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Properties of dirty two-band superconductors with repulsive interband interaction: Normal modes, length scales, vortices, and magnetic response (2018)

Julien Garaud, Alberto Corticelli, Mihail Silaev, and Egor Babaev

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-07-26

Description: Author(s): Julien Garaud, Alberto Corticelli, Mihail Silaev, and Egor Babaev Disorder in two-band superconductors with repulsive interband interaction induces a frustrated competition between the phase-locking preferences of the various potential and kinetic terms. This frustrated interaction can result in the formation of an s + i s superconducting state that breaks the time-r... [Phys. Rev. B 98, 014520] Published Wed Jul 25, 2018

Keywords: Superfluidity and superconductivity

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Criterion for quantum Zeno and anti-Zeno effects (2018)

Jia-Ming Zhang, Jun Jing, Li-Gang Wang, and Shi-Yao Zhu

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-07-27

Description: Author(s): Jia-Ming Zhang, Jun Jing, Li-Gang Wang, and Shi-Yao Zhu In this work, we study the decay behavior of a two-level system under the competing influence of a dissipative environment and repetitive measurements. The sign of the second derivative of the environmental spectral density function with respect to the system transition frequency is found to be a su... [Phys. Rev. A 98, 012135] Published Thu Jul 26, 2018

Keywords: Fundamental concepts

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Enhanced quasiparticle lifetime in a superconductor by selective blocking of recombination phonons with a phononic crystal (2018)

K. Rostem, P. J. de Visser, and E. J. Wollack

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-07-28

Description: Author(s): K. Rostem, P. J. de Visser, and E. J. Wollack When quasiparticles in a BCS superconductor recombine into Cooper pairs, phonons are emitted within a narrow band of energies above the pairing energy at 2 Δ . We show that a phonon band gap restricting the escape of recombination phonons from a superconductor can increase the quasiparticle recombinat... [Phys. Rev. B 98, 014522] Published Fri Jul 27, 2018

Keywords: Superfluidity and superconductivity

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Spin-orbit-coupled ferroelectric superconductivity (2018)

Shota Kanasugi and Youichi Yanase

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-07-28

Description: Author(s): Shota Kanasugi and Youichi Yanase Motivated by recent studies on ferroelectriclike order coexisting with metallicity, we investigate ferroelectric (FE) superconductivity in which a FE-like structural phase transition occurs in the superconducting state. We consider a two-dimensional s -wave superconductor with Rashba-type antisymmetr... [Phys. Rev. B 98, 024521] Published Fri Jul 27, 2018

Keywords: Superfluidity and superconductivity

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System-environment correlations and Markovian embedding of quantum non-Markovian dynamics (2018)

Steve Campbell, Francesco Ciccarello, G. Massimo Palma, and Bassano Vacchini

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-07-31

Description: Author(s): Steve Campbell, Francesco Ciccarello, G. Massimo Palma, and Bassano Vacchini We study the dynamics of a quantum system whose interaction with an environment is described by a collision model, i.e., the open dynamics is modeled through sequences of unitary interactions between the system and the individual constituents of the environment, termed “ancillas,” which are subseque... [Phys. Rev. A 98, 012142] Published Mon Jul 30, 2018

Keywords: Fundamental concepts

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Spatial distribution of superfluidity and superfluid distillation of Bose liquids (2018)

T. J. Volkoff and Yongkyung Kwon

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-07-26

Description: Author(s): T. J. Volkoff and Yongkyung Kwon Under the assumption of two-fluid kinematics of a nonrelativistic Bose liquid in the presence of a local velocity field v ( x ) , local Galilei transformations are used to derive formulas for the spatial distribution of superfluidity. The local formulation is shown to subsume several descriptions of sup... [Phys. Rev. B 98, 014519] Published Wed Jul 25, 2018

Keywords: Superfluidity and superconductivity

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Soft phonons reveal the nematic correlation length in $\mathrm{Ba}{({\mathrm{Fe}}_{0.94}{\mathrm{Co}}_{0.06})}_{2}{\mathrm{As}}_{2}$ (2018)

F. Weber, D. Parshall, L. Pintschovius, J.-P. Castellan, M. Kauth, M. Merz, Th. Wolf, M. Schütt, J. Schmalian, R. M. Fernandes, and D. Reznik

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-07-25

Description: Author(s): F. Weber, D. Parshall, L. Pintschovius, J.-P. Castellan, M. Kauth, M. Merz, Th. Wolf, M. Schütt, J. Schmalian, R. M. Fernandes, and D. Reznik Nematicity is ubiquitous in electronic phases of high- T c superconductors, particularly in the Fe-based systems. While several experiments have probed nematic fluctuations, they have been restricted to uniform or momentum-averaged fluctuations. Here, we investigate the behavior of finite-momentum nem... [Phys. Rev. B 98, 014516] Published Tue Jul 24, 2018

Keywords: Superfluidity and superconductivity

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Resolving different pairing states in Weyl superconductors through the single-particle spectrum (2018)

Tao Zhou, Yi Gao, and Z. D. Wang

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-07-25

Description: Author(s): Tao Zhou, Yi Gao, and Z. D. Wang We study theoretically single-particle spectra of Weyl superconductors. Three different superconducting pairing states are addressed, which are the BCS-type states with the s -wave pairing symmetry and the p + i p -wave pairing symmetry, and the FFLO pairing state. We elaborate that these three states ca... [Phys. Rev. B 98, 024515] Published Tue Jul 24, 2018

Keywords: Superfluidity and superconductivity

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Light-induced new collective modes in the superconductor ${\mathrm{La}}_{1.905}{\mathrm{Ba}}_{0.095}{\mathrm{CuO}}_{4}$ (2018)

S. J. Zhang, Z. X. Wang, L. Y. Shi, T. Lin, M. Y. Zhang, G. D. Gu, T. Dong, and N. L. Wang

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-07-25

Description: Author(s): S. J. Zhang, Z. X. Wang, L. Y. Shi, T. Lin, M. Y. Zhang, G. D. Gu, T. Dong, and N. L. Wang We report near and midinfrared pump, c -axis terahertz probe measurements on a superconducting single crystal La 1.905 Ba 0.095 CuO 4 with T c = 32 K. The measurements reveal that the pump-induced change occurs predominantly at the Josephson plasma edge position below T c . Upon excitation by strong near-infra... [Phys. Rev. B 98, 020506(R)] Published Tue Jul 24, 2018

Keywords: Superfluidity and superconductivity

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Suppression of the magnetic order in CeFeAsO: Nonequivalence of hydrostatic and in-plane chemical pressure (2018)

Philipp Materne, Wenli Bi, Esen Ercan Alp, Jiyong Zhao, Michael Yu Hu, Anton Jesche, Christoph Geibel, Rhea Kappenberger, Saicharan Aswartham, Sabine Wurmehl, Bernd Büchner, Dongzhou Zhang, Til Goltz, Johannes Spehling, and Hans-Henning Klauss

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-07-25

Description: Author(s): Philipp Materne, Wenli Bi, Esen Ercan Alp, Jiyong Zhao, Michael Yu Hu, Anton Jesche, Christoph Geibel, Rhea Kappenberger, Saicharan Aswartham, Sabine Wurmehl, Bernd Büchner, Dongzhou Zhang, Til Goltz, Johannes Spehling, and Hans-Henning Klauss We present a detailed investigation of the electronic properties of CeFeAsO under in-plane chemical (As by P substitution) and hydrostatic pressure by means of in-house and synchrotron Mössbauer spectroscopy. The Fe magnetism is suppressed due to both pressures and no magnetic order was observed abo... [Phys. Rev. B 98, 014517] Published Tue Jul 24, 2018

Keywords: Superfluidity and superconductivity

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No-signaling principle and quantum brachistochrone problem in $\mathcal{PT}$-symmetric fermionic two- and four-dimensional models (2018)

Alireza Beygi and S. P. Klevansky

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-08-04

Description: Author(s): Alireza Beygi and S. P. Klevansky Fermionic systems differ from bosonic ones in several ways, in particular the time-reversal operator T is odd, T 2 = − 1 . For PT -symmetric bosonic systems, the no-signaling principle and the quantum brachistochrone problem have been studied to some degree, both of them controversially. In this paper, we... [Phys. Rev. A 98, 022105] Published Fri Aug 03, 2018

Keywords: Fundamental concepts

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Quantum walks assisted by particle-number fluctuations (2018)

R. A. Vargas–Hernández and R. V. Krems

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-08-04

Description: Author(s): R. A. Vargas–Hernández and R. V. Krems We study the spreading of a quantum particle placed in a single site of a lattice or binary tree with the Hamiltonian permitting particle-number changes. We show that the particle-number-changing interactions accelerate the spreading beyond the ballistic expansion limit by inducing off-resonant Rabi... [Phys. Rev. A 98, 022107] Published Fri Aug 03, 2018

Keywords: Fundamental concepts

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Paradoxical consequences of multipath coherence: Perfect interaction-free measurements (2018)

