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Coherent quantum dynamics: What fluctuations can tell (2015)

John Schliemann

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): John Schliemann Coherent states provide a natural connection of quantum systems to their classical limit and are employed in various fields of physics. Here we derive general systematic expansions, with respect to quantum parameters, of expectation values of products of arbitrary operators within both oscillator co… [Phys. Rev. A 92, 022108] Published Mon Aug 10, 2015

Schlagwort(e): Fundamental concepts

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Digitale ISSN: 1094-1622

Thema: Physik

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Clauser-Horne Bell test with imperfect random inputs (2015)

Xiao Yuan, Qi Zhao, and Xiongfeng Ma

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Xiao Yuan, Qi Zhao, and Xiongfeng Ma The Bell test is one of the most important tools in quantum information science. On the one hand, it enables fundamental tests of the basic physics laws of nature, and on the other hand, it can also be applied in a variety of device-independent tasks such as quantum key distribution and random numbe… [Phys. Rev. A 92, 022107] Published Mon Aug 10, 2015

Schlagwort(e): Fundamental concepts

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Direct surface charging and alkali-metal doping for tuning the interlayer magnetic order in planar nanostructures (2015)

Tamene R. Dasa and Valeri S. Stepanyuk

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Tamene R. Dasa and Valeri S. Stepanyuk The continuous reduction of magnetic units to ultrasmall length scales inspires efforts to look for a suitable means of controlling magnetic states. In this study, we show two surface charge alteration techniques for tuning the interlayer exchange coupling of ferromagnetic layers separated by parama… [Phys. Rev. B 92, 075412] Published Mon Aug 10, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

Print ISSN: 1098-0121

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Thema: Physik

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TiS_{3} nanoribbons: Width-independent band gap and strain-tunable electronic properties (2015)

Jun Kang, Hasan Sahin, H. Duygu Ozaydin, R. Tugrul Senger, and François M. Peeters

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Jun Kang, Hasan Sahin, H. Duygu Ozaydin, R. Tugrul Senger, and François M. Peeters The electronic properties, carrier mobility, and strain response of TiS 3 nanoribbons ( TiS 3 NRs) are investigated by first-principles calculations. We found that the electronic properties of TiS 3 NRs strongly depend on the edge type ( a or b ). All a - TiS 3 NRs are metallic with a magnetic ground state, … [Phys. Rev. B 92, 075413] Published Mon Aug 10, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Thema: Physik

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Real-space imaging of nanotip plasmons using electron energy loss spectroscopy (2015)

Benjamin Schröder, Thorsten Weber, Sergey V. Yalunin, Thomas Kiel, Christian Matyssek, Murat Sivis, Sascha Schäfer, Felix von Cube, Stephan Irsen, Kurt Busch, Claus Ropers, and Stefan Linden

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Benjamin Schröder, Thorsten Weber, Sergey V. Yalunin, Thomas Kiel, Christian Matyssek, Murat Sivis, Sascha Schäfer, Felix von Cube, Stephan Irsen, Kurt Busch, Claus Ropers, and Stefan Linden We report the spatial mapping of surface plasmons on conical gold nanotips by electron energy loss spectroscopy. We observe standing-wave patterns resulting from reflections of the fundamental surface-plasmon mode at the nanotip apex. The experimental results are in very good agreement with numerica… [Phys. Rev. B 92, 085411] Published Mon Aug 10, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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OH-terminated two-dimensional transition metal carbides and nitrides as ultralow work function materials (2015)

Mohammad Khazaei, Masao Arai, Taizo Sasaki, Ahmad Ranjbar, Yunye Liang, and Seiji Yunoki

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Mohammad Khazaei, Masao Arai, Taizo Sasaki, Ahmad Ranjbar, Yunye Liang, and Seiji Yunoki MXenes are a set of two-dimensional transition metal carbides and nitrides that offer many potential applications in energy storage and electronic devices. As an important parameter to design new electronic devices, we investigate the work functions of bare MXenes and their functionalized ones with … [Phys. Rev. B 92, 075411] Published Mon Aug 10, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Phonon-limited carrier mobility and resistivity from carbon nanotubes to graphene (2015)

Jing Li, Henrique Pereira Coutada Miranda, Yann-Michel Niquet, Luigi Genovese, Ivan Duchemin, Ludger Wirtz, and Christophe Delerue

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-12

Beschreibung: Author(s): Jing Li, Henrique Pereira Coutada Miranda, Yann-Michel Niquet, Luigi Genovese, Ivan Duchemin, Ludger Wirtz, and Christophe Delerue Under which conditions do the electrical transport properties of one-dimensional (1D) carbon nanotubes (CNTs) and 2D graphene become equivalent? We have performed atomistic calculations of the phonon-limited electrical mobility in graphene and in a wide range of CNTs of different types to address th… [Phys. Rev. B 92, 075414] Published Tue Aug 11, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Helicoidal graphene nanoribbons: Chiraltronics (2015)

Victor Atanasov and Avadh Saxena

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-07-30

Beschreibung: Author(s): Victor Atanasov and Avadh Saxena We present a calculation of the effective geometry-induced quantum potential for the carriers in graphene shaped as a helicoidal nanoribbon. In this geometry the twist of the nanoribbon plays the role of an effective transverse electric field in graphene and this is reminiscent of the Hall effect. H… [Phys. Rev. B 92, 035440] Published Wed Jul 29, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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9

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Stacking dependence of carrier interactions in multilayer graphene systems (2015)

Yunsu Jang, E. H. Hwang, A. H. Mac; Donald, and Hongki Min

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-07-30

Beschreibung: Author(s): Yunsu Jang, E. H. Hwang, A. H. MacDonald, and Hongki Min We identify qualitative trends in the stacking sequence dependence of carrier-carrier interaction phenomena in multilayer graphene. Our theory is based on an approach which explicitly exhibits the important role in interaction phenomena of the momentum-direction-dependent intersite phases determined… [Phys. Rev. B 92, 041411(R)] Published Wed Jul 29, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Stability and electronic structure of two-dimensional allotropes of group-IV materials (2015)

Filipe Matusalem, Marcelo Marques, Lara K. Teles, and Friedhelm Bechstedt

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-07-30

Beschreibung: Author(s): Filipe Matusalem, Marcelo Marques, Lara K. Teles, and Friedhelm Bechstedt We study six different two-dimensional (2D) allotropes of carbon, silicon, germanium, and tin by means of the ab initio density functional theory for the ground state and approximate methods to calculate their electronic structures, including quasiparticle effects. Four of the investigated allotrope… [Phys. Rev. B 92, 045436] Published Wed Jul 29, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Continuous-variable quantum process tomography with squeezed-state probes (2015)

Jaromír Fiurášek

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Jaromír Fiurášek We propose a procedure for tomographic characterization of continuous-variable quantum operations which employs homodyne detection and single-mode squeezed probe states with a fixed degree of squeezing and antisqueezing and a variable displacement and orientation of squeezing ellipse. Density matrix… [Phys. Rev. A 92, 022101] Published Mon Aug 03, 2015

Schlagwort(e): Fundamental concepts

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Digitale ISSN: 1094-1622

Thema: Physik

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Electric bias control of impurity effects in bilayer graphene (2015)

Y. G. Pogorelov, M. C. Santos, and V. M. Loktev

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Y. G. Pogorelov, M. C. Santos, and V. M. Loktev Formation of localized impurity levels within the band gap in bigraphene under applied electric field and the conditions for their collectivization at finite impurity concentrations are considered. It is shown that a qualitative restructuring of the quasiparticle spectrum within the initial band gap… [Phys. Rev. B 92, 075401] Published Mon Aug 03, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Electronic spectrum of twisted bilayer graphene (2015)

