dino Novko, Ivor Lončarić, María Blanco-Rey, J. Iñaki Juaristi, and Maite Alducin We study surface temperature effects on the adsorption and relaxation of N atoms on Ag(111). To this aim, we perform ab initio molecular dynamics simulations with electronic friction, in which the surface is coupled to a thermostat that fixes the desired surface temperature. Simulations performed at... [Phys. Rev. B 96, 085437] Published Mon Aug 28, 2017

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Enhanced periodic modulation of electronic states in a hexagonal iron-nitride monolayer on Cu(001) via interfacial interaction (2017)

K. Ienaga, T. Miyamachi, Y. Takahashi, N. Kawamura, and F. Komori

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-29

Description: Author(s): K. Ienaga, T. Miyamachi, Y. Takahashi, N. Kawamura, and F. Komori Metal nitride has robust bonding between metal and nitrogen atoms. We have synthesized a monoatomic layer of a hexagonal-type iron nitride with strong Fe-N bond on the Cu(001) substrate with a fourfold lattice symmetry. From atomic-scale observation using scanning tunneling microscopy, we have found... [Phys. Rev. B 96, 085439] Published Mon Aug 28, 2017

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Perfect reflection control for impenetrable surfaces using surface waves of orthogonal polarization (2017)

Do-Hoon Kwon and Sergei A. Tretyakov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-29

Description: Author(s): Do-Hoon Kwon and Sergei A. Tretyakov For impenetrable electromagnetic surfaces, a metasurface design approach for perfect control of the reflection phenomena using gradient anisotropic tensor surface impedance is presented. It utilizes a set of orthogonally polarized auxiliary surface waves to create pointwise reactive impedance charac... [Phys. Rev. B 96, 085438] Published Mon Aug 28, 2017

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Pure dephasing of single Mn spin in semiconductor quantum dots (2017)

Dingyang Liu, Wenxi Lai, and Wen Yang

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-31

Description: Author(s): Dingyang Liu, Wenxi Lai, and Wen Yang We present comprehensive analytical and numerical studies on the pure dephasing of a single Mn spin in a semiconductor quantum dot due to (i) its sp-d exchange interaction with an electronic environment, and (ii) its hyperfine interaction with the nuclear spin environment. For (i), by modeling the e... [Phys. Rev. B 96, 075443] Published Wed Aug 30, 2017

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Anatomy of topological surface states: Exact solutions from destructive interference on frustrated lattices (2017)

Flore K. Kunst, Maximilian Trescher, and Emil J. Bergholtz

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-31

Description: Author(s): Flore K. Kunst, Maximilian Trescher, and Emil J. Bergholtz The hallmark of topological phases is their robust boundary signature whose intriguing properties—such as the one-way transport on the chiral edge of a Chern insulator and the sudden disappearance of surface states forming open Fermi arcs on the surfaces of Weyl semimetals—are impossible to realize ... [Phys. Rev. B 96, 085443] Published Wed Aug 30, 2017

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Effective mobility for sequential carrier transport in multiple quantum well structures (2017)

Kasidit Toprasertpong, Stephen M. Goodnick, Yoshiaki Nakano, and Masakazu Sugiyama

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-31

Description: Author(s): Kasidit Toprasertpong, Stephen M. Goodnick, Yoshiaki Nakano, and Masakazu Sugiyama We investigate a theoretical model for effective carrier mobility to comprehensively describe the behavior of the perpendicular carrier transport across multiple quantum well (MQW) structures under applied electric field. The analytical expressions of effective mobilities for thermionic emission, di... [Phys. Rev. B 96, 075441] Published Tue Aug 29, 2017

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Tight-binding model investigation of the biaxial strain induced topological phase transition in ${\mathrm{GeCH}}_{3}$ (2017)

Mohsen Rezaei, Esmaeil Taghizadeh Sisakht, Farhad Fazileh, Zahra Aslani, and F. M. Peeters

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-31

Description: Author(s): Mohsen Rezaei, Esmaeil Taghizadeh Sisakht, Farhad Fazileh, Zahra Aslani, and F. M. Peeters We propose a tight-binding (TB) model, that includes spin-orbit coupling (SOC), to describe the electronic properties of methyl-substituted germanane ( GeCH 3 ). This model gives an electronic spectrum in agreement with first principle results close to the Fermi level. Using the Z 2 formalism, we show t... [Phys. Rev. B 96, 085441] Published Tue Aug 29, 2017

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

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Thermoelectric properties of a ferromagnet-superconductor hybrid junction: Role of interfacial Rashba spin-orbit interaction (2017)

Paramita Dutta, Arijit Saha, and A. M. Jayannavar

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-09-06

Description: Author(s): Paramita Dutta, Arijit Saha, and A. M. Jayannavar We investigate thermoelectric properties of a ferromagnet-superconductor hybrid structure with Rashba spin-orbit interaction and delta function potential barrier at the interfacial layer. The exponential rise of thermal conductance with temperature manifests a crossover temperature scale separating ... [Phys. Rev. B 96, 115404] Published Tue Sep 05, 2017

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Unveiling subsurface hydrogen-bond structure of hexagonal water ice (2017)

Yuji Otsuki, Toshiki Sugimoto, Tatsuya Ishiyama, Akihiro Morita, Kazuya Watanabe, and Yoshiyasu Matsumoto

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-09-06

Description: Author(s): Yuji Otsuki, Toshiki Sugimoto, Tatsuya Ishiyama, Akihiro Morita, Kazuya Watanabe, and Yoshiyasu Matsumoto The phase-resolved sum-frequency-generation (SFG) spectrum for the basal face of hexagonal ice is reported and is interpreted by molecular dynamics simulations combined with ab initio quantum calculations. Here, we demonstrate that the line shape of the SFG spectra of isotope-diluted OH chromophores... [Phys. Rev. B 96, 115405] Published Tue Sep 05, 2017

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Understanding the photoemission distribution of strongly interacting two-dimensional overlayers (2017)

Daniel Lüftner, Simon Weiß, Xiaosheng Yang, Philipp Hurdax, Vitaliy Feyer, Alexander Gottwald, Georg Koller, Serguei Soubatch, Peter Puschnig, Michael G. Ramsey, and F. Stefan Tautz

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-09-06

Description: Author(s): Daniel Lüftner, Simon Weiß, Xiaosheng Yang, Philipp Hurdax, Vitaliy Feyer, Alexander Gottwald, Georg Koller, Serguei Soubatch, Peter Puschnig, Michael G. Ramsey, and F. Stefan Tautz Photoemission tomography (PT), the analysis of the photoemission intensity distribution within the plane wave final-state approximation, is being established as a useful tool for extracting the electronic and geometric structure of weakly interacting organic overlayers. Here we present a simple meth... [Phys. Rev. B 96, 125402] Published Tue Sep 05, 2017