Z. Zhao, S. Mondal, M. Markiewicz, A. Rutkowski, B. Dakić, W. Laskowski, and T. Paterek

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-08-07

Description: Author(s): Z. Zhao, S. Mondal, M. Markiewicz, A. Rutkowski, B. Dakić, W. Laskowski, and T. Paterek Quantum coherence can be used to infer the presence of a detector without triggering it. Here we point out that, according to quantum mechanics, such interaction-free measurements cannot be perfect, i.e., in a single-shot experiment one has strictly positive probability to activate the detector. We ... [Phys. Rev. A 98, 022108] Published Mon Aug 06, 2018

Keywords: Fundamental concepts

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Uncovering the nonequilibrium phase structure of an open quantum spin system (2018)

S. Helmrich, A. Arias, and S. Whitlock

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-08-07

Description: Author(s): S. Helmrich, A. Arias, and S. Whitlock We experimentally and theoretically investigate the nonequilibrium phase structure of a well-controlled driven-dissipative quantum spin system governed by the interplay of coherent driving, spontaneous decay, and long-range spin-spin interactions. We discover that the rate of population loss provide... [Phys. Rev. A 98, 022109] Published Mon Aug 06, 2018

Keywords: Fundamental concepts

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Josephson-effect diagnostic of competing orders in quantum critical multiband superconductors (2018)

Maxim Dzero and Alex Levchenko

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-07

Description: Author(s): Maxim Dzero and Alex Levchenko Motivated by the recent experimentally observed manifestations of the quantum critical point fluctuations in the thermodynamic properties of multiband superconductors, we derive a general expression for the Josephson current of various junctions between two superconductors in the phase of supercondu... [Phys. Rev. B 98, 054501] Published Mon Aug 06, 2018

Keywords: Superfluidity and superconductivity

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Magnetic tricritical point and nematicity in FeSe under pressure (2018)

Rustem Khasanov, Rafael M. Fernandes, Gediminas Simutis, Zurab Guguchia, Alex Amato, Hubertus Luetkens, Elvezio Morenzoni, Xiaoli Dong, Fang Zhou, and Zhongxian Zhao

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-06-14

Description: Author(s): Rustem Khasanov, Rafael M. Fernandes, Gediminas Simutis, Zurab Guguchia, Alex Amato, Hubertus Luetkens, Elvezio Morenzoni, Xiaoli Dong, Fang Zhou, and Zhongxian Zhao Magnetism induced by external pressure ( p ) was studied in a FeSe crystal sample by means of muon-spin rotation. The magnetic transition changes from second order to first order for pressures exceeding the critical value p c ≃ 2.4 – 2.5 GPa. The magnetic ordering temperature ( T N ) and the value of the magn... [Phys. Rev. B 97, 224510] Published Wed Jun 13, 2018

Keywords: Superfluidity and superconductivity

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All the noncontextuality inequalities for arbitrary prepare-and-measure experiments with respect to any fixed set of operational equivalences (2018)

David Schmid, Robert W. Spekkens, and Elie Wolfe

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-06-06

Description: Author(s): David Schmid, Robert W. Spekkens, and Elie Wolfe Within the framework of generalized noncontextuality, we introduce a general technique for systematically deriving noncontextuality inequalities for any experiment involving finitely many preparations and finitely many measurements, each of which has a finite number of outcomes. Given any fixed sets... [Phys. Rev. A 97, 062103] Published Tue Jun 05, 2018

Keywords: Fundamental concepts

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Spin-imbalanced pairing and Fermi surface deformation in flat bands (2018)

Kukka-Emilia Huhtinen, Marek Tylutki, Pramod Kumar, Tuomas I. Vanhala, Sebastiano Peotta, and Päivi Törmä

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-06-06

Description: Author(s): Kukka-Emilia Huhtinen, Marek Tylutki, Pramod Kumar, Tuomas I. Vanhala, Sebastiano Peotta, and Päivi Törmä We study the attractive Hubbard model with spin imbalance on two lattices featuring a flat band: the Lieb and kagome lattices. We present mean-field phase diagrams featuring exotic superfluid phases, similar to the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state, whose stability is confirmed by dynami... [Phys. Rev. B 97, 214503] Published Tue Jun 05, 2018

Keywords: Superfluidity and superconductivity

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Distinguishing topological Majorana bound states from trivial Andreev bound states: Proposed tests through differential tunneling conductance spectroscopy (2018)

Chun-Xiao Liu, Jay D. Sau, and S. Das Sarma

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-06-06

Description: Author(s): Chun-Xiao Liu, Jay D. Sau, and S. Das Sarma Trivial Andreev bound states arising from chemical-potential variations could lead to zero-bias tunneling conductance peaks at finite magnetic field in class-D nanowires, precisely mimicking the predicted zero-bias conductance peaks arising from the topological Majorana bound states. This finding ra... [Phys. Rev. B 97, 214502] Published Tue Jun 05, 2018

Keywords: Superfluidity and superconductivity

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Thermoelectric anisotropy in the iron-based superconductor $\mathrm{Ba}{({\mathrm{Fe}}_{1−x}{\mathrm{Co}}_{x})}_{2}{\mathrm{As}}_{2}$ (2018)

Marcin Matusiak, Krzysztof Rogacki, and Thomas Wolf

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-06-06

Description: Author(s): Marcin Matusiak, Krzysztof Rogacki, and Thomas Wolf Nematicity turns out to be a surprisingly common form of self-organization in strongly correlated electronic systems. Its presence along with superconductivity raises the question about a mutual relation between these two types of electronic order as well as about mechanisms that leads to their formation. Here, the authors show that the in-plane anisotropy of the Nernst effect (Δ ν / T ) in detwinned Ba(Fe 1 − x Co x ) 2 As 2 single crystals emerges at a temperature much higher than the temperature of the magnetic transition (TSDW). Furthermore, the temperature dependence of Δ ν / T retains its exponential character below and above TSDW, which suggests that the origin of nematicity might be something different from magnetic. [Phys. Rev. B 97, 220501(R)] Published Tue Jun 05, 2018

Keywords: Superfluidity and superconductivity

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Resilience of scrambling measurements (2018)

Brian Swingle and Nicole Yunger Halpern

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-06-15

Description: Author(s): Brian Swingle and Nicole Yunger Halpern Most experimental protocols for measuring scrambling require time evolution with a Hamiltonian and with the Hamiltonian's negative counterpart (backward time evolution). Engineering controllable quantum many-body systems for which such forward and backward evolution is possible is a significant expe... [Phys. Rev. A 97, 062113] Published Thu Jun 14, 2018

Keywords: Fundamental concepts

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Work and reversibility in quantum thermodynamics (2018)

Álvaro M. Alhambra, Stephanie Wehner, Mark M. Wilde, and Mischa P. Woods

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-06-16

Description: Author(s): Álvaro M. Alhambra, Stephanie Wehner, Mark M. Wilde, and Mischa P. Woods It is a central question in quantum thermodynamics to determine how irreversible is a process that transforms an initial state ρ to a final state σ and whether such irreversibility can be thought of as a useful resource. For example, we might ask how much work can be obtained by thermalizing ρ to a ... [Phys. Rev. A 97, 062114] Published Fri Jun 15, 2018

Keywords: Fundamental concepts

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Experimental retrodiction of trajectories of single photons in double interferometers (2018)

Yuan Yuan, Zhibo Hou, Kang-Da Wu, Guo-Yong Xiang, Chuan-Feng Li, and Guang-Can Guo

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-06-16

Description: Author(s): Yuan Yuan, Zhibo Hou, Kang-Da Wu, Guo-Yong Xiang, Chuan-Feng Li, and Guang-Can Guo When a photon passes through an interferometer, quantum mechanics does not provide a clear answer as to its past. Quantum retrodiction is a quantitative theory, which endeavors to make statements about the past of a system based on present knowledge. Quantum retrodiction may be used to analyze the p... [Phys. Rev. A 97, 062115] Published Fri Jun 15, 2018

Keywords: Fundamental concepts

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Totally destructive interference for permutation-symmetric many-particle states (2018)

Christoph Dittel, Gabriel Dufour, Mattia Walschaers, Gregor Weihs, Andreas Buchleitner, and Robert Keil

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-06-16

Description: Author(s): Christoph Dittel, Gabriel Dufour, Mattia Walschaers, Gregor Weihs, Andreas Buchleitner, and Robert Keil Interference is at the heart of quantum mechanics and is most intriguing in the complexity of multiple interfering particles. Here fundamental symmetry considerations are used to develop a general formalism for understanding the totally destructive interference of many bosons and fermions. [Phys. Rev. A 97, 062116] Published Fri Jun 15, 2018

Keywords: Fundamental concepts

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Unusual phonon density of states and response to the superconducting transition in the In-doped topological crystalline insulator ${\mathrm{Pb}}_{0.5}{\mathrm{Sn}}_{0.5}\mathrm{Te}$ (2018)

Kejing Ran, Ruidan Zhong, Tong Chen, Yuan Gan, Jinghui Wang, B. L. Winn, A. D. Christianson, Shichao Li, Zhen Ma, Song Bao, Zhengwei Cai, Guangyong Xu, J. M. Tranquada, Genda Gu, Jian Sun, and Jinsheng Wen