A. O. Sboychakov, A. L. Rakhmanov, A. V. Rozhkov, and Franco Nori

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): A. O. Sboychakov, A. L. Rakhmanov, A. V. Rozhkov, and Franco Nori We study the electronic properties of twisted bilayer graphene in the tight-binding approximation. The interlayer hopping amplitude is modeled by a function which depends not only on the distance between two carbon atoms, but also on the positions of neighboring atoms as well. Using the Lanczos algo… [Phys. Rev. B 92, 075402] Published Mon Aug 03, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Electrical transport limited by electron-phonon coupling from Boltzmann transport equation: An ab initio study of Si, Al, and MoS_{2} (2015)

Wu Li

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): Wu Li We demonstrate the ab initio electrical transport calculation limited by electron-phonon coupling by using the full solution of the Boltzmann transport equation (BTE), which applies equally to metals and semiconductors. Numerical issues are emphasized in this work. We show that the simple linear int… [Phys. Rev. B 92, 075405] Published Tue Aug 04, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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15

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Supercurrent reversal in Josephson junctions based on bilayer graphene flakes (2015)

Babak Zare Rameshti, Malek Zareyan, and Ali G. Moghaddam

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): Babak Zare Rameshti, Malek Zareyan, and Ali G. Moghaddam We investigate the Josephson effect in a bilayer graphene flake contacted by two monolayer sheets deposited by superconducting electrodes. It is found that when the electrodes are attached to the different layers of the bilayer, the Josephson current is in a π state, if the bilayer region is undoped… [Phys. Rev. B 92, 085403] Published Wed Aug 05, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Nonlinear Michelson interferometer for improved quantum metrology (2015)

Alfredo Luis and Ángel Rivas

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): Alfredo Luis and Ángel Rivas We examine quantum detection via a Michelson interferometer embedded in a gas with Kerr nonlinearity. This nonlinear interferometer is illuminated by pulses of classical light. This strategy combines the robustness against practical imperfections of classical light with the improvement provided by n… [Phys. Rev. A 92, 022104] Published Fri Aug 07, 2015

Schlagwort(e): Fundamental concepts

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17

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Heisenberg scaling in Gaussian quantum metrology (2015)

Nicolai Friis, Michalis Skotiniotis, Ivette Fuentes, and Wolfgang Dür

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): Nicolai Friis, Michalis Skotiniotis, Ivette Fuentes, and Wolfgang Dür We address the issue of precisely estimating small parameters encoded in a general linear transformation of the modes of a bosonic quantum field. Such Bogoliubov transformations frequently appear in the context of quantum optics. We provide a set of instructions for computing the quantum Fisher info… [Phys. Rev. A 92, 022106] Published Fri Aug 07, 2015

Schlagwort(e): Fundamental concepts

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18

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Physics of a disordered Dirac point in epitaxial graphene from temperature-dependent magnetotransport measurements (2015)

J. Huang, J. A. Alexander-Webber, A. M. R. Baker, T. J. B. M. Janssen, A. Tzalenchuk, V. Antonov, T. Yager, S. Lara-Avila, S. Kubatkin, R. Yakimova, and R. J. Nicholas

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): J. Huang, J. A. Alexander-Webber, A. M. R. Baker, T. J. B. M. Janssen, A. Tzalenchuk, V. Antonov, T. Yager, S. Lara-Avila, S. Kubatkin, R. Yakimova, and R. J. Nicholas We report a study of disorder effects on epitaxial graphene in the vicinity of the Dirac point by magnetotransport. Hall effect measurements show that the carrier density increases quadratically with temperature, in good agreement with theoretical predictions which take into account intrinsic therma… [Phys. Rev. B 92, 075407] Published Thu Aug 06, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Thema: Physik

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Detection of interlayer interaction in few-layer graphene (2015)

Zefei Wu, Yu Han, Jiangxiazi Lin, Wei Zhu, Mingquan He, Shuigang Xu, Xiaolong Chen, Huanhuan Lu, Weiguang Ye, Tianyi Han, Yingying Wu, Gen Long, Junying Shen, Rui Huang, Lin Wang, Yuheng He, Yuan Cai, Rolf Lortz, Dangsheng Su, and Ning Wang

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): Zefei Wu, Yu Han, Jiangxiazi Lin, Wei Zhu, Mingquan He, Shuigang Xu, Xiaolong Chen, Huanhuan Lu, Weiguang Ye, Tianyi Han, Yingying Wu, Gen Long, Junying Shen, Rui Huang, Lin Wang, Yuheng He, Yuan Cai, Rolf Lortz, Dangsheng Su, and Ning Wang Bernal-stacked few-layer graphene has been investigated by analyzing its Landau-level spectra through quantum capacitance measurements. We find that surface relaxation, which is insignificant in trilayer graphene, starts to manifest in Bernal-stacked tetralayer graphene. In trilayer graphene, the in… [Phys. Rev. B 92, 075408] Published Thu Aug 06, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Quantum Darwinism and non-Markovian dissipative dynamics from quantum phases of the spin-1/2 XX model (2015)

Gian Luca Giorgi, Fernando Galve, and Roberta Zambrini

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): Gian Luca Giorgi, Fernando Galve, and Roberta Zambrini Quantum Darwinism explains the emergence of a classical description of objects in terms of the creation of many redundant registers in an environment containing their classical information. This amplification phenomenon, where only classical information reaches the macroscopic observer and through w… [Phys. Rev. A 92, 022105] Published Fri Aug 07, 2015

Schlagwort(e): Fundamental concepts

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Entanglement of indistinguishable particles as a probe for quantum phase transitions in the extended Hubbard model (2015)

Fernando Iemini, Thiago O. Maciel, and Reinaldo O. Vianna

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-19

Beschreibung: Author(s): Fernando Iemini, Thiago O. Maciel, and Reinaldo O. Vianna We investigate the quantum phase transitions of the extended Hubbard model at half-filling with periodic boundary conditions employing the entanglement of particles, as opposed to the more traditional entanglement of modes. Our results show that the entanglement has either discontinuities or local m… [Phys. Rev. B 92, 075423] Published Tue Aug 18, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Toward a realistic description of multilayer black phosphorus: From GW approximation to large-scale tight-binding simulations (2015)

A. N. Rudenko, Shengjun Yuan, and M. I. Katsnelson

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-19

Beschreibung: Author(s): A. N. Rudenko, Shengjun Yuan, and M. I. Katsnelson We provide a tight-binding model parametrization for black phosphorus (BP) with an arbitrary number of layers. The model is derived from partially self-consistent G W 0 approach, where the screened Coulomb interaction W 0 is calculated within the random phase approximation on the basis of density funct… [Phys. Rev. B 92, 085419] Published Tue Aug 18, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Topological symmetry breaking: Domain walls and partial instability of chiral edges (2015)

F. A. Bais and S. M. Haaker

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-20

Beschreibung: Author(s): F. A. Bais and S. M. Haaker In two-dimensional topological systems chiral edges may exhibit a spectral change due to the formation of a Bose condensate and partial confinement in the bulk according to the topological symmetry breaking (TSB) mechanism. We analyze in detail what happens in the bulk as well as on the edge for a s… [Phys. Rev. B 92, 075427] Published Wed Aug 19, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Interaction-induced conductance from zero modes in a clean magnetic graphene waveguide (2015)

Laura Cohnitz, Wolfgang Häusler, Alex Zazunov, and Reinhold Egger

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-21

Beschreibung: Author(s): Laura Cohnitz, Wolfgang Häusler, Alex Zazunov, and Reinhold Egger We consider a waveguide formed in a clean graphene monolayer by a spatially inhomogeneous magnetic field. The single-particle dispersion relation for this waveguide exhibits a zero-energy Landau-like flat band, while finite-energy bands have dispersion and correspond, in particular, to snake orbits.… [Phys. Rev. B 92, 085422] Published Thu Aug 20, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Large-gap two-dimensional topological insulator in oxygen functionalized MXene (2015)

Hongming Weng, Ahmad Ranjbar, Yunye Liang, Zhida Song, Mohammad Khazaei, Seiji Yunoki, Masao Arai, Yoshiyuki Kawazoe, Zhong Fang, and Xi Dai