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Spin-dependent electron-phonon coupling in the valence band of single-layer ${\mathrm{WS}}_{2}$ (2017)

Nicki Frank Hinsche, Arlette S. Ngankeu, Kevin Guilloy, Sanjoy K. Mahatha, Antonija Grubišić Čabo, Marco Bianchi, Maciej Dendzik, Charlotte E. Sanders, Jill A. Miwa, Harsh Bana, Elisabetta Travaglia, Paolo Lacovig, Luca Bignardi, Rosanna Larciprete, Alessandro Baraldi, Silvano Lizzit, Kristian Sommer Thygesen, and Philip Hofmann

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-09-06

Description: Author(s): Nicki Frank Hinsche, Arlette S. Ngankeu, Kevin Guilloy, Sanjoy K. Mahatha, Antonija Grubišić Čabo, Marco Bianchi, Maciej Dendzik, Charlotte E. Sanders, Jill A. Miwa, Harsh Bana, Elisabetta Travaglia, Paolo Lacovig, Luca Bignardi, Rosanna Larciprete, Alessandro Baraldi, Silvano Lizzit, Kristian Sommer Thygesen, and Philip Hofmann The absence of inversion symmetry leads to a strong spin-orbit splitting of the upper valence band of semiconducting single-layer transition-metal dichalchogenides such as MoS 2 or WS 2 . This permits a direct comparison of the electron-phonon coupling strength in states that only differ by their spin.... [Phys. Rev. B 96, 121402(R)] Published Tue Sep 05, 2017

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Nonlinear response of a MgZnO/ZnO heterostructure close to zero bias (2017)

Q. Shi, J. Falson, M. A. Zudov, Y. Kozuka, A. Tsukazaki, M. Kawasaki, and J. Smet

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-09-06

Description: Author(s): Q. Shi, J. Falson, M. A. Zudov, Y. Kozuka, A. Tsukazaki, M. Kawasaki, and J. Smet We report on magnetotransport properties of a MgZnO/ZnO heterostructure subjected to weak direct currents. We find that in the regime of overlapping Landau levels, the differential resistivity acquires a quantum correction proportional to both the square of the current and the Dingle factor. The ana... [Phys. Rev. B 96, 125401] Published Tue Sep 05, 2017

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Bayan Karimi and Jukka P. Pekola

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-09-06

Description: Author(s): Bayan Karimi and Jukka P. Pekola Two qubits form a quantum four-level system. The golden-rule based transition rates between these states are determined by the coupling of the qubits to noise sources. We demonstrate that depending on whether the noise acting on the two qubits is correlated or not, these transitions are governed by ... [Phys. Rev. B 96, 115408] Published Tue Sep 05, 2017

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Magnetic field effect on the lasing threshold of a semimagnetic polariton condensate (2017)

J.-G. Rousset, B. Piętka, M. Król, R. Mirek, K. Lekenta, J. Szczytko, W. Pacuski, and M. Nawrocki

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-09-06

Description: Author(s): J.-G. Rousset, B. Piętka, M. Król, R. Mirek, K. Lekenta, J. Szczytko, W. Pacuski, and M. Nawrocki We evidence magnetic field triggered polariton lasing in a microcavity containing semimagnetic quantum wells. This effect is associated with a decrease of the polariton lasing threshold power in magnetic field. The observed magnetic field dependence of the threshold power systematically exhibits a m... [Phys. Rev. B 96, 125403] Published Tue Sep 05, 2017

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Magnetotransport in heterostructures of transition metal dichalcogenides and graphene (2017)

Tobias Völkl, Tobias Rockinger, Martin Drienovsky, Kenji Watanabe, Takashi Taniguchi, Dieter Weiss, and Jonathan Eroms

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-09-07

Description: Author(s): Tobias Völkl, Tobias Rockinger, Martin Drienovsky, Kenji Watanabe, Takashi Taniguchi, Dieter Weiss, and Jonathan Eroms We use a van der Waals pickup technique to fabricate different heterostructures containing WSe 2 ( WS 2 ) and graphene. The heterostructures were structured by plasma etching, contacted by one-dimensional edge contacts, and a top gate was deposited. For graphene / WSe 2 / SiO 2 samples we observe mobilities of... [Phys. Rev. B 96, 125405] Published Wed Sep 06, 2017

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Type-II quantum-dot-in-nanowire structures with large oscillator strength for optical quantum gate applications (2017)

Masoomeh Taherkhani, Morten Willatzen, Jesper Mørk, Niels Gregersen, and Dara P. S. McCutcheon

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-09-08

Description: Author(s): Masoomeh Taherkhani, Morten Willatzen, Jesper Mørk, Niels Gregersen, and Dara P. S. McCutcheon We present a numerical investigation of the exciton energy and oscillator strength in type-II nanowire quantum dots. For a single quantum dot, the poor overlap of the electron part and the weakly confined hole part of the excitonic wave function leads to a low oscillator strength compared to type-I ... [Phys. Rev. B 96, 125408] Published Thu Sep 07, 2017

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Acoustic metasurfaces for scattering-free anomalous reflection and refraction (2017)

A. Díaz-Rubio and S. A. Tretyakov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-09-08

Description: Author(s): A. Díaz-Rubio and S. A. Tretyakov Manipulation of acoustic wave fronts by thin and planar devices, known as metasurfaces, has been extensively studied, in view of many important applications. Reflective and refractive metasurfaces are designed using the generalized reflection and Snell's laws, which tell that local phase shifts at t... [Phys. Rev. B 96, 125409] Published Thu Sep 07, 2017

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Magneto-optical transport properties of monolayer ${\mathrm{MoS}}_{2}$ on polar substrates (2017)

Chuong V. Nguyen, Nguyen N. Hieu, Nikolai A. Poklonski, Victor V. Ilyasov, Le Dinh, Tran C. Phong, Luong V. Tung, and Huynh V. Phuc

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-09-09

Description: Author(s): Chuong V. Nguyen, Nguyen N. Hieu, Nikolai A. Poklonski, Victor V. Ilyasov, Le Dinh, Tran C. Phong, Luong V. Tung, and Huynh V. Phuc We theoretically study the magneto-optical transport properties of monolayer molybdenum disulfide ( MoS 2 ) on polar substrates in the presence of a perpendicular magnetic field. The magneto-optical absorption coefficient (MOAC) is investigated as a function of the incident photon energy when carriers ... [Phys. Rev. B 96, 125411] Published Fri Sep 08, 2017

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Two-electron double quantum dot coupled to coherent photon and phonon fields (2017)

Yuya Sato, Jason C. H. Chen, Masayuki Hashisaka, Koji Muraki, and Toshimasa Fujisawa