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-06-16

Description: Author(s): Kejing Ran, Ruidan Zhong, Tong Chen, Yuan Gan, Jinghui Wang, B. L. Winn, A. D. Christianson, Shichao Li, Zhen Ma, Song Bao, Zhengwei Cai, Guangyong Xu, J. M. Tranquada, Genda Gu, Jian Sun, and Jinsheng Wen We present inelastic neutron scattering results of phonons in ( Pb 0.5 Sn 0.5 ) 1 − x In x Te powders, with x = 0 and 0.3. The x = 0 sample is a topological crystalline insulator, and the x = 0.3 sample is a superconductor with a bulk superconducting transition temperature T c of 4.7 K. In both samples, we observe un... [Phys. Rev. B 97, 220502(R)] Published Fri Jun 15, 2018

Keywords: Superfluidity and superconductivity

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Light polarization measurements in tests of macrorealism (2018)

Eugenio Roldán, Johannes Kofler, and Carlos Navarrete-Benlloch

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-06-19

Description: Author(s): Eugenio Roldán, Johannes Kofler, and Carlos Navarrete-Benlloch According to the world view of macrorealism, the properties of a given system exist prior to and independent of measurement, which is incompatible with quantum mechanics. Leggett and Garg put forward a practical criterion capable of identifying violations of macrorealism, and so far experiments perf... [Phys. Rev. A 97, 062117] Published Mon Jun 18, 2018

Keywords: Fundamental concepts

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Numerical optimal control of spin systems at zero magnetic field (2018)

Min Jiang, Ji Bian, Xiaomei Liu, Hengyan Wang, Yunlan Ji, Bo Zhang, Xinhua Peng, and Jiangfeng Du

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-06-19

Description: Author(s): Min Jiang, Ji Bian, Xiaomei Liu, Hengyan Wang, Yunlan Ji, Bo Zhang, Xinhua Peng, and Jiangfeng Du Zero-field nuclear magnetic resonance (NMR) has been recently developed as a complementary tool for nondestructive structural investigations of matter. However, precise and efficient control in such systems is still at the beginning. Based on the controllability of spin systems, we theoretically stu... [Phys. Rev. A 97, 062118] Published Mon Jun 18, 2018

Keywords: Fundamental concepts

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Weak metal-metal transition in the vanadium oxytelluride ${\mathrm{Rb}}_{1−δ}{\mathrm{V}}_{2}{\mathrm{Te}}_{2}\mathrm{O}$ (2018)

Abduweli Ablimit, Yun-Lei Sun, Hao Jiang, Si-Qi Wu, Ya-Bin Liu, and Guang-Han Cao

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-06-21

Description: Author(s): Abduweli Ablimit, Yun-Lei Sun, Hao Jiang, Si-Qi Wu, Ya-Bin Liu, and Guang-Han Cao We report the synthesis, crystal structure, physical properties, and first-principles calculations of a vanadium-based oxytelluride Rb 1 − δ V 2 Te 2 O ( δ ≈ 0.2 ). The crystal structure bears two-dimensional V 2 O square nets sandwiched with tellurium layers, mimicking the structural motifs of cuprate and iron-b... [Phys. Rev. B 97, 214517] Published Wed Jun 20, 2018

Keywords: Superfluidity and superconductivity

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Large nematic susceptibility in the double-$Q\phantom{\rule{0.16em}{0ex}}{C}_{4}$ magnetic phase of ${\mathrm{Ba}}_{1−x}{\mathrm{Na}}_{x}{\mathrm{Fe}}_{2}{\mathrm{As}}_{2}$ (2018)

Liran Wang, Mingquan He, Frédéric Hardy, Peter Adelmann, Thomas Wolf, Michael Merz, Peter Schweiss, and Christoph Meingast

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-06-23

Description: Author(s): Liran Wang, Mingquan He, Frédéric Hardy, Peter Adelmann, Thomas Wolf, Michael Merz, Peter Schweiss, and Christoph Meingast The nematic susceptibility of Ba 1 − x Na x Fe 2 As 2 single crystals is studied by measuring the Young's modulus using a three-point-bending setup in a capacitance dilatometer over a wide doping range. Particular emphasis is placed on the behavior within the double- Q antiferromagnetic C 4 re-entrant phase. H... [Phys. Rev. B 97, 224518] Published Fri Jun 22, 2018

Keywords: Superfluidity and superconductivity

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Barrier-traversal-time operator and the time-energy uncertainty relation (2018)

Denny Lane B. Sombillo and Eric A. Galapon

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-06-28

Description: Author(s): Denny Lane B. Sombillo and Eric A. Galapon A general barrier-traversal-time operator is constructed using the time-of-arrival formalism. We study the operator's dynamics and determine the role played by the time-energy commutation relation. It turns out that similar dynamics is observed whether the traversal-time operator is canonically conj... [Phys. Rev. A 97, 062127] Published Wed Jun 27, 2018

Keywords: Fundamental concepts

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Testing nonclassicality with exact Wigner currents for an anharmonic quantum system (2018)

Alex E. Bernardini

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-27

Description: Author(s): Alex E. Bernardini Phase-space features of the Wigner flow for an anharmonic quantum system driven by the harmonic oscillator potential modified by the addition of an inverse square (one-dimensional Coulomb-like) contribution are analytically described in terms of Wigner functions and Wigner currents. Reporting about ... [Phys. Rev. A 98, 052128] Published Mon Nov 26, 2018

Keywords: Fundamental concepts

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Gamma-ray vortices emitted from nonlinear inverse Thomson scattering of a two-wavelength laser beam (2018)

Yoshitaka Taira and Masahiro Katoh

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-27

Description: Author(s): Yoshitaka Taira and Masahiro Katoh We develop a classical theory of nonlinear inverse Thomson scattering of a two-wavelength laser beam, which is valid for laser beams with linear or circular polarization and arbitrary intensity and wavelength. We reveal that an electron inside a circularly polarized two-wavelength laser field underg... [Phys. Rev. A 98, 052130] Published Mon Nov 26, 2018

Keywords: Fundamental concepts

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Quantum Zeno effect at finite measurement strength and frequency (2018)

L. Lerner

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-27

Description: Author(s): L. Lerner The evolution of a system subject to measurement is restricted to Zeno subspaces of the measurement Hamiltonian in the limit of strong measurements k in a phenomenon known as the quantum Zeno effect (QZE). As the limit constrains QZE to the lowest orders of perturbation in 1 / k , we derive general exp... [Phys. Rev. A 98, 052132] Published Mon Nov 26, 2018

Keywords: Fundamental concepts

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Negative-temperature-state relaxation and reservoir-assisted quantum entanglement in double-spin-domain systems (2018)

Yusuke Hama, Emi Yukawa, William J. Munro, and Kae Nemoto

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-28

Description: Author(s): Yusuke Hama, Emi Yukawa, William J. Munro, and Kae Nemoto Spin collective phenomena including superradiance are even today being intensively investigated with experimental tests performed based on state-of-the-art quantum technologies. Such attempts are not only for the simple experimental verification of predictions from the last century, but also as a mo... [Phys. Rev. A 98, 052133] Published Tue Nov 27, 2018

Keywords: Fundamental concepts

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Josephson coupling in the dissipative state of a thermally hysteretic $μ$-SQUID (2018)

Sourav Biswas, Clemens B. Winkelmann, Hervé Courtois, and Anjan K. Gupta

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-11-28

Description: Author(s): Sourav Biswas, Clemens B. Winkelmann, Hervé Courtois, and Anjan K. Gupta Micron-sized superconducting interference devices ( μ -SQUIDs) based on constrictions optimized for minimizing thermal runaway are shown to exhibit voltage oscillations with applied magnetic flux despite their hysteretic behavior. We explain this remarkable feature by a significant supercurrent contri... [Phys. Rev. B 98, 174514] Published Tue Nov 27, 2018

Keywords: Superfluidity and superconductivity

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Catching and reversing quantum jumps and thermodynamics of quantum trajectories (2018)

Juan P. Garrahan and Mădălin Guţă

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-11-30

Description: Author(s): Juan P. Garrahan and Mădălin Guţă A recent experiment by Minev et al. , arXiv:1803.00545 demonstrated that in a dissipative (artificial) three-level atom with strongly intermittent dynamics it is possible to “catch and reverse” a quantum jump “midflight”: by the conditional application of a unitary perturbation after a fixed time wit... [Phys. Rev. A 98, 052137] Published Thu Nov 29, 2018

Keywords: Fundamental concepts

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Proving genuine multiparticle entanglement from separable nearest-neighbor marginals (2018)

Marius Paraschiv, Nikolai Miklin, Tobias Moroder, and Otfried Gühne

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-12-04

Description: Author(s): Marius Paraschiv, Nikolai Miklin, Tobias Moroder, and Otfried Gühne We address the question of whether or not global entanglement of a quantum state can be inferred from local properties. Specifically, we are interested in genuinely multiparticle entangled states whose two-body marginals are all separable, but where the entanglement can be proven using knowledge of ... [Phys. Rev. A 98, 062102] Published Mon Dec 03, 2018

