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Unveiling the structural origin of the high carrier mobility of a molecular monolayer on boron nitride (2014)

Rui Xu, Daowei He, Yuhan Zhang, Bing Wu, Fengyuan Liu, Lan Meng, Jun-Fang Liu, Qisheng Wu, Yi Shi, Jinlan Wang, Jia-Cai Nie, Xinran Wang, and Lin He

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-12-13

Description: Author(s): Rui Xu, Daowei He, Yuhan Zhang, Bing Wu, Fengyuan Liu, Lan Meng, Jun-Fang Liu, Qisheng Wu, Yi Shi, Jinlan Wang, Jia-Cai Nie, Xinran Wang, and Lin He Very recently, it was demonstrated that the carrier mobility of a molecular monolayer dioctylbenzothienobenzothiophene (C 8 -BTBT) on boron nitride can reach 10 cm 2 /Vs, the highest among the previously reported monolayer molecular field-effect transistors. Here we show that the high-quality single cry... [Phys. Rev. B 90, 224106] Published Fri Dec 12, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Fast radio bursts and white hole signals (2014)

Aurélien Barrau, Carlo Rovelli, and Francesca Vidotto

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2014-12-18

Description: Author(s): Aurélien Barrau, Carlo Rovelli, and Francesca Vidotto Quantum gravity effects could make a black hole explode in a time shorter than the Hawking radiation time, via local tunneling through a white hole solution. Here we estimate the size of a primordial black hole exploding today via this process, using a simple generic model. Fast radio bursts, strong... [Phys. Rev. D 90, 127503] Published Wed Dec 17, 2014

Keywords: General relativity, gravitation

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Stabilization and Manipulation of Electronically Phase-Separated Ground States in Defective Indium Atom Wires on Silicon (2014)

Hui Zhang, Fangfei Ming, Hyun-Jung Kim, Hongbin Zhu, Qiang Zhang, Hanno H. Weitering, Xudong Xiao, Changgan Zeng, Jun-Hyung Cho, and Zhenyu Zhang

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-11-07

Description: Author(s): Hui Zhang, Fangfei Ming, Hyun-Jung Kim, Hongbin Zhu, Qiang Zhang, Hanno H. Weitering, Xudong Xiao, Changgan Zeng, Jun-Hyung Cho, and Zhenyu Zhang Exploration and manipulation of electronic states in low-dimensional systems are of great importance in the fundamental and practical aspects of nanomaterial and nanotechnology. Here, we demonstrate that the incorporation of vacancy defects into monatomic indium wires on n-type Si(111) can stabilize... [Phys. Rev. Lett. 113, 196802] Published Thu Nov 06, 2014

Keywords: Condensed Matter: Electronic Properties, etc.

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Noncoplanar and Counterrotating Incommensurate Magnetic Order Stabilized by Kitaev Interactions in γ-Li2IrO3 (2014)

A. Biffin, R. D. Johnson, I. Kimchi, R. Morris, A. Bombardi, J. G. Analytis, A. Vishwanath, and R. Coldea

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-11-07

Description: Author(s): A. Biffin, R. D. Johnson, I. Kimchi, R. Morris, A. Bombardi, J. G. Analytis, A. Vishwanath, and R. Coldea Materials that realize Kitaev spin models with bond-dependent anisotropic interactions have long been searched for, as the resulting frustration effects are predicted to stabilize novel forms of magnetic order or quantum spin liquids. Here, we explore the magnetism of γ-Li2IrO3, which has the topolo... [Phys. Rev. Lett. 113, 197201] Published Thu Nov 06, 2014

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Revealing Topological Superconductivity in Extended Quantum Spin Hall Josephson Junctions (2014)

Shu-Ping Lee, Karen Michaeli, Jason Alicea, and Amir Yacoby

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-11-07

Description: Author(s): Shu-Ping Lee, Karen Michaeli, Jason Alicea, and Amir Yacoby Quantum spin Hall–superconductor hybrids are promising sources of topological superconductivity and Majorana modes, particularly given recent progress on HgTe and InAs/GaSb. We propose a new method of revealing topological superconductivity in extended quantum spin Hall Josephson junctions supportin... [Phys. Rev. Lett. 113, 197001] Published Thu Nov 06, 2014

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What Determines the Fermi Wave Vector of Composite Fermions? (2014)