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-25

Beschreibung: Author(s): Hongming Weng, Ahmad Ranjbar, Yunye Liang, Zhida Song, Mohammad Khazaei, Seiji Yunoki, Masao Arai, Yoshiyuki Kawazoe, Zhong Fang, and Xi Dai Two-dimensional (2D) topological insulators (TIs) have been recognized as a new class of quantum state of matter. They are distinguished from normal 2D insulators with their nontrivial band-structure topology identified by the Z 2 number as protected by time-reversal symmetry (TRS). Two-dimensional T… [Phys. Rev. B 92, 075436] Published Mon Aug 24, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Interaction-enabled topological phases in topological insulator–superconductor heterostructures (2015)

D. I. Pikulin, Ching-Kai Chiu, Xiaoyu Zhu, and M. Franz

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-25

Beschreibung: Author(s): D. I. Pikulin, Ching-Kai Chiu, Xiaoyu Zhu, and M. Franz Topological phases of matter that depend for their existence on interactions are fundamentally interesting and potentially useful as platforms for future quantum computers. Despite the multitude of theoretical proposals, the only interaction-enabled topological phase experimentally observed is the f… [Phys. Rev. B 92, 075438] Published Mon Aug 24, 2015

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Cost of postselection in decision theory (2015)

Joshua Combes and Christopher Ferrie

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-20

Beschreibung: Author(s): Joshua Combes and Christopher Ferrie Postselection is the process of discarding outcomes from statistical trials that are not the event one desires. Postselection can be useful in many applications where the cost of getting the wrong event is implicitly high. However, unless this cost is specified exactly, one might conclude that disca… [Phys. Rev. A 92, 022117] Published Wed Aug 19, 2015

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Casimir forces of metallic microstructures into cavities (2015)

George Kenanakis, Costas M. Soukoulis, and Eleftherios N. Economou

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-20

Beschreibung: Author(s): George Kenanakis, Costas M. Soukoulis, and Eleftherios N. Economou A theoretical estimate of the Casimir force of a metallic structure embedded into a cubic cavity is proposed. We demonstrate that by calculating the eigenmodes of the system we can determine the Casimir force, which can be either attractive or repulsive, by simply changing the geometry of the struct… [Phys. Rev. B 92, 075430] Published Wed Aug 19, 2015

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Nature of the bias-dependent symmetry reduction of iron phthalocyanine on Cu(111) (2015)

Olesia Snezhkova, Johann Lüder, Alissa Wiengarten, Shiri R. Burema, Felix Bischoff, Yuanqin He, Jan Rusz, Jan Knudsen, Marie-Laure Bocquet, Knud Seufert, Johannes V. Barth, Willi Auwärter, Barbara Brena, and Joachim Schnadt

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-20

Beschreibung: Author(s): Olesia Snezhkova, Johann Lüder, Alissa Wiengarten, Shiri R. Burema, Felix Bischoff, Yuanqin He, Jan Rusz, Jan Knudsen, Marie-Laure Bocquet, Knud Seufert, Johannes V. Barth, Willi Auwärter, Barbara Brena, and Joachim Schnadt Subtle changes in the geometric and electronic properties of supported molecules, with a potential impact on the functioning of molecular devices, can typically be imaged by scanning probe microscopy, but their exact origin and nature often remain unclear. Here we show explicitly that the symmetry r… [Phys. Rev. B 92, 075428] Published Wed Aug 19, 2015

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Thermal properties of black and blue phosphorenes from a first-principles quasiharmonic approach (2015)

Yierpan Aierken, Deniz Çakır, Cem Sevik, and Francois M. Peeters

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-20

Beschreibung: Author(s): Yierpan Aierken, Deniz Çakır, Cem Sevik, and Francois M. Peeters Different allotropes of phosphorene are possible of which black and blue phosphorus are the most stable. While blue phosphorus has isotropic properties, black phosphorus is strongly anisotropic in its electronic and optical properties due to its anisotropic crystal structure. In this work, we system… [Phys. Rev. B 92, 081408(R)] Published Wed Aug 19, 2015

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Charge transport in DNA nanowires connected to carbon nanotubes (2015)

Bikan Tan, Miroslav Hodak, Wenchang Lu, and J. Bernholc

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-20

Beschreibung: Author(s): Bikan Tan, Miroslav Hodak, Wenchang Lu, and J. Bernholc DNA is perhaps the worlds most controllable nanowire, with potential applications in nanoelectronics and sensing. However, understanding of its charge transport (CT) properties remains elusive, with experiments reporting a wide range of behaviors from insulating to superconductive. We report extensi… [Phys. Rev. B 92, 075429] Published Wed Aug 19, 2015

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Experimental evidence for non-Abelian gauge potentials in twisted graphene bilayers (2015)

Long-Jing Yin, Jia-Bin Qiao, Wei-Jie Zuo, Wen-Tian Li, and Lin He

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-20

Beschreibung: Author(s): Long-Jing Yin, Jia-Bin Qiao, Wei-Jie Zuo, Wen-Tian Li, and Lin He Non-Abelian gauge potentials are quite relevant in subatomic physics, but they are relatively rare in a condensed matter context. Here we report the experimental evidence for non-Abelian gauge potentials in twisted graphene bilayers by scanning tunneling microscopy and spectroscopy. At a magic twist… [Phys. Rev. B 92, 081406(R)] Published Wed Aug 19, 2015

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Multiqubit gates protected by adiabaticity and dynamical decoupling applicable to donor qubits in silicon (2015)

Wayne M. Witzel, Inès Montaño, Richard P. Muller, and Malcolm S. Carroll

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-20

Beschreibung: Author(s): Wayne M. Witzel, Inès Montaño, Richard P. Muller, and Malcolm S. Carroll We present a strategy for producing multiqubit gates that promise high fidelity with minimal tuning requirements. Our strategy combines gap protection from the adiabatic theorem with dynamical decoupling in a complementary manner. Energy-level transition errors are protected by adiabaticity and rema… [Phys. Rev. B 92, 081407(R)] Published Wed Aug 19, 2015

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Electron-electron interactions in graphene field-induced quantum dots in a high magnetic field (2015)

A. Orlof, A. A. Shylau, and I. V. Zozoulenko

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-21

Beschreibung: Author(s): A. Orlof, A. A. Shylau, and I. V. Zozoulenko We study the effect of electron-electron interaction in graphene quantum dots defined by an external electrostatic potential and a high magnetic field. To account for the electron-electron interaction, we use the Thomas-Fermi approximation and find that electron screening causes the formation of com… [Phys. Rev. B 92, 075431] Published Thu Aug 20, 2015

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The two classes of low-energy spectra in finite carbon nanotubes (2015)

Magdalena Marganska, Piotr Chudzinski, and Milena Grifoni

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-22

Beschreibung: Author(s): Magdalena Marganska, Piotr Chudzinski, and Milena Grifoni We study the spectra of finite-length carbon nanotubes (CNTs) of arbitrary chirality. They divide into two classes, which arise because of different rotational symmetries of the low-energy eigenstates. In one of them (the zigzag class), the spinless spectrum is doubly degenerate and the two states c… [Phys. Rev. B 92, 075433] Published Fri Aug 21, 2015

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Majorana fermions at the edge of superconducting islands (2015)

R. S. Akzyanov, A. L. Rakhmanov, A. V. Rozhkov, and Franco Nori

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-22

Beschreibung: Author(s): R. S. Akzyanov, A. L. Rakhmanov, A. V. Rozhkov, and Franco Nori We investigate the properties of electron states localized at the edge of a superconducting island placed on the surface of a topological insulator in a magnetic field. In such systems, Majorana fermions emerge if an odd number of vortices (or odd multivortex vorticity) is hosted by the island; othe… [Phys. Rev. B 92, 075432] Published Fri Aug 21, 2015

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Charge neutrality in epitaxial graphene on 6H-SiC(0001) via nitrogen intercalation (2015)

Nuala M. Caffrey, Rickard Armiento, Rositsa Yakimova, and Igor A. Abrikosov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-22