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-09-12

Description: Author(s): Yuya Sato, Jason C. H. Chen, Masayuki Hashisaka, Koji Muraki, and Toshimasa Fujisawa Two-electron states of a double quantum dot (DQD) under irradiation of coherent boson (photon and phonon) fields are studied by measuring spin-flip tunneling current in the Pauli spin blockade regime. This measurement scheme allows us to investigate Rabi splitting and associated boson dressed states... [Phys. Rev. B 96, 115416] Published Mon Sep 11, 2017

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Spin-charge separation in an Aharonov-Bohm interferometer (2017)

A. P. Dmitriev, I. V. Gornyi, V. Yu. Kachorovskii, and D. G. Polyakov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-09-12

Description: Author(s): A. P. Dmitriev, I. V. Gornyi, V. Yu. Kachorovskii, and D. G. Polyakov We study manifestations of spin-charge separation (SCS) in transport through a tunnel-coupled interacting single-channel quantum ring. We focus on the high-temperature case (temperature T larger than the level spacing Δ ) and discuss both the classical (flux-independent) and interference contribution... [Phys. Rev. B 96, 115417] Published Mon Sep 11, 2017

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Revealing the spectral response of a plasmonic lens using low-energy electrons (2017)

Shuiyan Cao, Eric Le Moal, Florian Bigourdan, Jean-Paul Hugonin, Jean-Jacques Greffet, Aurélien Drezet, Serge Huant, Gérald Dujardin, and Elizabeth Boer-Duchemin

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-09-12

Description: Author(s): Shuiyan Cao, Eric Le Moal, Florian Bigourdan, Jean-Paul Hugonin, Jean-Jacques Greffet, Aurélien Drezet, Serge Huant, Gérald Dujardin, and Elizabeth Boer-Duchemin Plasmonic lenses, even of simple design, may have intricate spectral behavior. The spectral response of a plasmonic lens to a local, broadband excitation has rarely been studied despite its central importance in future applications. Here we use the unique combination of scanning tunneling microscopy... [Phys. Rev. B 96, 115419] Published Mon Sep 11, 2017

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Thermoelectric transport through a $\text{SU}(N)$ Kondo impurity (2017)

D. B. Karki and Mikhail N. Kiselev

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-09-12

Description: Author(s): D. B. Karki and Mikhail N. Kiselev We investigate thermoelectric transport through a SU ( N ) quantum impurity in the Kondo regime. The strong-coupling fixed-point theory is described by the local Fermi-liquid paradigm. Using Keldysh technique we analyze the electric current through the quantum impurity at both finite bias voltage and f... [Phys. Rev. B 96, 121403(R)] Published Mon Sep 11, 2017

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Direct observation of transverse and vortex metastable magnetic domains in cylindrical nanowires (2017)

C. Bran, J. A. Fernandez-Roldan, E. M. Palmero, E. Berganza, J. Guzman, R. P. del Real, A. Asenjo, A. Fraile Rodríguez, M. Foerster, L. Aballe, O. Chubykalo-Fesenko, and M. Vazquez

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-09-12

Description: Author(s): C. Bran, J. A. Fernandez-Roldan, E. M. Palmero, E. Berganza, J. Guzman, R. P. del Real, A. Asenjo, A. Fraile Rodríguez, M. Foerster, L. Aballe, O. Chubykalo-Fesenko, and M. Vazquez We present experimental evidence of transverse magnetic domains, previously observed only in nanostrips, in CoNi cylindrical nanowires with designed crystal symmetry and tailored magnetic anisotropy. The transverse domains are found together with more conventional vortex domains along the same cylin... [Phys. Rev. B 96, 125415] Published Mon Sep 11, 2017

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Topological invariants of band insulators derived from the local-orbital based embedding potential (2017)

H. Ishida, A. Liebsch, and D. Wortmann

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-09-12

Description: Author(s): H. Ishida, A. Liebsch, and D. Wortmann We demonstrate that topological invariants of band insulators can be derived efficiently from the eigenvalues of the local-orbital (LO) based embedding potential, called also the contact (lead) self-energy. The LO based embedding potential is a bulk quantity. Given the tight-binding Hamiltonian desc... [Phys. Rev. B 96, 125413] Published Mon Sep 11, 2017

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Analysis of the intermediate-band absorption properties of type-II GaSb/GaAs quantum-dot photovoltaics (2017)

I. Ramiro, J. Villa, C. Tablero, E. Antolín, A. Luque, A. Martí, J. Hwang, J. Phillips, A. J. Martin, and J. Millunchick

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-09-16

Description: Author(s): I. Ramiro, J. Villa, C. Tablero, E. Antolín, A. Luque, A. Martí, J. Hwang, J. Phillips, A. J. Martin, and J. Millunchick Quantum-dot (QD) intermediate-band (IB) materials are regarded as promising candidates for high-efficiency photovoltaics. The sequential two-step two-photon absorption processes that take place in these materials have been proposed to develop high-efficiency solar cells and infrared (IR) photodetect... [Phys. Rev. B 96, 125422] Published Fri Sep 15, 2017

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Uncovering nonperturbative dynamics of the biased sub-Ohmic spin-boson model with variational matrix product states (2017)

C. Gonzalez-Ballestero, Florian A. Y. N. Schröder, and Alex W. Chin

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-09-16

Description: Author(s): C. Gonzalez-Ballestero, Florian A. Y. N. Schröder, and Alex W. Chin We study the dynamics of the biased sub-Ohmic spin-boson model by means of a time-dependent variational matrix product state (TDVMPS) algorithm. The evolution of both the system and the environment is obtained in the weak- and the strong-coupling regimes, respectively characterized by damped spin os... [Phys. Rev. B 96, 115427] Published Fri Sep 15, 2017

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Determination of the adsorption geometry of PTCDA on the Cu(100) surface (2017)

Simon Weiß, Ina Krieger, Timo Heepenstrick, Serguei Soubatch, Moritz Sokolowski, and F. Stefan Tautz

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-12

Description: Author(s): Simon Weiß, Ina Krieger, Timo Heepenstrick, Serguei Soubatch, Moritz Sokolowski, and F. Stefan Tautz The adsorption geometry, namely the height and the site, of 3,4,9,10-perylene tetracarboxylic dianhydride (PTCDA) on the Cu(100) surface was determined by the normal incidence x-ray standing wave (NIXSW) technique including triangulation. The two PTCDA molecules in the superstructure unit cell, whic... [Phys. Rev. B 96, 075414] Published Thu Aug 10, 2017

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Tunable narrow-band near-field thermal emitters based on resonant metamaterials (2017)

Jiayu Li, Baoan Liu, and Sheng Shen

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-12

Description: Author(s): Jiayu Li, Baoan Liu, and Sheng Shen In the near field, Planck's law of blackbody radiation breaks down, and radiative heat transfer can be enhanced by orders of magnitude when surface polaritons are supported by interacting materials. However, such thermal radiation enhancement is strongly material dependent, thus difficult to control... [Phys. Rev. B 96, 075413] Published Thu Aug 10, 2017