Keywords: Fundamental concepts

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Extended quantum Maxwell demon acting over macroscopic distances (2018)

A. V. Lebedev, G. B. Lesovik, V. M. Vinokur, and G. Blatter

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-12-05

Description: Author(s): A. V. Lebedev, G. B. Lesovik, V. M. Vinokur, and G. Blatter A quantum Maxwell demon is a device that can lower the entropy of a quantum system by providing it with purity. The functionality of such a quantum demon is rooted in a quantum-mechanical SWAP operation exchanging mixed and pure states. We describe the setup and performance of a quantum Maxwell demo... [Phys. Rev. B 98, 214502] Published Tue Dec 04, 2018

Keywords: Superfluidity and superconductivity

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Suppression of superfluid stiffness near a Lifshitz-point instability to finite-momentum superconductivity (2018)

Jonatan Wårdh, Brian M. Andersen, and Mats Granath

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-12-05

Description: Author(s): Jonatan Wårdh, Brian M. Andersen, and Mats Granath We derive the effective Ginzburg-Landau (GL) theory for finite-momentum [Fulde-Ferrell-Larkin-Ovchinnikov/pair-density wave (FFLO/PDW)] superconductivity without spin population imbalance from a model with local attraction and repulsive pair hopping. We find that the GL free energy must include up t... [Phys. Rev. B 98, 224501] Published Tue Dec 04, 2018

Keywords: Superfluidity and superconductivity

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Chiral supercurrent through a quantum Hall weak link (2018)

Yahya Alavirad, Junhyun Lee, Ze-Xun Lin, and Jay D. Sau

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-12-07

Description: Author(s): Yahya Alavirad, Junhyun Lee, Ze-Xun Lin, and Jay D. Sau We use an effective model to calculate properties of the supercurrent carried by chiral edge states of a quantum Hall weak link. This “chiral” supercurrent is qualitatively distinct from the usual Josephson supercurrent in that it cannot be mediated by a single edge alone, i.e., both right- and left... [Phys. Rev. B 98, 214504] Published Thu Dec 06, 2018

Keywords: Superfluidity and superconductivity

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Experimental evaluation of the nonclassical relation between measurement errors using entangled photon pairs as a probe (2018)

Masataka Iinuma, Masayuki Nakano, Holger F. Hofmann, and Yutaro Suzuki

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-12-08

Description: Author(s): Masataka Iinuma, Masayuki Nakano, Holger F. Hofmann, and Yutaro Suzuki We have experimentally evaluated the nonclassical relation between measurement errors in a joint measurement of two noncommuting polarizations by using entangled photon pairs as a probe. The joint measurement was realized by filtering polarization directions that are sensitive to both of the two tar... [Phys. Rev. A 98, 062109] Published Fri Dec 07, 2018

Keywords: Fundamental concepts

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Mean-field theory for superconductivity in twisted bilayer graphene (2018)

Teemu J. Peltonen, Risto Ojajärvi, and Tero T. Heikkilä

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-12-11

Description: Author(s): Teemu J. Peltonen, Risto Ojajärvi, and Tero T. Heikkilä Recent experiments show how a bilayer graphene twisted around a certain magic angle becomes superconducting as it is doped into a region with approximate flat bands. We investigate the mean-field s -wave superconducting state in such a system and show how the state evolves as the twist angle is tuned... [Phys. Rev. B 98, 220504(R)] Published Mon Dec 10, 2018

Keywords: Superfluidity and superconductivity

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Anomalous normal-state resistivity in superconducting $\mathrm{L}{\mathrm{a}}_{2−x}\mathrm{C}{\mathrm{e}}_{x}\mathrm{Cu}{\mathrm{O}}_{4}$: Fermi liquid or strange metal? (2018)

Tarapada Sarkar, Richard L. Greene, and S. Das Sarma

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-12-11

Description: Author(s): Tarapada Sarkar, Richard L. Greene, and S. Das Sarma We present experimental results for the in-plane resistivity of the electron-doped cuprate superconductor L a 2 − x C e x Cu O 4 above its transition temperature T c as a function of Ce doping x and temperature. For the doping x between 0.11 and 0.17, where T c varies from 30 K ( x = 0.11 ) to 5 K ( x = 0.17 ), we find... [Phys. Rev. B 98, 224503] Published Mon Dec 10, 2018

Keywords: Superfluidity and superconductivity

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Pressure-induced multiple phase transformations of the ${\mathrm{BaBi}}_{3}$ superconductor (2018)

Li Xiang, Raquel A. Ribeiro, Udhara S. Kaluarachchi, Elena Gati, Manh Cuong Nguyen, Cai-Zhuang Wang, Kai-Ming Ho, Sergey L. Bud'ko, and Paul C. Canfield

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-12-14

Description: Author(s): Li Xiang, Raquel A. Ribeiro, Udhara S. Kaluarachchi, Elena Gati, Manh Cuong Nguyen, Cai-Zhuang Wang, Kai-Ming Ho, Sergey L. Bud'ko, and Paul C. Canfield Measurements of temperature-dependent resistance and magnetization under hydrostatic pressures up to 2.13 GPa are reported for single-crystalline, superconducting BaBi 3 . A temperature-pressure phase diagram is determined and the results suggest three different superconducting phases α , β , and γ in t... [Phys. Rev. B 98, 214509] Published Thu Dec 13, 2018

Keywords: Superfluidity and superconductivity

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Realization of continuous electron doping in bulk iron selenides and identification of a new superconducting zone (2018)

R. J. Sun, Y. Quan, S. F. Jin, Q. Z. Huang, H. Wu, L. Zhao, L. Gu, Z. P. Yin, and X. L. Chen

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-12-13

Description: Author(s): R. J. Sun, Y. Quan, S. F. Jin, Q. Z. Huang, H. Wu, L. Zhao, L. Gu, Z. P. Yin, and X. L. Chen Iron selenide superconductors exhibit unique characteristics distinct from iron pnictides, especially in the electron-doped region. Here, the authors report the synthesis of a new family of Li x (C 3 N 2 H 10 ) 0 . 37 FeSe materials, which features a continuous superconducting dome harboring a Lifshitz transition within the wide range of 0.06 ≤ x ≤ 0.68. Under electron doping, the anion height of FeSe layers deviates linearly away from the optimized values of pnictides. This feature leads to a new superconducting zone with unique electronic structures and strong orbital-selective electronic correlation. [Phys. Rev. B 98, 214508] Published Wed Dec 12, 2018

Keywords: Superfluidity and superconductivity

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Incompatible measurements in a class of general probabilistic theories (2018)

Anna Jenčová

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-07-26

Description: Author(s): Anna Jenčová We study incompatibility of measurements and its relation to steering and nonlocality in a class of finite-dimensional general probabilistic theories (GPTs). The basic idea is to represent finite collections of measurements as affine maps of a state space into a polysimplex and show that incompatibi... [Phys. Rev. A 98, 012133] Published Wed Jul 25, 2018

Keywords: Fundamental concepts

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Strengthening weak measurements of qubit out-of-time-order correlators (2018)

Justin Dressel, José Raúl González Alonso, Mordecai Waegell, and Nicole Yunger Halpern

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-07-26

Description: Author(s): Justin Dressel, José Raúl González Alonso, Mordecai Waegell, and Nicole Yunger Halpern For systems of controllable qubits, we provide a method for experimentally obtaining a useful class of multitime correlators using sequential generalized measurements of arbitrary strength. Specifically, if a correlator can be expressed as an average of nested (anti)commutators of operators that squ... [Phys. Rev. A 98, 012132] Published Wed Jul 25, 2018

Keywords: Fundamental concepts

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Lorentz-boost eigenmodes (2018)

Konstantin Y. Bliokh

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-07-31

Description: Author(s): Konstantin Y. Bliokh Plane waves and cylindrical or spherical vortex modes are important sets of solutions of quantum and classical wave equations. These are eigenmodes of the energy-momentum and angular-momentum operators, i.e., generators of spacetime translations and spatial rotations, respectively. Here we describe ... [Phys. Rev. A 98, 012143] Published Mon Jul 30, 2018

Keywords: Fundamental concepts

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First-principles study of superconductivity in the two- and three-dimensional forms of ${\mathrm{PbTiSe}}_{2}$: Suppressed charge density wave in $1T\text{−}{\mathrm{TiSe}}_{2}$ (2018)

Bao-Tian Wang, Peng-Fei Liu, Jing-Jing Zheng, Wen Yin, and Fangwei Wang

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-07-25

Description: Author(s): Bao-Tian Wang, Peng-Fei Liu, Jing-Jing Zheng, Wen Yin, and Fangwei Wang Layered 1 T − TiSe 2 has attracted much interest for the competition of charge density wave (CDW) and superconductivity in its bulk and even monolayer forms. Here we perform first-principles calculations of the electronic structure, phonon dispersion, and electron-phonon coupling of the Pb-intercalated ... [Phys. Rev. B 98, 014514] Published Tue Jul 24, 2018