Beschreibung: Author(s): Nuala M. Caffrey, Rickard Armiento, Rositsa Yakimova, and Igor A. Abrikosov The electronic properties of epitaxial graphene grown on SiC(0001) are known to be impaired relative to those of freestanding graphene. This is due to the formation of a carbon buffer layer between the graphene layers and the substrate, which causes the graphene layers to become strongly n -doped. Ch… [Phys. Rev. B 92, 081409(R)] Published Fri Aug 21, 2015

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Van Hove singularity and ferromagnetic instability in phosphorene (2015)

A. Ziletti, S. M. Huang, D. F. Coker, and H. Lin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-22

Beschreibung: Author(s): A. Ziletti, S. M. Huang, D. F. Coker, and H. Lin Using Wannier-function-based interpolation techniques, we present compelling numerical evidence for the presence of a saddle-point Van Hove singularity at the Γ point near the phosphorene Fermi energy. We show that in proximity of the Van Hove singularity the spin susceptibility presents the logarit… [Phys. Rev. B 92, 085423] Published Fri Aug 21, 2015

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Hopping conduction via ionic liquid induced silicon surface states (2015)

J. Nelson, K. V. Reich, M. Sammon, B. I. Shklovskii, and A. M. Goldman

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-22

Beschreibung: Author(s): J. Nelson, K. V. Reich, M. Sammon, B. I. Shklovskii, and A. M. Goldman In order to clarify the physics of the gating of solids by ionic liquids (ILs) we have gated lightly doped p -Si, which is so well studied that it can be called the “hydrogen atom of solid state physics” and can be used as a test bed for ionic liquids. We explore the case where the concentration of i… [Phys. Rev. B 92, 085424] Published Fri Aug 21, 2015

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Global multipartite nonlocality and Bell-type inequalities in infinite-size quantum spin chains (2015)

Zhao-Yu Sun, Bin Guo, and Hai-Lin Huang

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-25

Beschreibung: Author(s): Zhao-Yu Sun, Bin Guo, and Hai-Lin Huang In this paper, we characterize the global multipartite nonlocality in one-dimensional infinite-size spin-1/2 chains. For this purpose, we calculate the multipartite nonlocality of n -site subchains, and take the large- n limit. As n increases from 2 to 100, we find that the average revenue and the mar… [Phys. Rev. A 92, 022120] Published Mon Aug 24, 2015

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Hermitian non-Markovian stochastic master equations for quantum dissipative dynamics (2015)

Yun-An Yan and Yun Zhou

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-25

Beschreibung: Author(s): Yun-An Yan and Yun Zhou It remains a challenge for theory to simulate nonperturbative and non-Markovian quantum dissipative dynamics at low temperatures. In this study we suggest a Hermitian non-Markovian stochastic master equation suitable for dissipative dynamics at arbitrary temperatures. The memory effect of the bath i… [Phys. Rev. A 92, 022121] Published Mon Aug 24, 2015

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Radiative heat transfer between a rotating nanoparticle and a plane surface (2015)

Vahid Ameri, Mehdi Shafiei Aporvari, and Fardin Kheirandish

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-13

Beschreibung: Author(s): Vahid Ameri, Mehdi Shafiei Aporvari, and Fardin Kheirandish Based on a microscopic approach, we propose a Lagrangian for the combined system of a rotating dielectric nanoparticle above a plane surface in the presence of electromagnetic vacuum fluctuations. In the framework of canonical quantization, the electromagnetic vacuum field is quantized in the presen… [Phys. Rev. A 92, 022110] Published Wed Aug 12, 2015

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How grain size controls friction and wear in nanocrystalline metals (2015)

Ao Li and Izabela Szlufarska

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-15

Beschreibung: Author(s): Ao Li and Izabela Szlufarska Using molecular simulations we investigated the dependence of friction and wear on grain size in nanocrystalline copper. We found that effects of grain size are coupled to the effects of contact size, resulting in a transition from grain size–sensitive regime to grain size–insensitive regime in fric… [Phys. Rev. B 92, 075418] Published Fri Aug 14, 2015

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Optical study of a doubly negatively charged exciton in a CdTe/ZnTe quantum dot containing a single Mn ^{2+} ion (2015)

T. Smoleński, M. Koperski, M. Goryca, P. Wojnar, P. Kossacki, and T. Kazimierczuk

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-15

Beschreibung: Author(s): T. Smoleński, M. Koperski, M. Goryca, P. Wojnar, P. Kossacki, and T. Kazimierczuk We present a magnetospectroscopic study of a doubly negatively charged exciton X 2 − in a CdTe quantum dot doped with a single Mn 2 + ion. The X 2 − emission leading to the singlet final state of an excited electron pair is demonstrated to consist of six distinct lines corresponding to different projectio… [Phys. Rev. B 92, 085415] Published Thu Aug 13, 2015

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Entangling power and operator entanglement of nonunitary quantum evolutions (2015)

Fan-Zhen Kong, Jun-Long Zhao, Ming Yang, and Zhuo-Liang Cao

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-07-30

Beschreibung: Author(s): Fan-Zhen Kong, Jun-Long Zhao, Ming Yang, and Zhuo-Liang Cao We propose a method to calculate the operator entanglement and entangling power of a noisy nonunitary operation in terms of linear entropy. By decomposing the Kraus operators of noisy evolution as the sum of products of Pauli matrices, we derive the analytical expression of the operator entanglement… [Phys. Rev. A 92, 012127] Published Wed Jul 29, 2015

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Tunneling density of states in quantum dots with anisotropic exchange (2015)

A. U. Sharafutdinov and I. S. Burmistrov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-07-30

Beschreibung: Author(s): A. U. Sharafutdinov and I. S. Burmistrov We reexamine the tunneling density of states in quantum dots and nanoparticles within the model which is an extension of the universal Hamiltonian to the case of uniaxial anisotropic exchange. We derive the exact analytical result for the tunneling density of states in the case of an arbitrary singl… [Phys. Rev. B 92, 035439] Published Wed Jul 29, 2015

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Adsorption of alkali adatoms on graphene supported by the Au/Ni(111) surface (2015)

C. S. Praveen, Simone Piccinin, and Stefano Fabris

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): C. S. Praveen, Simone Piccinin, and Stefano Fabris We study alkali-metal adsorption on supported graphene by means of density-functional-theory calculations that include dispersion corrections. Graphene supported by the Au/Ni(111) surface is an important system for fundamental studies because this surface allows one to support graphene, preserving t… [Phys. Rev. B 92, 075403] Published Mon Aug 03, 2015

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Spin-polarized surface electronic structure of Ta(110): Similarities and differences to W(110) (2015)

B. Engelkamp, H. Wortelen, H. Mirhosseini, A. B. Schmidt, D. Thonig, J. Henk, and M. Donath

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): B. Engelkamp, H. Wortelen, H. Mirhosseini, A. B. Schmidt, D. Thonig, J. Henk, and M. Donath Tantalum and tungsten, direct neighbors in the periodic table, exhibit a very similar electronic structure. Compared with tungsten, however, the bands of tantalum are less occupied due to the lack of one electron. As a consequence, an exceptional Dirac-cone-like surface state, observed below the Fer… [Phys. Rev. B 92, 085401] Published Mon Aug 03, 2015

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Graphene-loaded wire medium for tunable broadband subwavelength imaging (2015)

Ali Forouzmand, Hossein M. Bernety, and Alexander B. Yakovlev

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Ali Forouzmand, Hossein M. Bernety, and Alexander B. Yakovlev In this paper, we demonstrate that a wire medium (WM) slab loaded with graphene sheets enables the enhancement of the near field for subwavelength imaging at terahertz frequencies. The analysis is based on the nonlocal homogenization model for WM with the additional boundary condition at the connect… [Phys. Rev. B 92, 085402] Published Mon Aug 03, 2015

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Closing the detection loophole in tripartite Bell tests using the W state (2015)