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Analysis of STM images with pure and CO-functionalized tips: A first-principles and experimental study (2017)

Alexander Gustafsson, Norio Okabayashi, Angelo Peronio, Franz J. Giessibl, and Magnus Paulsson

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-12

Description: Author(s): Alexander Gustafsson, Norio Okabayashi, Angelo Peronio, Franz J. Giessibl, and Magnus Paulsson We describe a first-principles method to calculate scanning tunneling microscopy (STM) images, and compare the results to well-characterized experiments combining STM with atomic force microscopy (AFM). The theory is based on density functional theory with a localized basis set, where the wave funct... [Phys. Rev. B 96, 085415] Published Wed Aug 09, 2017

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Atomic force microscopy contrast with CO functionalized tips in hydrogen-bonded molecular layers: Does the real tip charge distribution play a role? (2017)

Michael Ellner, Pablo Pou, and Rubén Pérez

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-15

Description: Author(s): Michael Ellner, Pablo Pou, and Rubén Pérez The interplay of van der Waals (vdW), electrostatic (ES), and short-range (SR) interactions on both the intra- and intermolecular contrast observed in high-resolution atomic force microscopy (HR-AFM) is explored in a hydrogen-bonded monolayer of triazine molecules. Our efficient model to simulate AF... [Phys. Rev. B 96, 075418] Published Mon Aug 14, 2017

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Microscopic mechanism of the tunable band gap in potassium-doped few-layer black phosphorus (2017)

Sun-Woo Kim, Hyun Jung, Hyun-Jung Kim, Jin-Ho Choi, Su-Huai Wei, and Jun-Hyung Cho

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-15

Description: Author(s): Sun-Woo Kim, Hyun Jung, Hyun-Jung Kim, Jin-Ho Choi, Su-Huai Wei, and Jun-Hyung Cho Tuning band gaps in two-dimensional (2D) materials is of great interest for the fundamental and practical aspects of contemporary material sciences. Recently, black phosphorus (BP) consisting of stacked layers of phosphorene was experimentally observed to show a widely tunable band gap by means of t... [Phys. Rev. B 96, 075416] Published Mon Aug 14, 2017

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Short-time dynamics of molecular junctions after projective measurement (2017)

Gaomin Tang, Yanxia Xing, and Jian Wang

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-15

Description: Author(s): Gaomin Tang, Yanxia Xing, and Jian Wang In this work, we study the short-time dynamics of a molecular junction described by Anderson-Holstein model using full-counting statistics after projective measurement. The coupling between the central quantum dot (QD) and two leads was turned on at remote past and the system is evolved to steady st... [Phys. Rev. B 96, 075417] Published Mon Aug 14, 2017

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Experimental triple-slit interference in a strongly driven V-type artificial atom (2017)

Adetunmise C. Dada, Ted S. Santana, Antonios Koutroumanis, Yong Ma, Suk-In Park, Jindong Song, and Brian D. Gerardot

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-17

Description: Author(s): Adetunmise C. Dada, Ted S. Santana, Antonios Koutroumanis, Yong Ma, Suk-In Park, Jindong Song, and Brian D. Gerardot Rabi oscillations of a two-level atom appear as a quantum interference effect between the amplitudes associated with atomic superpositions, in analogy with the classic double-slit experiment which manifests a sinusoidal interference pattern. By extension, through direct detection of time-resolved re... [Phys. Rev. B 96, 081404(R)] Published Wed Aug 16, 2017

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Interacting mesoscopic capacitor out of equilibrium (2017)

Daniel Litinski, Piet W. Brouwer, and Michele Filippone

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-23

Description: Author(s): Daniel Litinski, Piet W. Brouwer, and Michele Filippone We consider the full nonequilibrium response of a mesoscopic capacitor in the large transparency limit, exactly solving a model with electron-electron interactions appropriate for a cavity in the quantum Hall regime. For a cavity coupled to the electron reservoir via an ideal point contact, we show ... [Phys. Rev. B 96, 085429] Published Mon Aug 21, 2017

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Interface defect-assisted phonon scattering of hot carriers in graphene (2017)

Sergey G. Menabde, Hyunwoo Cho, and Namkyoo Park

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-23

Description: Author(s): Sergey G. Menabde, Hyunwoo Cho, and Namkyoo Park The broadband and ultrafast photoresponse of graphene has been extensively studied in recent years, although the photoexcited carrier dynamics is still far from being completely understood. Different experimental approaches imply either one of two fundamentally different scattering mechanisms for ho... [Phys. Rev. B 96, 075426] Published Fri Aug 18, 2017

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Electronic correlation effects on the neutralization of ${\mathrm{Ga}}^{+}$ scattered by a gold surface (2017)

M. S. Tacca, F. Bonetto, and E. C. Goldberg

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-23

Description: Author(s): M. S. Tacca, F. Bonetto, and E. C. Goldberg The monotonous increasing with temperature behavior of the neutralization of Ga + scattered by a gold surface plus the nonmagnetic character of the ion induced to disregard the important electronic correlation effects. In this work, we show that contrary to this assumption, the electron-electron inte... [Phys. Rev. B 96, 075424] Published Thu Aug 17, 2017

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Spoof surface plasmons guided by narrow grooves (2017)

Ory Schnitzer

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-23

Description: Author(s): Ory Schnitzer An approximate description of surface waves propagating along periodically grooved surfaces is intuitively developed in the limit where the grooves are narrow relative to the period. Considering acoustic and electromagnetic waves guided by rigid and perfectly conducting gratings, respectively, the w... [Phys. Rev. B 96, 085424] Published Thu Aug 17, 2017

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Investigating ultraflexible freestanding graphene by scanning tunneling microscopy and spectroscopy (2017)

R. Breitwieser, Yu-Cheng Hu, Yen Cheng Chao, Yi Ren Tzeng, Shi Chian Liou, Keng Ching Lin, Chih Wei Chen, and Woei Wu Pai

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-25

Description: Author(s): R. Breitwieser, Yu-Cheng Hu, Yen Cheng Chao, Yi Ren Tzeng, Shi Chian Liou, Keng Ching Lin, Chih Wei Chen, and Woei Wu Pai A strictly two-dimensional (2D) material such as freestanding graphene (FSG) is rarely investigated at the atomic scale by scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS). A basic difficulty in probing FSG by STM and STS is the mechanical instability when a highly compl... [Phys. Rev. B 96, 085433] Published Thu Aug 24, 2017

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Dissipative transport of thermalized electrons through a nanodevice (2017)