Keywords: Superfluidity and superconductivity

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Effect of electrons scattered by optical phonons on superconductivity in $M{\mathrm{H}}_{3}$ ($M=\mathrm{S}$, Ti, V, Se) (2018)

Quan Zhuang, Xilian Jin, Tian Cui, Die Zhang, Ying Li, Xin Li, Kuo Bao, and Bingbing Liu

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-07-25

Description: Author(s): Quan Zhuang, Xilian Jin, Tian Cui, Die Zhang, Ying Li, Xin Li, Kuo Bao, and Bingbing Liu For exploring the superconductivity mechanisms and seeking potential high-temperature superconductors in hydrogen-rich compounds, we perform a systematical investigation of the phase diagram, crystal structures, electronic properties, and electron-phonon coupling (EPC) of titanium hydrides under hig... [Phys. Rev. B 98, 024514] Published Tue Jul 24, 2018

Keywords: Superfluidity and superconductivity

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Fast quantum driving in two-level systems with interaction and nonlinear sweep (2018)

Fu-Quan Dou, Jie Liu, and Li-Bin Fu

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-08-02

Description: Author(s): Fu-Quan Dou, Jie Liu, and Li-Bin Fu We investigate high-fidelity fast quantum driving in a generalized nonlinear two-level system with both interparticle interaction and nonlinear energy sweep. We find that fast quantum dynamics depend on the interaction, energy sweep parameter, and energy sweep strength. We show that the driving prot... [Phys. Rev. A 98, 022102] Published Wed Aug 01, 2018

Keywords: Fundamental concepts

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Tripartite-entanglement detection through tripartite quantum steering in one-sided and two-sided device-independent scenarios (2018)

C. Jebaratnam, Debarshi Das, Arup Roy, Amit Mukherjee, Some Sankar Bhattacharya, Bihalan Bhattacharya, Alberto Riccardi, and Debasis Sarkar

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-08-02

Description: Author(s): C. Jebaratnam, Debarshi Das, Arup Roy, Amit Mukherjee, Some Sankar Bhattacharya, Bihalan Bhattacharya, Alberto Riccardi, and Debasis Sarkar In the present work we study tripartite quantum steering of quantum correlations arising from two local dichotomic measurements on each side in the two types of partially device-independent scenarios: the one-sided device-independent scenario where one of the parties performs untrusted measurements ... [Phys. Rev. A 98, 022101] Published Wed Aug 01, 2018

Keywords: Fundamental concepts

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Self-averaging of random quantum dynamics (2018)

Marcin Łobejko, Jerzy Dajka, and Jerzy Łuczka

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-08-08

Description: Author(s): Marcin Łobejko, Jerzy Dajka, and Jerzy Łuczka The stochastic dynamics of a quantum system driven by N statistically independent random sudden quenches in a fixed time interval is studied. We reveal that with increasing N the system approaches a deterministic limit, indicating self-averaging with respect to its temporal unitary evolution. This p... [Phys. Rev. A 98, 022111] Published Tue Aug 07, 2018

Keywords: Fundamental concepts

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Shedding light on topological superconductors (2018)

K. H. A. Villegas, V. M. Kovalev, F. V. Kusmartsev, and I. G. Savenko

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-08

Description: Author(s): K. H. A. Villegas, V. M. Kovalev, F. V. Kusmartsev, and I. G. Savenko We propose an effective optical approach to monitor superconductors in a two-layer superconductor-normal metal structure. Effectively, such a hybrid system represents a resonator, where electrons are strongly coupled with light. We show that the interaction of light with the superconductor is strong... [Phys. Rev. B 98, 064502] Published Tue Aug 07, 2018

Keywords: Superfluidity and superconductivity

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Classical analog of the Unruh effect (2018)

Ulf Leonhardt, Itay Griniasty, Sander Wildeman, Emmanuel Fort, and Mathias Fink

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-08-14

Description: Author(s): Ulf Leonhardt, Itay Griniasty, Sander Wildeman, Emmanuel Fort, and Mathias Fink In the Unruh effect an observer with constant acceleration perceives the quantum vacuum as thermal radiation. The Unruh effect has been believed to be a pure quantum phenomenon, but here we show theoretically how the effect arises from the correlation of noise, regardless of whether this noise is qu... [Phys. Rev. A 98, 022118] Published Mon Aug 13, 2018

Keywords: Fundamental concepts

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Disorder-sensitive nodelike small gap in FeSe (2018)

Yue Sun, Shunichiro Kittaka, Shota Nakamura, Toshiro Sakakibara, Peng Zhang, Shik Shin, Koki Irie, Takuya Nomoto, Kazushige Machida, Jingting Chen, and Tsuyoshi Tamegai

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-14

Description: Author(s): Yue Sun, Shunichiro Kittaka, Shota Nakamura, Toshiro Sakakibara, Peng Zhang, Shik Shin, Koki Irie, Takuya Nomoto, Kazushige Machida, Jingting Chen, and Tsuyoshi Tamegai We investigate the band structure, nematic state, and superconducting gap structure of two selected FeSe single crystals containing different amounts of disorder. Transport and angle-resolved photoemission spectroscopy measurements show that the small amount of disorder has little effect on the band... [Phys. Rev. B 98, 064505] Published Mon Aug 13, 2018

Keywords: Superfluidity and superconductivity

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Nonexponential long-range interaction of magnetic impurities in spin-orbit coupled superconductors (2018)

A. G. Mal'shukov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-14

Description: Author(s): A. G. Mal'shukov The Ruderman-Kittel-Kasuya-Yosida interaction of magnetic impurities in a superconductor exponentially decreases when the distance r between them is larger than the superconductor's coherence length because this interaction is mediated by quasiparticles, which have a gap in their energy spectra. At ... [Phys. Rev. B 98, 054504] Published Mon Aug 13, 2018

Keywords: Superfluidity and superconductivity

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Quantum phase transitions in proximitized Josephson junctions (2018)

Chien-Te Wu, F. Setiawan, Brandon M. Anderson, Wei-Han Hsiao, and K. Levin

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-14

Description: Author(s): Chien-Te Wu, F. Setiawan, Brandon M. Anderson, Wei-Han Hsiao, and K. Levin We study fermion-parity-changing quantum phase transitions (QPTs) in platform Josephson junctions. These QPTs, associated with zero-energy bound states, are rather widely observed experimentally. They emerge from numerical calculations frequently without detailed microscopic insight. Importantly, th... [Phys. Rev. B 98, 064504] Published Mon Aug 13, 2018

Keywords: Superfluidity and superconductivity

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Short-range antiferromagnetic correlations in the superconducting state of filled skutterudite alloys ${\mathrm{Pr}}_{1−x}{\mathrm{Eu}}_{x}{\mathrm{Pt}}_{4}{\mathrm{Ge}}_{12}$ (2018)

R. B. Adhikari, D. L. Kunwar, I. Jeon, M. B. Maple, M. Dzero, and C. C. Almasan

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-14

Description: Author(s): R. B. Adhikari, D. L. Kunwar, I. Jeon, M. B. Maple, M. Dzero, and C. C. Almasan Motivated by current research efforts toward exploring the interplay between magnetism and superconductivity in multiband electronic systems, we have investigated the effects of Eu substitution through thermodynamic measurements on the superconducting filled skutterudite alloys Pr 1 − x Eu x Pt 4 Ge 12 . An i... [Phys. Rev. B 98, 064506] Published Mon Aug 13, 2018

Keywords: Superfluidity and superconductivity

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Unusual suppression of a spin resonance mode by magnetic field in underdoped ${\mathrm{NaFe}}_{1−x}{\mathrm{Co}}_{x}\mathrm{As}$: Evidence for orbital-selective pairing (2018)

Yu Song, Guotai Tan, Chenglin Zhang, Rasmus Toft-Petersen, Rong Yu, and Pengcheng Dai

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-14

Description: Author(s): Yu Song, Guotai Tan, Chenglin Zhang, Rasmus Toft-Petersen, Rong Yu, and Pengcheng Dai We use inelastic neutron scattering to study the fate of the two spin resonance modes in underdoped superconducting NaFe 1 − x Co x As ( x = 0.0175 ) under applied magnetic fields. While an in-plane magnetic field of B = 12 T only modestly suppresses superconductivity and enhances static antiferromagnetic order,... [Phys. Rev. B 98, 064507] Published Mon Aug 13, 2018

Keywords: Superfluidity and superconductivity

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Optical conductivity of overdoped cuprate superconductors: Application to ${\mathrm{La}}_{2−x}{\mathrm{Sr}}_{x}{\mathrm{CuO}}_{4}$ (2018)

N. R. Lee-Hone, V. Mishra, D. M. Broun, and P. J. Hirschfeld

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-15

Description: Author(s): N. R. Lee-Hone, V. Mishra, D. M. Broun, and P. J. Hirschfeld We argue that recent measurements on both the superfluid density and the optical conductivity of high-quality La 2 − x Sr x CuO 4 (LSCO) films can be understood almost entirely within the theory of disordered BCS d -wave superconductors. The large scattering rates deduced from experiments are shown to arise... [Phys. Rev. B 98, 054506] Published Tue Aug 14, 2018