Károly F. Pál and Tamás Vértesi

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): Károly F. Pál and Tamás Vértesi We study the problem of closing the detection loophole in three-qubit Bell tests, the experimentally most relevant case beyond the usual bipartite scenario, and show that the minimal detection efficiencies required can be considerably lowered compared to the two-qubit case. The lowest reported detec… [Phys. Rev. A 92, 022103] Published Tue Aug 04, 2015

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Generation of Bell, W, and Greenberger-Horne-Zeilinger states via exceptional points in non-Hermitian quantum spin systems (2015)

C. Li and Z. Song

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-06-09

Beschreibung: Author(s): C. Li and Z. Song We study quantum phase transitions in non-Hermitian XY and transverse-field Ising spin chains, in which the non-Hermiticity arises from the imaginary magnetic field. Analytical and numerical results show that at exceptional points, coalescing eigenstates in these models are close to W , distant Bell,... [Phys. Rev. A 91, 062104] Published Fri Jun 05, 2015

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Distinguishing decoherence from alternative quantum theories by dynamical decoupling (2015)

Christian Arenz, Robin Hillier, Martin Fraas, and Daniel Burgarth

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Christian Arenz, Robin Hillier, Martin Fraas, and Daniel Burgarth A long-standing challenge in the foundations of quantum mechanics is the verification of alternative collapse theories despite their mathematical similarity to decoherence. To this end, we suggest a method based on dynamical decoupling. Experimental observation of nonzero saturation of the decouplin… [Phys. Rev. A 92, 022102] Published Mon Aug 03, 2015

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Many-body Majorana operators and the equivalence of parity sectors (2015)

G. Kells

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): G. Kells The one-dimensional p -wave topological superconductor model with open-boundary conditions is examined in its topological phase. Using the eigenbasis of the noninteracting system I show that, provided the interactions are local and do not result in a closing of the gap, then even and odd parity secto… [Phys. Rev. B 92, 081401(R)] Published Mon Aug 03, 2015

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Threshold displacement energies in graphene and single-walled carbon nanotubes (2015)

Andrew Merrill, Cory D. Cress, Jamie E. Rossi, Nathanael D. Cox, and Brian J. Landi

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Andrew Merrill, Cory D. Cress, Jamie E. Rossi, Nathanael D. Cox, and Brian J. Landi The threshold displacement energy E d has been determined for graphene and 216 different ( n , m ) single-walled carbon nanotube chiralities, with 5 ≤ n ≤ 20 and 0 ≤ m ≤ n , under several model conditions using classical molecular dynamics. The model conditions vary by particle (electron or carbon ion), empirica… [Phys. Rev. B 92, 075404] Published Mon Aug 03, 2015

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Phosphorene analogues: Isoelectronic two-dimensional group-IV monochalcogenides with orthorhombic structure (2015)

Lídia C. Gomes and A. Carvalho

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): Lídia C. Gomes and A. Carvalho The group-IV monochalcogenides SnS, SnSe, GeS, and GeSe form a family within the wider group of semiconductor “phosphorene analogues.” Here, we used first-principles calculations to investigate systematically their structural, electronic, and optical properties, analyzing the changes associated with… [Phys. Rev. B 92, 085406] Published Thu Aug 06, 2015

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Valley entanglement of excitons in monolayers of transition-metal dichalcogenides (2015)

Mikhail Tokman, Yongrui Wang, and Alexey Belyanin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): Mikhail Tokman, Yongrui Wang, and Alexey Belyanin We show that excitons in K and K ′ valleys of transition metal dichalcogenide monolayers can be entangled with respect to their valley degree of freedom by absorbing linearly polarized single photons. This effect does not require any interaction between K and K ′ excitons in contrast to conventional m… [Phys. Rev. B 92, 075409] Published Fri Aug 07, 2015

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Metastable electron-electron states in double-layer graphene structures (2015)

L. L. Marnham and A. V. Shytov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): L. L. Marnham and A. V. Shytov The prototypical exciton model of two interacting Dirac particles in graphene was analyzed in J. Sabio et al. , Phys. Rev. B 81 , 045428 (2010) and it was found that in one of the electron-hole scattering channels the total kinetic energy vanishes, resulting in a singular behavior. We show that this … [Phys. Rev. B 92, 085409] Published Fri Aug 07, 2015

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Fractional quantum Hall effect in graphene: Quantitative comparison between theory and experiment (2015)

Ajit C. Balram, Csaba Tőke, A. Wójs, and J. K. Jain

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): Ajit C. Balram, Csaba Tőke, A. Wójs, and J. K. Jain The observation of extensive fractional quantum Hall states in graphene brings out the possibility of more accurate quantitative comparisons between theory and experiment than previously possible, because of the negligibility of finite width corrections. We obtain an accurate phase diagram for diffe… [Phys. Rev. B 92, 075410] Published Fri Aug 07, 2015

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Magnetoelectronic properties of multilayer black phosphorus (2015)

Yongjin Jiang, Rafael Roldán, Francisco Guinea, and Tony Low

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): Yongjin Jiang, Rafael Roldán, Francisco Guinea, and Tony Low We examine the electronic properties of two-dimensional electron gas in black phosphorus multilayers in the presence of a perpendicular magnetic field, highlighting the role of in-plane anisotropy on various experimental quantities such as ac magnetoconductivity, screening, and magnetoplasmons. We f… [Phys. Rev. B 92, 085408] Published Fri Aug 07, 2015

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Theory of spin-orbit-induced spin relaxation in functionalized graphene (2015)

Jan Bundesmann, Denis Kochan, Fedor Tkatschenko, Jaroslav Fabian, and Klaus Richter

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Jan Bundesmann, Denis Kochan, Fedor Tkatschenko, Jaroslav Fabian, and Klaus Richter We perform a comparative study of the spin relaxation by spin-orbit coupling induced from adatoms (hydrogen and fluorine) in graphene. Two methods are applied, giving consistent results: a full quantum transport simulation of a graphene nanoribbon, and a T -matrix calculation using Green's functions … [Phys. Rev. B 92, 081403(R)] Published Mon Aug 10, 2015

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Anderson localization and topological transition in Chern insulators (2015)

Eduardo V. Castro, M. Pilar López-Sancho, and María A. H. Vozmediano

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Eduardo V. Castro, M. Pilar López-Sancho, and María A. H. Vozmediano We analyze the topological transition and localization evolution of disordered two-dimensional systems with nontrivial topology based on bipartite lattices. Chern insulators with broken time-reversal symmetry show nonstandard behavior for disorder realizations selectively distributed on only one of … [Phys. Rev. B 92, 085410] Published Mon Aug 10, 2015

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Statistics of heat exchange between two resistors (2015)

D. S. Golubev and J. P. Pekola

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): D. S. Golubev and J. P. Pekola We study energy flow between two resistors coupled by an arbitrary linear and lossless electric circuit. We show that the fluctuations of energy transferred between the resistors are determined by random scattering of photons on an effective barrier with frequency dependent transmission probability … [Phys. Rev. B 92, 085412] Published Mon Aug 10, 2015

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Bright and dark singlet excitons via linear and two-photon spectroscopy in monolayer transition-metal dichalcogenides (2015)

Timothy C. Berkelbach, Mark S. Hybertsen, and David R. Reichman

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Timothy C. Berkelbach, Mark S. Hybertsen, and David R. Reichman We discuss the linear and two-photon spectroscopic selection rules for spin-singlet excitons in monolayer transition-metal dichalcogenides. Our microscopic formalism combines a fully k -dependent few-orbital band structure with a many-body Bethe-Salpeter equation treatment of the electron-hole intera… [Phys. Rev. B 92, 085413] Published Mon Aug 10, 2015

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Caustic graphene plasmons with Kelvin angle (2015)

Xihang Shi, Xiao Lin, Fei Gao, Hongyi Xu, Zhaoju Yang, and Baile Zhang

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-12

Beschreibung: Author(s): Xihang Shi, Xiao Lin, Fei Gao, Hongyi Xu, Zhaoju Yang, and Baile Zhang A century-long argument made by Lord Kelvin that all swimming objects have an effective Mach number of 3, corresponding to a Kelvin angle of 19.5° for ship waves, has been challenged recently with the conclusion that the Kelvin angle should gradually transit to the Mach angle as the ship's velocity … [Phys. Rev. B 92, 081404(R)] Published Tue Aug 11, 2015