M. Wołoszyn and B. J. Spisak

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-31

Description: Author(s): M. Wołoszyn and B. J. Spisak An equilibrium distribution function which corresponds to thermalization of electrons in contacts due to scattering processes is introduced for the purpose of reformulation of the inflow boundary conditions for the Wigner kinetic equation. The importance of the proposed concept for more realistic de... [Phys. Rev. B 96, 075440] Published Tue Aug 29, 2017

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Field-induced topological phase transition from a three-dimensional Weyl semimetal to a two-dimensional massive Dirac metal in $\mathrm{ZrT}{\mathrm{e}}_{5}$ (2017)

Guolin Zheng, Xiangde Zhu, Yequn Liu, Jianwei Lu, Wei Ning, Hongwei Zhang, Wenshuai Gao, Yuyan Han, Jiyong Yang, Haifeng Du, Kun Yang, Yuheng Zhang, and Mingliang Tian

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-09-02

Description: Author(s): Guolin Zheng, Xiangde Zhu, Yequn Liu, Jianwei Lu, Wei Ning, Hongwei Zhang, Wenshuai Gao, Yuyan Han, Jiyong Yang, Haifeng Du, Kun Yang, Yuheng Zhang, and Mingliang Tian Symmetry protected Dirac semimetals can be transformed into Weyl semimetals by breaking the protecting symmetry, leading to many exotic quantum phenomena such as chiral anomaly and anomalous Hall effect. Here we show that, due to the large Zeeman g factor and small bandwidth along the b axis in Dira... [Phys. Rev. B 96, 121401(R)] Published Fri Sep 01, 2017

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Edge capacitance of a two-dimensional topological insulator (2017)

M. V. Entin and L. Braginsky

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-09-02

Description: Author(s): M. V. Entin and L. Braginsky We study capacitance of the two-dimensional topological insulator (TI) edge states. The total capacitance is combined as a serial circuit of three capacitors presenting geometrical C G , quantum C Q , and correlation C corr contributions to the electron energy. If the Coulomb interaction is weak, they ob... [Phys. Rev. B 96, 115403] Published Fri Sep 01, 2017

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Magnetic states of linear defects in graphene monolayers: Effects of strain and interaction (2017)

Simone S. Alexandre and R. W. Nunes

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-09-02

Description: Author(s): Simone S. Alexandre and R. W. Nunes The combined effects of defect-defect interaction and strains of up to 10% on the onset of magnetic states in the quasi-one-dimensional electronic states generated by the so-called 558 linear defect in graphene monolayers are investigated by means of ab initio calculations. Results are analyzed on t... [Phys. Rev. B 96, 075445] Published Thu Aug 31, 2017

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Quantum capacitance of double-layer graphene (2017)

Fariborz Parhizgar, Alireza Qaiumzadeh, and Reza Asgari

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-09-02

Description: Author(s): Fariborz Parhizgar, Alireza Qaiumzadeh, and Reza Asgari We study the ground-state properties of a double-layer graphene system with the Coulomb interlayer electron-electron interaction modeled within the random-phase approximation. We first obtain an expression of the quantum capacitance of a two-layer system. In addition, we calculate the many-body exch... [Phys. Rev. B 96, 075447] Published Thu Aug 31, 2017

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Fingerprints of Majorana fermions in current-correlation measurements from a superconducting tunnel microscope (2017)

P. Devillard, D. Chevallier, and M. Albert

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-09-08

Description: Author(s): P. Devillard, D. Chevallier, and M. Albert We compute various current-correlation functions of electrons flowing from a topological nanowire to the tip of a superconducting scanning tunnel microscope and identify fingerprints of a Majorana bound state. In particular, the spin resolved cross correlations are shown to display a clear distincti... [Phys. Rev. B 96, 115413] Published Thu Sep 07, 2017

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Amplification of Cooper pair splitting current in a graphene-based Cooper pair beam splitter geometry (2017)

SK Firoz Islam and Arijit Saha

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-09-08

Description: Author(s): SK Firoz Islam and Arijit Saha Motivated by the recent experiments [ Scientific Reports 6 , 23051 (2016) ; Phys. Rev. Lett. 114 , 096602 (2015) ], we theoretically investigate Cooper pair splitting current in a graphene-based Cooper pair beam splitter geometry. By considering the graphene-based superconductor as an entangler device, i... [Phys. Rev. B 96, 125406] Published Thu Sep 07, 2017

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Thermoelectrics in Coulomb-coupled quantum dots: Cotunneling and energy-dependent lead couplings (2017)

Nicklas Walldorf, Antti-Pekka Jauho, and Kristen Kaasbjerg

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-09-09

Description: Author(s): Nicklas Walldorf, Antti-Pekka Jauho, and Kristen Kaasbjerg We study thermoelectric effects in Coulomb-coupled quantum-dot (CCQD) systems beyond lowest-order tunneling processes and the often applied wide-band approximation. To this end, we present a master-equation (ME) approach based on a perturbative T -matrix calculation of the charge and heat tunneling r... [Phys. Rev. B 96, 115415] Published Fri Sep 08, 2017

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Powerful Coulomb-drag thermoelectric engine (2017)

A.-M. Daré and P. Lombardo

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-09-09

Description: Author(s): A.-M. Daré and P. Lombardo We investigate a thermoelectric nanoengine whose properties are steered by Coulomb interaction. The device whose design decouples charge and energy currents is made up of two interacting quantum dots connected to three different reservoirs. We show that, by tailoring the tunnel couplings, this setup... [Phys. Rev. B 96, 115414] Published Fri Sep 08, 2017

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Light propagation in quasiperiodic dielectric multilayers separated by graphene (2017)

Carlos H. Costa, Luiz F. C. Pereira, and Claudionor G. Bezerra

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-09-09

Description: Author(s): Carlos H. Costa, Luiz F. C. Pereira, and Claudionor G. Bezerra The study of photonic crystals, artificial materials whose dielectric properties can be tailored according to the stacking of its constituents, remains an attractive research area. In this article we have employed a transfer matrix treatment to study the propagation of light waves in Fibonacci quasi... [Phys. Rev. B 96, 125412] Published Fri Sep 08, 2017

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Topological nodal points in two coupled Su-Schrieffer-Heeger chains (2017)

C. Li, S. Lin, G. Zhang, and Z. Song

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-09-13

Description: Author(s): C. Li, S. Lin, G. Zhang, and Z. Song We study a two coupled Su-Schrieffer-Heeger (SSH) chains system, which is shown to contain rich quantum phases associated with topological invariants protected by symmetries. In the weak coupling region, the system supports two nontrivial topological insulating phases, characterized by winding numbe... [Phys. Rev. B 96, 125418] Published Tue Sep 12, 2017

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Giant enhancement of the transverse magneto-optical Kerr effect through the coupling of $ɛ$-near-zero and surface plasmon polariton modes (2017)