Keywords: Superfluidity and superconductivity

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Dimensional crossover in the quasi-one-dimensional superconductor ${\mathrm{Tl}}_{2}{\mathrm{Mo}}_{6}{\mathrm{Se}}_{6}$ (2018)

S. Mitra, A. P. Petrović, D. Salloum, P. Gougeon, M. Potel, Jian-Xin Zhu, C. Panagopoulos, and Elbert E. M. Chia

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-15

Description: Author(s): S. Mitra, A. P. Petrović, D. Salloum, P. Gougeon, M. Potel, Jian-Xin Zhu, C. Panagopoulos, and Elbert E. M. Chia We present magnetic penetration depth and electrical transport data in single crystals of quasi-one-dimensional (q1D) Tl 2 Mo 6 Se 6 , which reveal a 1 D → 3 D superconducting dimensional crossover. The c -axis penetration depth shows the onset of superconducting fluctuations below T 1 D o n s = 6.7 K, whereas signat... [Phys. Rev. B 98, 054507] Published Tue Aug 14, 2018

Keywords: Superfluidity and superconductivity

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Linear temperature dependence of the upper critical field across the dome of the ${\mathrm{LaAlO}}_{3}−{\mathrm{SrTiO}}_{3}$ interface superconductor (2018)

L. Kuerten, E. Fillis-Tsirakis, C. Richter, J. Mannhart, and H. Boschker

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-16

Description: Author(s): L. Kuerten, E. Fillis-Tsirakis, C. Richter, J. Mannhart, and H. Boschker Numerous two-dimensional superconductors exhibit a characteristic dome-shaped dependence of the critical temperature T c on the carrier density. The reduction of the critical temperature with increasing charge carrier density on the overdoped side of this dome is frequently related to scattering aris... [Phys. Rev. B 98, 054509] Published Wed Aug 15, 2018

Keywords: Superfluidity and superconductivity

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Geometric Josephson effects in chiral topological nanowires (2018)

Christian Spånslätt

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-16

Description: Author(s): Christian Spånslätt One of the salient signatures of Majorana zero modes and topological superconductivity is a 4 π -periodic Josephson effect due to the combination of fermion parity conservation and the presence of a topologically protected odd number of zero-energy crossings in the Andreev spectrum. In this paper, we ... [Phys. Rev. B 98, 054508] Published Wed Aug 15, 2018

Keywords: Superfluidity and superconductivity

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Time deformations of master equations (2018)

Sergey N. Filippov and Dariusz Chruściński

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-08-18

Description: Author(s): Sergey N. Filippov and Dariusz Chruściński Convolutionless and convolution master equations are the two mostly used physical descriptions of open quantum systems dynamics. We subject these equations to time deformations: local dilations and contractions of time scale. We prove that the convolutionless equation remains legitimate under any ti... [Phys. Rev. A 98, 022123] Published Fri Aug 17, 2018

Keywords: Fundamental concepts

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System information propagation for composite structures (2018)

P. Mironowicz, P. Należyty, P. Horodecki, and J. K. Korbicz

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-08-21

Description: Author(s): P. Mironowicz, P. Należyty, P. Horodecki, and J. K. Korbicz We study in detail the decoherence process of a quantum register, coupled to a composite environment. We use recently developed methods of information transfer study in open quantum systems to analyze information flow between the register and its environment. We show that there are regimes when not ... [Phys. Rev. A 98, 022124] Published Mon Aug 20, 2018

Keywords: Fundamental concepts

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Scattering due to geometry: Case of a spinless particle moving on an asymptotically flat embedded surface (2018)

Neslihan Oflaz, Ali Mostafazadeh, and Mehrdad Ahmady

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-08-21

Description: Author(s): Neslihan Oflaz, Ali Mostafazadeh, and Mehrdad Ahmady A nonrelativistic quantum mechanical particle moving freely on a curved surface feels the effect of the nontrivial geometry of the surface through the kinetic part of the Hamiltonian, which is proportional to the Laplace-Beltrami operator, and a geometric potential, which is a linear combination of ... [Phys. Rev. A 98, 022126] Published Mon Aug 20, 2018

Keywords: Fundamental concepts

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Competition of electron-phonon mediated superconductivity and Stoner magnetism on a flat band (2018)

Risto Ojajärvi, Timo Hyart, Mihail A. Silaev, and Tero T. Heikkilä

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-23

Description: Author(s): Risto Ojajärvi, Timo Hyart, Mihail A. Silaev, and Tero T. Heikkilä The effective attractive interaction between electrons, mediated by electron-phonon coupling, is a well-established mechanism of conventional superconductivity. In metals exhibiting a Fermi surface, the critical temperature of superconductivity is exponentially smaller than the characteristic phonon... [Phys. Rev. B 98, 054515] Published Wed Aug 22, 2018

Keywords: Superfluidity and superconductivity

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Simple harmonic oscillation in a non-Hermitian Su-Schrieffer-Heeger chain at the exceptional point (2018)

K. L. Zhang, P. Wang, G. Zhang, and Z. Song

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-08-22

Description: Author(s): K. L. Zhang, P. Wang, G. Zhang, and Z. Song The balance of gain and loss in an open system may maintain certain Hermitian dynamical behaviors which can be hardly observed in a popular Hermitian system. In this paper, we systematically study a 1D PT -symmetry non-Hermitian Su-Schrieffer-Heeger model with open boundary condition based on an exac... [Phys. Rev. A 98, 022128] Published Tue Aug 21, 2018

Keywords: Fundamental concepts

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Resonant-state expansion applied to one-dimensional quantum systems (2018)

A. Tanimu and E. A. Muljarov

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-08-22

Description: Author(s): A. Tanimu and E. A. Muljarov The resonant-state expansion, a rigorous perturbation theory recently developed in electrodynamics, is applied to nonrelativistic quantum-mechanical systems in one dimension. The method is used here for finding the resonant states in various potentials approximated by combinations of Dirac δ functio... [Phys. Rev. A 98, 022127] Published Tue Aug 21, 2018

Keywords: Fundamental concepts

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Dynamical quantum phase transitions in non-Hermitian lattices (2018)

Longwen Zhou, Qing-hai Wang, Hailong Wang, and Jiangbin Gong

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-08-22

Description: Author(s): Longwen Zhou, Qing-hai Wang, Hailong Wang, and Jiangbin Gong In closed quantum systems, dynamical phase transitions are identified by the nonanalytic behavior of the return probability as a function of time. In this work, we study the nonunitary dynamics following quenches across exceptional points in a non-Hermitian lattice realizable by optical resonators. ... [Phys. Rev. A 98, 022129] Published Tue Aug 21, 2018

Keywords: Fundamental concepts

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Approach to coherent interference fringes in helium-surface scattering (2018)

Matthew C. Schram and Eric J. Heller

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-08-29

Description: Author(s): Matthew C. Schram and Eric J. Heller The conventional notion of elastic, coherent atom-surface scattering originates from the scattering particles acting as a quantum-mechanical matter wave, which coherently interfere to produce distinct Bragg peaks which persist at finite temperature. If we introduce inelastic scattering to this scena... [Phys. Rev. A 98, 022137] Published Tue Aug 28, 2018

Keywords: Fundamental concepts

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Sensitivity of ${T}_{\mathrm{c}}$ to pressure and magnetic field in the cuprate superconductor ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{y}$: Evidence of charge-order suppression by pressure (2018)

O. Cyr-Choinière, D. Le; Boeuf, S. Badoux, S. Dufour-Beauséjour, D. A. Bonn, W. N. Hardy, R. Liang, D. Graf, N. Doiron-Leyraud, and Louis Taillefer

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-08-31

Description: Author(s): O. Cyr-Choinière, D. LeBoeuf, S. Badoux, S. Dufour-Beauséjour, D. A. Bonn, W. N. Hardy, R. Liang, D. Graf, N. Doiron-Leyraud, and Louis Taillefer Cuprate superconductors have a universal tendency to form charge density-wave (CDW) order which competes with superconductivity and is strongest at a doping p ≃ 0.12 . Here we show that in the archetypal cuprate YBa 2 Cu 3 O y (YBCO) pressure suppresses charge order but does not affect the pseudogap phase. ... [Phys. Rev. B 98, 064513] Published Thu Aug 30, 2018

Keywords: Superfluidity and superconductivity

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Coherence orders, decoherence, and quantum metrology (2018)

Diego P. Pires, Isabela A. Silva, Eduardo R. de; Azevedo, Diogo O. Soares-Pinto, and Jefferson G. Filgueiras

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-09-05

Description: Author(s): Diego P. Pires, Isabela A. Silva, Eduardo R. deAzevedo, Diogo O. Soares-Pinto, and Jefferson G. Filgueiras Since the dawn of quantum theory, coherence has been attributed as a key to understand the weirdness of fundamental concepts such as, e.g., the wave-particle duality and the Stern-Gerlach experiment. Recently, based on a resource theory approach, the notion of quantum coherence was revisited and a p... [Phys. Rev. A 98, 032101] Published Tue Sep 04, 2018

Keywords: Fundamental concepts

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Method for the construction of the Lewis-Riesenfeld time-dependent invariants and their eigenvalue equations (2018)