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Runge-Lenz vector in the Calogero-Coulomb problem (2015)

Tigran Hakobyan and Armen Nersessian

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-13

Beschreibung: Author(s): Tigran Hakobyan and Armen Nersessian We construct the Runge-Lenz vector and the symmetry algebra of the rational Calogero-Coulomb problem using the Dunkl operators. We reveal that they are proper deformations of their Coulomb counterpart. Together with similar correspondence between the Calogero oscillator and oscillator models, this o… [Phys. Rev. A 92, 022111] Published Wed Aug 12, 2015

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Floquet exciton condensation in graphene bilayers (2015)

Chuanyi Zhang, Weifeng Zhang, and Guojun Jin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-15

Beschreibung: Author(s): Chuanyi Zhang, Weifeng Zhang, and Guojun Jin We theoretically study the Floquet exciton condensation, which denotes the exciton condensation under an off-resonant circularly polarized light, in graphene bilayers. The polarized light greatly affects the gap function of the condensate as well as the related physical quantities, e.g., the condens… [Phys. Rev. B 92, 085414] Published Thu Aug 13, 2015

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Electronic transport in graphene with particle-hole-asymmetric disorder (2015)

Max Hering, Martin Schneider, and Piet W. Brouwer

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-15

Beschreibung: Author(s): Max Hering, Martin Schneider, and Piet W. Brouwer We study the conductivity of graphene with a smooth but particle-hole-asymmetric disorder potential. Using perturbation theory for the weak-disorder regime and numerical calculations, we investigate how the particle-hole asymmetry shifts the position of the minimal conductivity away from the Dirac p… [Phys. Rev. B 92, 075415] Published Thu Aug 13, 2015

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Dirac electrons and domain walls: A realization in junctions of ferromagnets and topological insulators (2015)

Yago Ferreiros, F. J. Buijnsters, and M. I. Katsnelson

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-15

Beschreibung: Author(s): Yago Ferreiros, F. J. Buijnsters, and M. I. Katsnelson We study a system of Dirac electrons with finite density of charge carriers coupled to an external electromagnetic field in two spatial dimensions, with a domain wall (DW) mass term. The interface between a thin-film ferromagnet and a three-dimensional topological insulator provides a condensed-matt… [Phys. Rev. B 92, 085416] Published Thu Aug 13, 2015

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Optimized multibeam configuration for observation of QED cascades (2015)

E. G. Gelfer, A. A. Mironov, A. M. Fedotov, V. F. Bashmakov, E. N. Nerush, I. Yu. Kostyukov, and N. B. Narozhny

American Physical Society (APS)

In: Physical Review A

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Beschreibung: Author(s): E. G. Gelfer, A. A. Mironov, A. M. Fedotov, V. F. Bashmakov, E. N. Nerush, I. Yu. Kostyukov, and N. B. Narozhny QED cascades in an intense electromagnetic field can occur if the dynamical quantum parameter χ of a seed electron, which in Compton units coincides with the electron proper acceleration, attains the order of unity. We derive a general expression for χ of an initially slow electron in an arbitrary e… [Phys. Rev. A 92, 022113] Published Thu Aug 13, 2015

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Advantages of nonclassical pointer states in postselected weak measurements (2015)

Yusuf Turek, W. Maimaiti, Yutaka Shikano, Chang-Pu Sun, and M. Al-Amri

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-12

Beschreibung: Author(s): Yusuf Turek, W. Maimaiti, Yutaka Shikano, Chang-Pu Sun, and M. Al-Amri We investigate, within the weak measurement theory, the advantages of nonclassical pointer states over semiclassical ones for coherent, squeezed vacuum, and Schrödinger cat states. These states are utilized as pointer states for the system operator A ̂ with property A ̂ 2 = I ̂ , where I ̂ represents the id… [Phys. Rev. A 92, 022109] Published Tue Aug 11, 2015

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Quantum coherence in multipartite systems (2015)

Yao Yao, Xing Xiao, Li Ge, and C. P. Sun

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-13

Beschreibung: Author(s): Yao Yao, Xing Xiao, Li Ge, and C. P. Sun Within the unified framework of exploiting the relative entropy as a distance measure of quantum correlations, we make explicit the hierarchical structure of quantum coherence, quantum discord, and quantum entanglement in multipartite systems. On this basis, we define a basis-independent measure of … [Phys. Rev. A 92, 022112] Published Wed Aug 12, 2015

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Uniformity of the pseudomagnetic field in strained graphene (2015)

G. J. Verbiest, S. Brinker, and C. Stampfer

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-15

Beschreibung: Author(s): G. J. Verbiest, S. Brinker, and C. Stampfer We present a numerical study on the uniformity of the pseudomagnetic field in graphene as a function of the relative orientation between the graphene lattice and straining directions. We calculated the deformation of a regular micron-sized graphene hexagon by symmetrically displacing three of its ed… [Phys. Rev. B 92, 075417] Published Fri Aug 14, 2015

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Arsenic-bridged magnetic interactions in an emerging two-dimensional FeAs nanostructure on MnAs (2015)

Christian Helman, Valeria Ferrari, and Ana Maria Llois

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-15

Beschreibung: Author(s): Christian Helman, Valeria Ferrari, and Ana Maria Llois The extreme case of an Fe monolayer deposited onto a manganese arsenide (MnAs) substrate is analyzed using density functional theory. We find that an FeAs quasi-two-dimensional antiferromagnetic surface nanostructure emerges. This nanostructure, which is magnetically nearly decoupled from the substr… [Phys. Rev. B 92, 075416] Published Thu Aug 13, 2015

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Electromagnetic force on structured metallic surfaces (2015)

Andrew H. Velzen and Kevin J. Webb

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-09-12

Beschreibung: Author(s): Andrew H. Velzen and Kevin J. Webb We present a method by which the relatively weak electromagnetic force exerted on a surface can be dramatically enhanced. By structuring a metal surface at the nanoscale, we show that the force can be substantially increased over that on the planar metallic surface. The basis for this effect is foun… [Phys. Rev. B 92, 115416] Published Fri Sep 11, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Periodic arrays of intercalated atoms in twisted bilayer graphene: An ab initio investigation (2015)

R. H. Miwa, P. Venezuela, and Eric Suárez Morell

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-09-12

Beschreibung: Author(s): R. H. Miwa, P. Venezuela, and Eric Suárez Morell We have performed an ab initio investigation of transition metals ( TMs = Mo , Ru , Co , and Pt ) embedded in twisted bilayer graphene (tBG) layers. Our total energy results reveal that, triggered by the misalignment between the graphene layers, Mo and Ru atoms may form a quasiperiodic (triangular) array of in… [Phys. Rev. B 92, 115419] Published Fri Sep 11, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Monolayer charge-neutral graphene on platinum with extremely weak electron-phonon coupling (2015)

Wei Yao, Eryin Wang, Ke Deng, Shuzhen Yang, Wenyun Wu, Alexei V. Fedorov, Sung-Kwan Mo, Eike F. Schwier, Mingtian Zheng, Yohei Kojima, Hideaki Iwasawa, Kenya Shimada, Kaili Jiang, Pu Yu, Jia Li, and Shuyun Zhou

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Wei Yao, Eryin Wang, Ke Deng, Shuzhen Yang, Wenyun Wu, Alexei V. Fedorov, Sung-Kwan Mo, Eike F. Schwier, Mingtian Zheng, Yohei Kojima, Hideaki Iwasawa, Kenya Shimada, Kaili Jiang, Pu Yu, Jia Li, and Shuyun Zhou Epitaxial growth of graphene on transition metal substrates is an important route for obtaining large scale graphene. However, the interaction between graphene and the substrate often leads to multiple orientations, distorted graphene band structure, large doping, and strong electron-phonon coupling… [Phys. Rev. B 92, 115421] Published Fri Sep 11, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Effect of gate voltage on spin transport along α-helical protein (2015)