J. A. Girón-Sedas, F. Reyes Gómez, Pablo Albella, J. R. Mejía-Salazar, and Osvaldo N. Oliveira, Jr.

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-12

Description: Author(s): J. A. Girón-Sedas, F. Reyes Gómez, Pablo Albella, J. R. Mejía-Salazar, and Osvaldo N. Oliveira, Jr. We demonstrate a concept for the giant enhancement of the transverse magneto-optical Kerr effect (TMOKE), with amplitudes reaching the maximum theoretical values of ± 1 . The concept exploits the strong electromagnetic field localization in ɛ -near-zero metamaterials to excite surface plasmon resonance... [Phys. Rev. B 96, 075415] Published Fri Aug 11, 2017

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Fano-shaped impurity spectral density, electric-field-induced in-gap state, and local magnetic moment of an adatom on trilayer graphene (2017)

Zu-Quan Zhang, Shuai Li, Jing-Tao Lü, and Jin-Hua Gao

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-12

Description: Author(s): Zu-Quan Zhang, Shuai Li, Jing-Tao Lü, and Jin-Hua Gao Recently, the existence of local magnetic moment in a hydrogen adatom on graphene was confirmed experimentally [González-Herrero et al. , Science 352 , 437 (2016) ]. Inspired by this breakthrough, we theoretically investigate the top-site adatom on trilayer graphene (TLG) by solving the Anderson impur... [Phys. Rev. B 96, 075410] Published Tue Aug 08, 2017

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Strong anisotropic optical conductivity in two-dimensional puckered structures: The role of the Rashba effect (2017)

S. Saberi-Pouya, T. Vazifehshenas, T. Salavati-fard, M. Farmanbar, and F. M. Peeters

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-12

Description: Author(s): S. Saberi-Pouya, T. Vazifehshenas, T. Salavati-fard, M. Farmanbar, and F. M. Peeters We calculate the optical conductivity of an anisotropic two-dimensional system with Rashba spin-flip excitation within the Kubo formalism. We show that the anisotropic Rashba effect caused by an external field significantly changes the magnitude of the spin splitting. Furthermore, we obtain an analy... [Phys. Rev. B 96, 075411] Published Tue Aug 08, 2017

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How nonlocal damping reduces plasmon-enhanced fluorescence in ultranarrow gaps (2017)

C. Tserkezis, N. Asger Mortensen, and Martijn Wubs

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-12

Description: Author(s): C. Tserkezis, N. Asger Mortensen, and Martijn Wubs The nonclassical modification of plasmon-assisted fluorescence enhancement is theoretically explored by placing two-level dipole emitters at the narrow gaps encountered in canonical plasmonic architectures, namely, dimers and trimers of different metallic nanoparticles. Through detailed simulations,... [Phys. Rev. B 96, 085413] Published Tue Aug 08, 2017

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Quantitative relationship between polarization differences and the zone-averaged shift photocurrent (2017)

Benjamin M. Fregoso, Takahiro Morimoto, and Joel E. Moore

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-17

Description: Author(s): Benjamin M. Fregoso, Takahiro Morimoto, and Joel E. Moore A relationship is derived between differences in electric polarization between bands and the “shift vector” that controls part of a material's bulk photocurrent, then demonstrated in several models. Electric polarization has a quantized gauge ambiguity and is normally observed at surfaces via the su... [Phys. Rev. B 96, 075421] Published Wed Aug 16, 2017

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Spaser quenching by off-resonant plasmon modes (2017)

L. S. Petrosyan and T. V. Shahbazyan

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-23

Description: Author(s): L. S. Petrosyan and T. V. Shahbazyan We study the effect of off-resonant plasmon modes on spaser threshold in nanoparticle-based spasers. We develop an analytical semiclassical model and derive spaser threshold condition accounting for gain coupling to higher-order plasmons. We show that such a coupling originates from inhomogeneity of... [Phys. Rev. B 96, 075423] Published Thu Aug 17, 2017

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Ab initio study of the electron energy loss function in a graphene-sapphire-graphene composite system (2017)

Vito Despoja, Tijana Djordjević, Lazar Karbunar, Ivan Radović, and Zoran L. Mišković

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-24

Description: Author(s): Vito Despoja, Tijana Djordjević, Lazar Karbunar, Ivan Radović, and Zoran L. Mišković The propagator of a dynamically screened Coulomb interaction W in a sandwichlike structure consisting of two graphene layers separated by a slab of Al 2 O 3 (or vacuum) is derived from single-layer graphene response functions and by using a local dielectric function for the bulk Al 2 O 3 . The response fun... [Phys. Rev. B 96, 075433] Published Wed Aug 23, 2017

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Effects of optical polarization on hybridization of radiative and evanescent field modes (2017)

Andrii Iurov, Danhong Huang, Godfrey Gumbs, Wei Pan, and A. A. Maradudin

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-24

Description: Author(s): Andrii Iurov, Danhong Huang, Godfrey Gumbs, Wei Pan, and A. A. Maradudin The effects of induced optical polarization by Dirac electrons in graphene on the hybridization of radiative and evanescent fields are found. Such effects result in a localized polarization field which significantly modifies an incident surface-plasmon-polariton (SPP) field. This yields a high sensi... [Phys. Rev. B 96, 081408(R)] Published Wed Aug 23, 2017

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Stacking in incommensurate graphene/hexagonal-boron-nitride heterostructures based on ab initio study of interlayer interaction (2017)

Alexander V. Lebedev, Irina V. Lebedeva, Andrey M. Popov, and Andrey A. Knizhnik

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-24

Description: Author(s): Alexander V. Lebedev, Irina V. Lebedeva, Andrey M. Popov, and Andrey A. Knizhnik The interlayer interaction in graphene/boron-nitride heterostructures is studied using density functional theory calculations with the correction for van der Waals interactions. It is shown that the use of the experimental interlayer distance allows one to describe the potential energy surface at th... [Phys. Rev. B 96, 085432] Published Wed Aug 23, 2017

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Diffusion quantum Monte Carlo study of excitonic complexes in two-dimensional transition-metal dichalcogenides (2017)

E. Mostaani, M. Szyniszewski, C. H. Price, R. Maezono, M. Danovich, R. J. Hunt, N. D. Drummond, and V. I. Fal'ko

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-24

Description: Author(s): E. Mostaani, M. Szyniszewski, C. H. Price, R. Maezono, M. Danovich, R. J. Hunt, N. D. Drummond, and V. I. Fal'ko Excitonic effects play a particularly important role in the optoelectronic behavior of two-dimensional semiconductors. To facilitate the interpretation of experimental photoabsorption and photoluminescence spectra we provide (i) statistically exact diffusion quantum Monte Carlo binding-energy data f... [Phys. Rev. B 96, 075431] Published Tue Aug 22, 2017

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

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Bloch-Grüneisen nonlinearity of electron transport in GaAs/AlGaAs heterostructures (2017)