M. A. de Ponte, P. M. Cônsoli, and M. H. Y. Moussa

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-09-05

Description: Author(s): M. A. de Ponte, P. M. Cônsoli, and M. H. Y. Moussa We propose here a method for the construction of the Lewis and Riesenfeld time-dependent invariants. Instead of directly invoking the equation that defines the invariant associated with a time-dependent Hamiltonian, our method allows the step-by-step construction of the invariant as a product of ope... [Phys. Rev. A 98, 032102] Published Tue Sep 04, 2018

Keywords: Fundamental concepts

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Spontaneous edge current in higher chirality superconductors (2018)

Xin Wang, Zhiqiang Wang, and Catherine Kallin

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-09-05

Description: Author(s): Xin Wang, Zhiqiang Wang, and Catherine Kallin The effects of finite temperature, Meissner screening, and surface roughness on the spontaneous edge current for higher chirality quasi-two-dimensional superconductors are studied in the continuum limit using the quasiclassical Eilenberger equations. We find that the total spontaneous current is non... [Phys. Rev. B 98, 094501] Published Tue Sep 04, 2018

Keywords: Superfluidity and superconductivity

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Exactly solvable model for two-dimensional topological superconductors (2018)

Zitao Wang, Shang-Qiang Ning, and Xie Chen

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-09-05

Description: Author(s): Zitao Wang, Shang-Qiang Ning, and Xie Chen In this paper, we present an exactly solvable model for two-dimensional topological superconductors with helical Majorana edge modes protected by time-reversal symmetry. Our construction is based on the idea of decorated domain walls and makes use of the Kasteleyn orientation on a two-dimensional la... [Phys. Rev. B 98, 094502] Published Tue Sep 04, 2018

Keywords: Superfluidity and superconductivity

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Hidden charge-conjugation, parity, and time-reversal symmetries and massive Goldstone (Higgs) modes in superconductors (2018)

Shunji Tsuchiya, Daisuke Yamamoto, Ryosuke Yoshii, and Muneto Nitta

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-09-05

Description: Author(s): Shunji Tsuchiya, Daisuke Yamamoto, Ryosuke Yoshii, and Muneto Nitta A massive Goldstone (MG) mode, often referred to as a Higgs amplitude mode, is a collective excitation that arises in a system involving spontaneous breaking of a continuous symmetry, along with a gapless Nambu-Goldstone mode. It has been known in the previous studies that a pure amplitude MG mode e... [Phys. Rev. B 98, 094503] Published Tue Sep 04, 2018

Keywords: Superfluidity and superconductivity

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High-pressure phase diagram of ${\mathrm{NdFeAsO}}_{0.9}{\mathrm{F}}_{0.1}$: Disappearance of superconductivity on the verge of ferromagnetism from Nd moments (2018)

M. Abdel-Hafiez, M. Mito, K. Shibayama, S. Takagi, M. Ishizuka, A. N. Vasiliev, C. Krellner, and H. K. Mao

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-09-05

Description: Author(s): M. Abdel-Hafiez, M. Mito, K. Shibayama, S. Takagi, M. Ishizuka, A. N. Vasiliev, C. Krellner, and H. K. Mao We investigated transport and magnetic properties of single crystal NdFeAsO 0.9 F 0.1 under hydrostatic pressures up to 50 GPa. The ambient pressure superconductivity at T c ∼ 45.4 K was fully suppressed at P c ∼ 21 GPa. Upon a further increase of pressure, ferromagnetism associated with the order of the ra... [Phys. Rev. B 98, 094504] Published Tue Sep 04, 2018

Keywords: Superfluidity and superconductivity

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Solitonic thermal transport in a current-biased long Josephson junction (2018)

Claudio Guarcello, Paolo Solinas, Alessandro Braggio, and Francesco Giazotto

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-09-05

Description: Author(s): Claudio Guarcello, Paolo Solinas, Alessandro Braggio, and Francesco Giazotto We investigate the coherent energy and thermal transport in a temperature-biased long Josephson tunnel junction, when a Josephson vortex, i.e., a soliton, steadily drifts driven by an electric bias current. We demonstrate that thermal transport through the junction can be controlled by the bias curr... [Phys. Rev. B 98, 104501] Published Tue Sep 04, 2018

Keywords: Superfluidity and superconductivity

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Objectivity (or lack thereof): Comparison between predictions of quantum Darwinism and spectrum broadcast structure (2018)

Thao P. Le and Alexandra Olaya-Castro

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-09-06

Description: Author(s): Thao P. Le and Alexandra Olaya-Castro Quantum Darwinism and spectrum broadcast structure describe the emergence of objectivity in quantum systems. However, it is unclear whether these two frameworks lead to consistent predictions on the objectivity of the state of a quantum system in a given scenario. In this paper, we jointly investiga... [Phys. Rev. A 98, 032103] Published Wed Sep 05, 2018

Keywords: Fundamental concepts

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Quantum walks over a square lattice (2018)

Arkaprabha Ghosal and Prasenjit Deb

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-09-07

Description: Author(s): Arkaprabha Ghosal and Prasenjit Deb Quantum random walk finds application in efficient quantum algorithms as well as in quantum network theory. Here we study the mixing time of a discrete quantum walk over a square lattice in the presence of dynamic percolation and decoherence. We consider bit-flip and phase damping noise, and evaluat... [Phys. Rev. A 98, 032104] Published Thu Sep 06, 2018

Keywords: Fundamental concepts

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Polarization of the spontaneous magnetic field and magnetic fluctuations in $\mathit{s}+\mathit{is}$ anisotropic multiband superconductors (2018)

V. L. Vadimov and M. A. Silaev

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-09-08

Description: Author(s): V. L. Vadimov and M. A. Silaev We show that multiband superconductors with broken time-reversal symmetry can produce spontaneous currents and magnetic fields in response to the local variations of pairing constants. Considering the iron pnictide superconductor Ba 1 − x K x Fe 2 As 2 as an example we demonstrate that both the point-group s... [Phys. Rev. B 98, 104504] Published Fri Sep 07, 2018

Keywords: Superfluidity and superconductivity

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Magnetoenhancement of superconductivity in composite $d$-wave superconductors (2018)

Mauro Schiulaz, Christopher L. Baldwin, Chris R. Laumann, and Boris Z. Spivak

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-09-11

Description: Author(s): Mauro Schiulaz, Christopher L. Baldwin, Chris R. Laumann, and Boris Z. Spivak We study composite d -wave superconductors consisting of randomly oriented and randomly distributed superconducting droplets embedded in a matrix. In a certain range of parameters the application of a small magnetic field enhances the superconductivity in these materials, while larger fields suppress... [Phys. Rev. B 98, 094508] Published Mon Sep 10, 2018

Keywords: Superfluidity and superconductivity

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Quantum uncertainty relation based on the mean deviation (2018)

Gautam Sharma, Chiranjib Mukhopadhyay, Sk Sazim, and Arun Kumar Pati

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-09-12

Description: Author(s): Gautam Sharma, Chiranjib Mukhopadhyay, Sk Sazim, and Arun Kumar Pati Traditional forms of quantum uncertainty relations are invariably based on the standard deviation. This can be understood in the historical context of simultaneous development of quantum theory and mathematical statistics. Here we present alternative forms of uncertainty relations, in both state-dep... [Phys. Rev. A 98, 032106] Published Tue Sep 11, 2018

Keywords: Fundamental concepts

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Self-consistent temperature dependence of quasiparticle bands in monolayer FeSe on ${\mathrm{SrTiO}}_{3}$ (2018)

Fabian Schrodi, Alex Aperis, and Peter M. Oppeneer

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-09-12

Description: Author(s): Fabian Schrodi, Alex Aperis, and Peter M. Oppeneer We study the temperature evolution of the quasiparticle bands of the FeSe monolayer on the SrTiO 3 (STO) substrate from 10 to 300 K by applying the anisotropic, multiband, and full-bandwidth Eliashberg theory. To achieve this, we extend this theory by self-consistently coupling the chemical potential... [Phys. Rev. B 98, 094509] Published Tue Sep 11, 2018

Keywords: Superfluidity and superconductivity

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Gap equation with pairing correlations beyond the mean-field approximation and its equivalence to a Hugenholtz-Pines condition for fermion pairs (2018)

L. Pisani, P. Pieri, and G. Calvanese Strinati

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-09-12

Description: Author(s): L. Pisani, P. Pieri, and G. Calvanese Strinati The equation for the gap parameter represents the main equation of the pairing theory of superconductivity. Although it is formally defined through a single-particle property, physically, it reflects the pairing correlations between opposite-spin fermions. Here, we exploit this physical connection a... [Phys. Rev. B 98, 104507] Published Tue Sep 11, 2018

Keywords: Superfluidity and superconductivity

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Persistence of pinning and creep beyond critical drive within the strong pinning paradigm (2018)