Ting-Rui Pan, Ai-Min Guo, and Qing-Feng Sun

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-09-12

Beschreibung: Author(s): Ting-Rui Pan, Ai-Min Guo, and Qing-Feng Sun Recently, the chiral-induced spin selectivity in molecular systems has attracted extensive interest among the scientific communities. Here, we investigate the effect of the gate voltage on spin-selective electron transport through the α -helical peptide/protein molecule contacted by two nonmagnetic e… [Phys. Rev. B 92, 115418] Published Fri Sep 11, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Deeper insight into phase relations in ultrathin Pb films (2015)

Ro-Ya Liu, Angus Huang, Chien-Chung Huang, Chang-Yeh Lee, Chung-Huang Lin, Cheng-Maw Cheng, Ku-Ding Tsuei, Horng-Tay Jeng, Iwao Matsuda, and S.-J. Tang

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Ro-Ya Liu, Angus Huang, Chien-Chung Huang, Chang-Yeh Lee, Chung-Huang Lin, Cheng-Maw Cheng, Ku-Ding Tsuei, Horng-Tay Jeng, Iwao Matsuda, and S.-J. Tang Films of Pb ( 111 ) with thickness ranging from 1 to 16 monolayers (ML) were grown on Ge ( 111 ) and examined by angle-resolved photoemission spectroscopy. The measured thickness dependences of the work function and surface energy from the same set of samples were both well described by damped sinusoidal … [Phys. Rev. B 92, 115415] Published Fri Sep 11, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Direct imaging of coherent quantum transport in graphene p−n−p junctions (2015)

E. D. Herbschleb, R. K. Puddy, P. Marconcini, J. P. Griffiths, G. A. C. Jones, M. Macucci, C. G. Smith, and M. R. Connolly

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-09-12

Beschreibung: Author(s): E. D. Herbschleb, R. K. Puddy, P. Marconcini, J. P. Griffiths, G. A. C. Jones, M. Macucci, C. G. Smith, and M. R. Connolly We use electrostatic lithography to fabricate a graphene p-n-p junction and exploit the coherence of weakly confined Dirac quasiparticles to image the underlying scattering potential using low-temperature scanning gate microscopy. The tip-induced perturbation to the junction potential modifies the c… [Phys. Rev. B 92, 125414] Published Fri Sep 11, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Waveguiding by a locally resonant metasurface (2015)

A. A. Maznev and V. E. Gusev

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-09-15

Beschreibung: Author(s): A. A. Maznev and V. E. Gusev Dispersion relations for acoustic and electromagnetic waves guided by resonant inclusions located at the surface of an elastic solid or an interface between two media are analyzed theoretically within the effective medium approximation. Oscillators on the surface of an elastic half-space are shown t… [Phys. Rev. B 92, 115422] Published Mon Sep 14, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Intervalley biexcitons and many-body effects in monolayer MoS_{2} (2015)

Edbert J. Sie, Alex J. Frenzel, Yi-Hsien Lee, Jing Kong, and Nuh Gedik

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-09-15

Beschreibung: Author(s): Edbert J. Sie, Alex J. Frenzel, Yi-Hsien Lee, Jing Kong, and Nuh Gedik Interactions between two excitons can result in the formation of bound quasiparticles, known as biexcitons. Their properties are determined by the constituent excitons, with orbital and spin states resembling those of atoms. Monolayer transition metal dichalcogenides (TMDs) present a unique system w… [Phys. Rev. B 92, 125417] Published Mon Sep 14, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Magnetic field control of near-field radiative heat transfer and the realization of highly tunable hyperbolic thermal emitters (2015)

E. Moncada-Villa, V. Fernández-Hurtado, F. J. García-Vidal, A. García-Martín, and J. C. Cuevas

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): E. Moncada-Villa, V. Fernández-Hurtado, F. J. García-Vidal, A. García-Martín, and J. C. Cuevas We present a comprehensive theoretical study of the magnetic field dependence of the near-field radiative heat transfer (NFRHT) between two parallel plates. We show that when the plates are made of doped semiconductors, the near-field thermal radiation can be severely affected by the application of … [Phys. Rev. B 92, 125418] Published Mon Sep 14, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Theory of reflectivity properties of graphene-coated material plates (2015)

G. L. Klimchitskaya, C. C. Korikov, and V. M. Petrov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-09-16

Beschreibung: Author(s): G. L. Klimchitskaya, C. C. Korikov, and V. M. Petrov The theoretical description for the reflectivity properties of dielectric, metal, and semiconductor plates coated with graphene is developed in the framework of the Dirac model. Graphene is described by the polarization tensor allowing the analytic continuation to the real frequency axis. The plate … [Phys. Rev. B 92, 125419] Published Tue Sep 15, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Prediction of a two-dimensional crystalline structure of nitrogen atoms (2015)

V. Ongun Özçelik, O. Üzengi Aktürk, E. Durgun, and S. Ciraci

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-09-16

Beschreibung: Author(s): V. Ongun Özçelik, O. Üzengi Aktürk, E. Durgun, and S. Ciraci Based on first-principles density functional calculations, we predict that nitrogen atoms can form a single-layer, buckled honeycomb structure called nitrogene, which is rigid and stable even above room temperature. This 2D crystalline phase of nitrogen, which corresponds to a local minimum in the B… [Phys. Rev. B 92, 125420] Published Tue Sep 15, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Odd-frequency pairing of interacting Majorana fermions (2015)

Zhoushen Huang, P. Wölfle, and A. V. Balatsky

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-09-16

Beschreibung: Author(s): Zhoushen Huang, P. Wölfle, and A. V. Balatsky Majorana fermions are rising as a promising key component in quantum computation. Although the prevalent approach is to use a quadratic (i.e., noninteracting) Majorana Hamiltonian, when expressed in terms of Dirac fermions, generically the Hamiltonian involves interaction terms. Here we focus on the… [Phys. Rev. B 92, 121404(R)] Published Mon Sep 14, 2015

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In situ characterization of the formation of a mixed conducting phase on the surface of yttria-stabilized zirconia near Pt electrodes (2015)

D. A. Siegel, F. El Gabaly, K. F. McCarty, and N. C. Bartelt

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-09-16

Beschreibung: Author(s): D. A. Siegel, F. El Gabaly, K. F. McCarty, and N. C. Bartelt The electrochemical reactions of solid oxide fuel cells occur in the region where gas-phase species, electrode, and electrolyte coincide. When the electrode is an ionic insulator and the electrolyte is an electronic insulator, this triple phase boundary is assumed to have atomic dimensions. Here we … [Phys. Rev. B 92, 125421] Published Tue Sep 15, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Topologically protected charge transfer along the edge of a chiral p-wave superconductor (2015)

N. V. Gnezdilov, B. van Heck, M. Diez, Jimmy A. Hutasoit, and C. W. J. Beenakker

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-09-16

Beschreibung: Author(s): N. V. Gnezdilov, B. van Heck, M. Diez, Jimmy A. Hutasoit, and C. W. J. Beenakker The Majorana fermions propagating along the edge of a topological superconductor with p x + i p y pairing deliver a shot noise power of 1 2 × e 2 / h per eV of voltage bias. We calculate the full counting statistics of the transferred charge and find that it becomes trinomial in the low-temperature limit, dist… [Phys. Rev. B 92, 121406(R)] Published Tue Sep 15, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Influence of surface electronic structure on quantum friction between Ag(111) slabs (2015)

Vito Despoja, Vyacheslav M. Silkin, Pedro M. Echenique, and Marijan Šunjić

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-09-17

Beschreibung: Author(s): Vito Despoja, Vyacheslav M. Silkin, Pedro M. Echenique, and Marijan Šunjić The theoretical formulation developed in Phys. Rev. B 83 , 205424 (2011) is applied to explore how surface electronic structure modifies the noncontact friction force between two silver slabs. We find that the friction shows three distinct regimes for different thicknesses. For very thin slabs N = 1 – 7 … [Phys. Rev. B 92, 125424] Published Wed Sep 16, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Collision-dominated nonlinear hydrodynamics in graphene (2015)