O. E. Raichev, A. T. Hatke, M. A. Zudov, and J. L. Reno

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-24

Description: Author(s): O. E. Raichev, A. T. Hatke, M. A. Zudov, and J. L. Reno We report on nonlinear transport measurements in a two-dimensional electron gas hosted in GaAs/AlGaAs heterostructures. Upon application of direct current, the low-temperature differential resistivity acquires a positive correction, which exhibits a pronounced maximum followed by a plateau. With inc... [Phys. Rev. B 96, 081407(R)] Published Tue Aug 22, 2017

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

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Efficient anomalous reflection through near-field interactions in metasurfaces (2017)

H. Chalabi, Y. Ra'di, D. L. Sounas, and A. Alù

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-24

Description: Author(s): H. Chalabi, Y. Ra'di, D. L. Sounas, and A. Alù Gradient metasurfaces have been extensively used in the past few years for advanced wave manipulation over a thin surface. These metasurfaces have been mostly designed based on the generalized laws of reflection and refraction. However, it was recently revealed that metasurfaces based on this approa... [Phys. Rev. B 96, 075432] Published Tue Aug 22, 2017

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Three-quarter Dirac points, Landau levels, and magnetization in $α\text{−}{(\mathrm{BEDT}\text{−}\mathrm{TTF})}_{2}{\mathrm{I}}_{3}$ (2017)

Keita Kishigi and Yasumasa Hasegawa

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-24

Description: Author(s): Keita Kishigi and Yasumasa Hasegawa The energies as a function of the magnetic field ( H ) and the pressure are studied theoretically in the tight-binding model for the two-dimensional organic conductor α − ( BEDT − TTF ) 2 I 3 , in which massless Dirac fermions are realized. The effects of the uniaxial pressure ( P ) are studied by using the press... [Phys. Rev. B 96, 085430] Published Tue Aug 22, 2017

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Microscopic understanding of the photoconduction effect in graphene (2017)

Roland Jago, Florian Wendler, and Ermin Malic

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-24

Description: Author(s): Roland Jago, Florian Wendler, and Ermin Malic We investigate the photoresponse of intrinsic graphene in an in-plane electric field. Toward that end, we employ a microscopic approach that allows us to determine the time- and momentum-resolved charge-carrier distributions as a result of the interplay between the field-induced acceleration of opti... [Phys. Rev. B 96, 085431] Published Tue Aug 22, 2017

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Parity breaking in a double atomic chain system (2017)

J. Aulbach, S. C. Erwin, J. Kemmer, M. Bode, J. Schäfer, and R. Claessen

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-24

Description: Author(s): J. Aulbach, S. C. Erwin, J. Kemmer, M. Bode, J. Schäfer, and R. Claessen In one-dimensional electron systems, cooperative effects are expected to cause very specific electronic instabilities. Atomic nanowires, formed via self-organized growth on semiconductor surfaces, represent viable physical realizations for the study of such fascinating one-dimensional quantum states. The system in the focus of this work, Si(553)-Au, is created by Au adsorption on a stepped silicon substrate. It features two different chain types, interspersed with each other: Au chains on the terraces, and Si step edges that are subject to the formation of spin chains. By combining high-resolution scanning tunneling microscopy and local tunneling spectroscopy, the authors reveal the complex interplay between the two distinct wire architectures. The interaction is effectively “one-way” in that the Si step edges respond to the Au chains, but not vice versa. As a consequence, the symmetry of the system is lowered as the parity of the Si chains is broken. This fundamental effect creates two different configurations of chains with opposite directionality. [Phys. Rev. B 96, 081406(R)] Published Tue Aug 22, 2017

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

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Effect of long-range structural corrugations on magnetotransport properties of phosphorene in tilted magnetic field (2017)

A. Mogulkoc, M. Modarresi, and A. N. Rudenko

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-25

Description: Author(s): A. Mogulkoc, M. Modarresi, and A. N. Rudenko Rippling is an inherent quality of two-dimensional materials playing an important role in determining their properties. Here, we study the effect of structural corrugations on the electronic and transport properties of monolayer black phosphorus (phosphorene) in the presence of tilted magnetic field... [Phys. Rev. B 96, 085434] Published Thu Aug 24, 2017

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Quantum phase fluctuations and density of states in superconducting nanowires (2017)

Alexey Radkevich, Andrew G. Semenov, and Andrei D. Zaikin

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-26

Description: Author(s): Alexey Radkevich, Andrew G. Semenov, and Andrei D. Zaikin We argue that quantum fluctuations of the phase of the order parameter may strongly affect the electron density of states (DOS) in ultrathin superconducting wires. We demonstrate that the effect of such fluctuations is equivalent to that of a quantum dissipative environment formed by soundlike plasm... [Phys. Rev. B 96, 085435] Published Fri Aug 25, 2017

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Cooling of chiral heat transport in the quantum Hall effect regime of graphene (2017)

Sergey Slizovskiy and Vladimir Fal'ko

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-29

Description: Author(s): Sergey Slizovskiy and Vladimir Fal'ko In the quantum Hall effect (QHE) regime, heat is carried by electrons in the edge states of Landau levels. Here, we study cooling of hot electrons propagating along the edge of graphene at the filling factor ν = ± 2 , mediated by acoustic phonons. We determine the temperature profile extended from a hot... [Phys. Rev. B 96, 075434] Published Mon Aug 28, 2017

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

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Manifestation of a Fermi edge singularity in the cotunneling regime (2017)

Artem Borin and Eugene Sukhorukov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-29

Description: Author(s): Artem Borin and Eugene Sukhorukov The Fermi edge singularity (FES) is a prominent manifestation of the Coulomb interaction. It can be observed in a controllable way by studying the transport through a quantum dot (QD), which is electrostatically coupled to the leads. In this paper, we study how FES affects higher-order tunneling pro... [Phys. Rev. B 96, 075435] Published Mon Aug 28, 2017

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

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Spin and electric currents induced by a spin-motive force in two-dimensional Dirac semimetals protected by nonsymmorphic symmetries (2017)

Tetsuro Habe

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-31

Description: Author(s): Tetsuro Habe We theoretically study the spin and charge currents induced by a spin-motive force in a two-dimensional Dirac semimetal protected by nonsymmorphic symmetries. Glide mirror plane symmetry, a nonsymmorphic symmetry, leads to a constraint to the induced current; the spin-motive force acting on out-of-p... [Phys. Rev. B 96, 085440] Published Tue Aug 29, 2017

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Magnetic field driven ambipolar quantum Hall effect in epitaxial graphene close to the charge neutrality point (2017)

A. Nachawaty, M. Yang, W. Desrat, S. Nanot, B. Jabakhanji, D. Kazazis, R. Yakimova, A. Cresti, W. Escoffier, and B. Jouault