M. Buchacek, R. Willa, V. B. Geshkenbein, and G. Blatter

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-09-13

Description: Author(s): M. Buchacek, R. Willa, V. B. Geshkenbein, and G. Blatter Pinning and thermal creep determine the response of numerous systems containing superstructures, e.g., vortices in type II superconductors, domain walls in ferroics, or dislocations in metals. The combination of drive and thermal fluctuations leads to the superstructure's depinning, and its velocity... [Phys. Rev. B 98, 094510] Published Wed Sep 12, 2018

Keywords: Superfluidity and superconductivity

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Critical behavior of dynamic vortex Mott transition in superconducting arrays at fractional vortex densities (2018)

Enzo Granato

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-09-13

Description: Author(s): Enzo Granato We study the differential resistivity transition of two-dimensional superconducting arrays induced by an external driving current, in the presence of thermal fluctuations and a magnetic field corresponding to f flux quantum per plaquette. Recent experiments have identified this transition as a dynam... [Phys. Rev. B 98, 094511] Published Wed Sep 12, 2018

Keywords: Superfluidity and superconductivity

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Optimal quantum preparation contextuality in an $n$-bit parity-oblivious multiplexing task (2018)

Shouvik Ghorai and A. K. Pan

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-09-15

Description: Author(s): Shouvik Ghorai and A. K. Pan In [ Phys. Rev. Lett. 102 , 010401 (2009) ], Spekkens et al. have shown that quantum preparation contextuality can power the parity-oblivious multiplexing (POM) task. The bound on the optimal success probability of an n -bit POM task performed with the classical resources was shown to be the same as in ... [Phys. Rev. A 98, 032110] Published Fri Sep 14, 2018

Keywords: Fundamental concepts

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Transverse vortex commensurability effect and sign change of the Hall voltage in superconducting ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7−δ}$ thin films with a nanoscale periodic pinning landscape (2018)

G. Zechner, W. Lang, M. Dosmailov, M. A. Bodea, and J. D. Pedarnig

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-09-19

Description: Author(s): G. Zechner, W. Lang, M. Dosmailov, M. A. Bodea, and J. D. Pedarnig In superconductors with a periodic pinning potential, the vortices can lock into a commensurate arrangement, where each pin is filled by one vortex. Then, an intriguing duality between conduction electrons in a normal metal and mobile vortices in a superconductor arises. While the mutual repulsion of electrons can evoke a Mott insulator, the interaction between mobile and commensurably trapped vortices can lead to a vortex Mott metal-to-insulator transition with vanishing resistance. The authors report on a hitherto unknown manifestation of such a state, uncovered by measurements of the voltage orthogonal to the injected current. This vortex Hall effect exhibits a sharp peak and a change of sign when the number of vortices exactly matches that of the pins. [Phys. Rev. B 98, 104508] Published Tue Sep 18, 2018

Keywords: Superfluidity and superconductivity

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Quantum theories from principles without assuming a definite causal structure (2018)

Ding Jia (贾丁)

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-09-20

Description: Author(s): Ding Jia (贾丁) There has been a body of work deriving the complex Hilbert-space structure of quantum theory from axioms/principles/postulates to deepen our understanding of quantum theory and to reveal ways to go beyond it to resolve foundational issues. Recent progress in incorporating indefinite causal structure... [Phys. Rev. A 98, 032112] Published Wed Sep 19, 2018

Keywords: Fundamental concepts

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Stochastic decoupling approach to the spin-boson dynamics: Perturbative and nonperturbative treatments (2018)

Wei Wu

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2018-09-22

Description: Author(s): Wei Wu We develop a hierarchical functional derivative (HFD) method to investigate the reduced dynamics of a spin-boson model within the framework of a stochastic decoupling description. Keeping only the lowest-order truncation of the hierarchical functional derivatives, one can recover the second-order Na... [Phys. Rev. A 98, 032116] Published Fri Sep 21, 2018

Keywords: Fundamental concepts

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Self-energies and quasiparticle scattering interference (2018)

Miguel Antonio Sulangi and Jan Zaanen

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-09-25

Description: Author(s): Miguel Antonio Sulangi and Jan Zaanen The cuprate high-temperature superconductors are known to host a wide array of effects due to interactions and disorder. In this paper, we look at some of the consequences of these effects which can be visualized by scanning tunneling spectroscopy in order to provide a guide for future experiments. ... [Phys. Rev. B 98, 094518] Published Mon Sep 24, 2018

Keywords: Superfluidity and superconductivity

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Normal-state properties of the antiperovskite oxide ${\mathrm{Sr}}_{3−x}\mathrm{SnO}$ revealed by $^{119}\mathrm{Sn}$-NMR (2018)

Shunsaku Kitagawa, Kenji Ishida, Mohamed Oudah, Jan Niklas Hausmann, Atsutoshi Ikeda, Shingo Yonezawa, and Yoshiteru Maeno

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-09-22

Description: Author(s): Shunsaku Kitagawa, Kenji Ishida, Mohamed Oudah, Jan Niklas Hausmann, Atsutoshi Ikeda, Shingo Yonezawa, and Yoshiteru Maeno We have performed Sn 119 -NMR measurements on the antiperovskite oxide superconductor Sr 3 − x SnO to investigate how its normal state changes with the Sr deficiency. A two-peak structure was observed in the NMR spectra of all the measured samples. This suggests that the phase separation tends to occur be... [Phys. Rev. B 98, 100503(R)] Published Fri Sep 21, 2018

Keywords: Superfluidity and superconductivity

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Effect of gap anisotropy on the spin resonance peak in the superconducting state of iron-based materials (2018)

M. M. Korshunov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-09-25

Description: Author(s): M. M. Korshunov Spin resonance in the superconducting state of Fe-based materials within the multiorbital model with unequal anisotropic gaps on different Fermi surface sheets is studied. On the basis of the model gap function and the one calculated within the spin fluctuation theory of pairing, I show that the res... [Phys. Rev. B 98, 104510] Published Mon Sep 24, 2018

Keywords: Superfluidity and superconductivity

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How vortex bound states affect the Hall conductivity of a chiral $p±ip$ superconductor (2018)

Daniel Ariad, Yshai Avishai, and Eytan Grosfeld

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-09-25

Description: Author(s): Daniel Ariad, Yshai Avishai, and Eytan Grosfeld The physics of a planar chiral p ± i p superconductor is studied for various vortex configurations. The occurrence of vortex quasiparticle bound states is exposed together with their ensuing collective properties, such as subgap bands induced by intervortex tunneling. A general method to diagonalize th... [Phys. Rev. B 98, 104511] Published Mon Sep 24, 2018

Keywords: Superfluidity and superconductivity

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Spin-split conductance and subgap peak in ferromagnet/superconductor spin valve heterostructures (2018)

Evan Moen and Oriol T. Valls

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-09-26

Description: Author(s): Evan Moen and Oriol T. Valls We consider the separate spin channel contributions to the charge conductance in superconducting/ferromagnetic spin valve F 1 / N / F 2 / S structures. We find that the up- and down-spin conductance contributions may have a very different behavior in the subgap bias region (i.e., there is a spin-split condu... [Phys. Rev. B 98, 104512] Published Tue Sep 25, 2018

Keywords: Superfluidity and superconductivity

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Thermoelectric studies of ${\mathrm{Ir}}_{1−x}{\mathrm{Rh}}_{x}{\mathrm{Te}}_{2}$ ($0≤x≤0.3$) (2018)

Yu Liu (刘育), Hechang Lei (雷和畅), Kefeng Wang (王克锋), Milinda Abeykoon, J. B. Warren, Emil Bozin, and C. Petrovic

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-09-27

Description: Author(s): Yu Liu (刘育), Hechang Lei (雷和畅), Kefeng Wang (王克锋), Milinda Abeykoon, J. B. Warren, Emil Bozin, and C. Petrovic We report thermoelectric properties of Ir 1 − x Rh x Te 2 ( 0 ≤ x ≤ 0.3 ) alloy series where superconductivity at low temperatures emerges as the high-temperature structural transition ( T s ) is suppressed. The isovalent ionic substitution of Rh into Ir has different effects on physical properties when compared to... [Phys. Rev. B 98, 094519] Published Wed Sep 26, 2018

Keywords: Superfluidity and superconductivity

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Generation of pure superconducting spin current in magnetic heterostructures via nonlocally induced magnetism due to Landau Fermi liquid effects (2018)

X. Montiel and M. Eschrig

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2018-09-27

Description: Author(s): X. Montiel and M. Eschrig The authors propose a novel mechanism for the creation of superconducting spin currents in a ferromagnet/superconductor/normal-metal heterostructure via a non-locally induced exchange field in the normal layer, which exhibits Landau Fermi liquid interactions. When the structure enters the superconducting state, spin-triplet superconducting correlations transfer spin across the superconductor and induce remotely a magnetization in the normal layer. The authors then show that in the presence of strong spin-orbit interaction in the normal-metal layer, the induced magnetization is rotated with respect to the magnetization in the ferromagnet. This magnetization misalignment leads to a spin torque on both magnetizations and causes a superconducting spin current to flow across the superconductor. These results open new avenues for designing devices for superconducting spintronics. [Phys. Rev. B 98, 104513] Published Wed Sep 26, 2018

Keywords: Superfluidity and superconductivity

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