U. Briskot, M. Schütt, I. V. Gornyi, M. Titov, B. N. Narozhny, and A. D. Mirlin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-09-18

Beschreibung: Author(s): U. Briskot, M. Schütt, I. V. Gornyi, M. Titov, B. N. Narozhny, and A. D. Mirlin We present an effective hydrodynamic theory of electronic transport in graphene in the interaction-dominated regime. We derive the emergent hydrodynamic description from the microscopic Boltzmann kinetic equation taking into account dissipation due to Coulomb interaction and find the viscosity of Di… [Phys. Rev. B 92, 115426] Published Thu Sep 17, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Peeling of multilayer graphene creates complex interlayer sliding patterns (2015)

Topi Korhonen and Pekka Koskinen

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-09-18

Beschreibung: Author(s): Topi Korhonen and Pekka Koskinen Peeling, shearing, and sliding are important mechanical phenomena in van der Waals solids. However, theoretically they have been studied mostly using minimal periodic cells and in the context of accurate quantum simulations. Here we investigate the peeling of large-scale multilayer graphene stacks w… [Phys. Rev. B 92, 115427] Published Thu Sep 17, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Maximizing the purity of a qubit evolving in an anisotropic environment (2015)

Xiaoya Judy Wang, Stefano Chesi, and W. A. Coish

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-09-18

Beschreibung: Author(s): Xiaoya Judy Wang, Stefano Chesi, and W. A. Coish We provide a general method to calculate and maximize the purity of a qubit interacting with an anisotropic non-Markovian environment. Counter to intuition, we find that the purity is often maximized by preparing and storing the qubit in a superposition of noninteracting eigenstates. For a model rel… [Phys. Rev. B 92, 115424] Published Thu Sep 17, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Activation of the violation of the Svetlichny inequality (2015)

Paweł Caban, Andrzej Molenda, and Kamila Trzcińska

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-09-18

Beschreibung: Author(s): Paweł Caban, Andrzej Molenda, and Kamila Trzcińska The phenomenon of superactivation of quantum nonlocality, i.e., the fact that several copies of a local quantum state when processed together can generate nonlocal correlations, has recently attracted much attention. However, this problem was considered mainly in a bipartite scenario (although some … [Phys. Rev. A 92, 032119] Published Thu Sep 17, 2015

Schlagwort(e): Fundamental concepts

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Valley currents and nonlocal resistances of graphene nanostructures with broken inversion symmetry from the perspective of scattering theory (2015)

George Kirczenow

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-09-18

Beschreibung: Author(s): George Kirczenow Valley currents and nonlocal resistances of graphene nanostructures with broken inversion symmetry are considered theoretically in the linear response regime. Scattering state wave functions of electrons entering the nanostructure from the contacts represented by groups of ideal leads are calculated… [Phys. Rev. B 92, 125425] Published Thu Sep 17, 2015

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Nonlinear magnetic dynamics in a nanomagnet–topological insulator heterostructure (2015)

Xiaopeng Duan, Xi-Lai Li, Yuriy G. Semenov, and Ki Wook Kim

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-09-19

Beschreibung: Author(s): Xiaopeng Duan, Xi-Lai Li, Yuriy G. Semenov, and Ki Wook Kim Magnetization dynamics of a nanomagnet, when strongly coupled with a topological insulator (TI) via the proximity interaction, is examined theoretically in the presence of electrical current on the TI surface under realistic transport conditions. Due to the spin-momentum interlock, the magnetic stat… [Phys. Rev. B 92, 115429] Published Fri Sep 18, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Spin-dependent confinement limit of Dirac particles in three dimensions (2015)

Jian-Yuan Cheng

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-09-22

Beschreibung: Author(s): Jian-Yuan Cheng Unanyan, Otterbach, and Fleischhauer [ Phys. Rev. A 79 , 044101 (2009) ] found that the confinement limit of a one-dimensional Dirac particle can be derived from the Dirac equation. The generalization of this problem to three dimensions is discussed in this paper. It shows that the three-dimensional Di… [Phys. Rev. A 92, 032120] Published Fri Sep 18, 2015

Schlagwort(e): Fundamental concepts

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Time-dependent charge renormalization procedure in QED (2015)

Q. Z. Lv, J. Betke, Q. Su, and R. Grobe

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-09-22

Beschreibung: Author(s): Q. Z. Lv, J. Betke, Q. Su, and R. Grobe We examine the formation process of the vacuum polarization cloud around a localized charge with space-time resolution permitting us to view the traditional charge renormalization procedure from a dynamical perspective. The asymptotic steady-state charge cloud found in the long-time limit (after the… [Phys. Rev. A 92, 032121] Published Fri Sep 18, 2015

Schlagwort(e): Fundamental concepts

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Absolute nonlocality via distributed computing without communication (2015)

Ł. Czekaj, M. Pawłowski, T. Vértesi, A. Grudka, M. Horodecki, and R. Horodecki

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-09-22

Beschreibung: Author(s): Ł. Czekaj, M. Pawłowski, T. Vértesi, A. Grudka, M. Horodecki, and R. Horodecki Understanding the role that quantum entanglement plays as a resource in various information processing tasks is one of the crucial goals of quantum information theory. Here we propose an alternative perspective for studying quantum entanglement: distributed computation of functions without communica… [Phys. Rev. A 92, 032122] Published Fri Sep 18, 2015

Schlagwort(e): Fundamental concepts

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Neutral kaons as an open quantum system in a second quantization approach (2015)

Kordian Andrzej Smoliński

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-09-25

Beschreibung: Author(s): Kordian Andrzej Smoliński We have shown that it is possible to formulate the consistent and probability-preserving description of the CP -symmetry-violating evolution of a system of decaying particles. This has been done within the framework of quantum mechanics of open systems. This approach allows the description of both th… [Phys. Rev. A 92, 032128] Published Thu Sep 24, 2015

Schlagwort(e): Fundamental concepts

Print ISSN: 1050-2947

Digitale ISSN: 1094-1622

Thema: Physik

Publiziert von American Physical Society (APS)

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Limited preparation contextuality in quantum theory and its relation to the Cirel'son bound (2015)

Manik Banik, Some Sankar Bhattacharya, Amit Mukherjee, Arup Roy, Andris Ambainis, and Ashutosh Rai

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-09-25

Beschreibung: Author(s): Manik Banik, Some Sankar Bhattacharya, Amit Mukherjee, Arup Roy, Andris Ambainis, and Ashutosh Rai The Kochen–Specker (KS) theorem lies at the heart of the foundations of quantum mechanics. It establishes the impossibility of explaining predictions of quantum theory by any noncontextual ontological model. Spekkens generalized the notion of KS contextuality in [ Phys. Rev. A 71 , 052108 (2005) ] for … [Phys. Rev. A 92, 030103(R)] Published Thu Sep 24, 2015

Schlagwort(e): Fundamental concepts

Print ISSN: 1050-2947

Digitale ISSN: 1094-1622

Thema: Physik

Publiziert von American Physical Society (APS)

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Nonperturbative renormalization group calculation of quasiparticle velocity and dielectric function of graphene (2015)

Carsten Bauer, Andreas Rückriegel, Anand Sharma, and Peter Kopietz

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-09-25

Beschreibung: Author(s): Carsten Bauer, Andreas Rückriegel, Anand Sharma, and Peter Kopietz Using a nonperturbative functional renormalization group approach, we calculate the renormalized quasiparticle velocity v ( k ) and the static dielectric function ε ( k ) of suspended graphene as functions of an external momentum k . Our numerical result for v ( k ) can be fitted by v ( k ) / v F = A + B ln ( Λ 0 / k ) , where… [Phys. Rev. B 92, 121409(R)] Published Thu Sep 24, 2015

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

Print ISSN: 1098-0121

Digitale ISSN: 1095-3795

Thema: Physik

Publiziert von American Physical Society (APS)

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