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-31

Description: Author(s): A. Nachawaty, M. Yang, W. Desrat, S. Nanot, B. Jabakhanji, D. Kazazis, R. Yakimova, A. Cresti, W. Escoffier, and B. Jouault We have investigated the disorder of epitaxial graphene close to the charge neutrality point (CNP) by various methods: (i) at room temperature, by analyzing the dependence of the resistivity on the Hall coefficient; (ii) by fitting the temperature dependence of the Hall coefficient down to liquid he... [Phys. Rev. B 96, 075442] Published Wed Aug 30, 2017

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Large optical conductivity of Dirac semimetal Fermi arc surface states (2017)

Li-kun Shi and Justin C. W. Song

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-08-31

Description: Author(s): Li-kun Shi and Justin C. W. Song Fermi arc surface states, a hallmark of topological Dirac semimetals, can host carriers that exhibit unusual dynamics distinct from that of their parent bulk. Here we find that Fermi arc carriers in intrinsic Dirac semimetals possess a strong and anisotropic light-matter interaction. This is charact... [Phys. Rev. B 96, 081410(R)] Published Wed Aug 30, 2017

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Effect of roughness on the layer-dependent friction of few-layer graphene (2017)

Zhijiang Ye, Arda Balkanci, Ashlie Martini, and Mehmet Z. Baykara

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-09-02

Description: Author(s): Zhijiang Ye, Arda Balkanci, Ashlie Martini, and Mehmet Z. Baykara Friction on few-layer graphene is known to exhibit unique layer dependence where friction measured via atomic force microscopy (AFM) on the nanometer scale is generally observed to decrease with increasing number of layers. However, this trend is not always observed for AFM probe tips with different... [Phys. Rev. B 96, 115401] Published Fri Sep 01, 2017

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Anisotropic hybrid excitation modes in monolayer and double-layer phosphorene on polar substrates (2017)

S. Saberi-Pouya, T. Vazifehshenas, T. Salavati-fard, and M. Farmanbar

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-09-02

Description: Author(s): S. Saberi-Pouya, T. Vazifehshenas, T. Salavati-fard, and M. Farmanbar We investigate the anisotropic hybrid surface optical (SO) phonon-plasmon dispersion relations in monolayer and double-layer phosphorene systems located on the polar substrates, such as SiO 2 , h -BN, and Al 2 O 3 . We calculate these hybrid modes by using the dynamical dielectric function in the random ph... [Phys. Rev. B 96, 115402] Published Fri Sep 01, 2017

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Density functional perturbation theory for gated two-dimensional heterostructures: Theoretical developments and application to flexural phonons in graphene (2017)

Thibault Sohier, Matteo Calandra, and Francesco Mauri

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-09-02

Description: Author(s): Thibault Sohier, Matteo Calandra, and Francesco Mauri In the search for exciting new physics and the design of next-generation devices, gated two-dimensional heterostructures are becoming omnipresent. As the fabrication and characterization techniques in this field improve, first-principles methods must follow suit. The authors present here an implementation of density functional perturbation theory, tailored to simulate the electronic and vibrational properties of two-dimensional heterostructures in the field-effect configuration. They apply the method to gated graphene and show that while the field effect activates the coupling between electrons and flexural phonons, this coupling is strongly screened by the electrons of doped graphene. [Phys. Rev. B 96, 075448] Published Thu Aug 31, 2017

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Full counting statistics of conductance for disordered systems (2017)

Bin Fu, Lei Zhang, Yadong Wei, and Jian Wang

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-09-08

Description: Author(s): Bin Fu, Lei Zhang, Yadong Wei, and Jian Wang Quantum transport is a stochastic process in nature. As a result, the conductance is fully characterized by its average value and fluctuations, i.e., characterized by full counting statistics (FCS). Since disorders are inevitable in nanoelectronic devices, it is important to understand how FCS behav... [Phys. Rev. B 96, 115410] Published Thu Sep 07, 2017

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Influence of oxygen partial pressure on the adsorption and diffusion during oxide growth: ZnO(0001) surface (2017)

Qiyuan Ruan, Jingchen Ye, Da-Jun Shu, and Mu Wang

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-09-08

Description: Author(s): Qiyuan Ruan, Jingchen Ye, Da-Jun Shu, and Mu Wang Oxygen partial pressure during vapor phase growth plays a critical role in determining the microstructure and other properties of oxides. However, it remains unclear how it affects the growth mechanism on the atomic scale. In this article, we take ZnO(0001) surface as a model case and demonstrate th... [Phys. Rev. B 96, 115412] Published Thu Sep 07, 2017

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Tunable wideband-directive thermal emission from SiC surface using bundled graphene sheets (2017)

Sandeep Inampudi and Hossein Mosallaei

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-09-08

Description: Author(s): Sandeep Inampudi and Hossein Mosallaei Coherent thermal radiation emitters based on diffraction gratings inscribed on surface of a polar material, such as silicon carbide, always possess high angular dispersion resulting in wideband-dispersive or monochromatic-directive emission. In this paper, we identify roots of the high angular dispe... [Phys. Rev. B 96, 125407] Published Thu Sep 07, 2017

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Wigner-function formalism applied to semiconductor quantum devices: Need for nonlocal scattering models (2017)

Rita Claudia Iotti, Fabrizio Dolcini, and Fausto Rossi

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-09-13

Description: Author(s): Rita Claudia Iotti, Fabrizio Dolcini, and Fausto Rossi In designing and optimizing new-generation nanomaterials and related quantum devices, dissipation versus decoherence phenomena are often accounted for via local scattering models, such as relaxation-time and Boltzmann-like schemes. Here we show that the use of such local scattering approaches within... [Phys. Rev. B 96, 115420] Published Tue Sep 12, 2017

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

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Plasmons in graphene nanoribbons (2017)

F. Karimi and I. Knezevic

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-09-13

Description: Author(s): F. Karimi and I. Knezevic We calculate the dielectric function and plasmonic response of armchair (aGNRs) and zigzag (zGNRs) graphene nanoribbons using the self-consistent-field approach within the Markovian master equation formalism (SCF-MMEF). We accurately account for electron scattering with phonons, ionized impurities, ... [Phys. Rev. B 96, 125417] Published Tue Sep 12, 2017

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Quench action and Rényi entropies in integrable systems (2017)

Vincenzo Alba and Pasquale Calabrese

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2017-09-14

Description: Author(s): Vincenzo Alba and Pasquale Calabrese Entropy is a fundamental concept in equilibrium statistical mechanics, yet its origin in the nonequilibrium dynamics of isolated quantum systems is not fully understood. A strong consensus is emerging around the idea that the stationary thermodynamic entropy is the von Neumann entanglement entropy o... [Phys. Rev. B 96, 115421] Published Wed Sep 13, 2017

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