D. Kamburov, Yang Liu, M. A. Mueed, M. Shayegan, L. N. Pfeiffer, K. W. West, and K. W. Baldwin

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-11-07

Description: Author(s): D. Kamburov, Yang Liu, M. A. Mueed, M. Shayegan, L. N. Pfeiffer, K. W. West, and K. W. Baldwin Composite fermions (CFs), exotic particles formed by pairing an even number of flux quanta to each electron, provide a fascinating description of phenomena exhibited by interacting two-dimensional electrons at high magnetic fields. At and near Landau level filling ν=1/2, CFs occupy a Fermi sea and e... [Phys. Rev. Lett. 113, 196801] Published Thu Nov 06, 2014

Keywords: Condensed Matter: Electronic Properties, etc.

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Equilibrium solutions of relativistic rotating stars with mixed poloidal and toroidal magnetic fields (2014)

Kōji Uryū, Eric Gourgoulhon, Charalampos M. Markakis, Kotaro Fujisawa, Antonios Tsokaros, and Yoshiharu Eriguchi

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2014-11-08

Description: Author(s): Kōji Uryū, Eric Gourgoulhon, Charalampos M. Markakis, Kotaro Fujisawa, Antonios Tsokaros, and Yoshiharu Eriguchi Stationary and axisymmetric solutions of relativistic rotating stars with strong mixed poloidal and toroidal magnetic fields are obtained numerically. Because of the mixed components of the magnetic field, the underlying stationary and axisymmetric spacetimes are no longer circular. These configurat... [Phys. Rev. D 90, 101501] Published Fri Nov 07, 2014

Keywords: General relativity, gravitation

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Manipulation and Characterization of Aperiodical Graphene Structures Created in a Two-Dimensional Electron Gas (2014)

Shiyong Wang, Liang Z. Tan, Weihua Wang, Steven G. Louie, and Nian Lin

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-11-08

Description: Author(s): Shiyong Wang, Liang Z. Tan, Weihua Wang, Steven G. Louie, and Nian Lin We demonstrate that Dirac fermions can be created and manipulated in a two-dimensional electron gas (2DEG). Using a cryogenic scanning tunneling microscope, we arranged coronene molecules one by one on a Cu(111) surface to construct artificial graphene nanoribbons with perfect zigzag (ZGNRs) or arm-... [Phys. Rev. Lett. 113, 196803] Published Fri Nov 07, 2014

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Vaporization of Kitaev Spin Liquids (2014)

Joji Nasu, Masafumi Udagawa, and Yukitoshi Motome

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-11-08

Description: Author(s): Joji Nasu, Masafumi Udagawa, and Yukitoshi Motome The quantum spin liquid is an exotic quantum state of matter in magnets. This state is a spin analog of liquid helium that does not solidify down to the lowest temperature due to strong quantum fluctuations. In conventional fluids, the liquid and gas possess the same symmetry and adiabatically conne... [Phys. Rev. Lett. 113, 197205] Published Fri Nov 07, 2014

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Fractionalized Charge Excitations in a Spin Liquid on Partially Filled Pyrochlore Lattices (2014)

Gang Chen, Hae-Young Kee, and Yong Baek Kim

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-11-08

Description: Author(s): Gang Chen, Hae-Young Kee, and Yong Baek Kim We study the Mott transition from a metal to cluster Mott insulators in the 1/4- and Please note that APS made slight change to the title of the paper1/8-filled pyrochlore lattice systems. It is shown that such Mott transitions can arise due to charge localization in clusters or in tetrahedron units... [Phys. Rev. Lett. 113, 197202] Published Fri Nov 07, 2014

Keywords: Condensed Matter: Electronic Properties, etc.

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Sufficient Condition for Entanglement Area Laws in Thermodynamically Gapped Spin Systems (2014)

Jaeyoon Cho

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-11-08

Description: Author(s): Jaeyoon Cho We consider general locally interacting arbitrary-dimensional lattice spin systems that are gapped for any system size. We show under reasonable conditions that nondegenerate ground states of such systems obey the entanglement area law. In so doing, we offer an intuitive picture on how a spectral ga... [Phys. Rev. Lett. 113, 197204] Published Fri Nov 07, 2014

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Full Control of the Spin-Wave Damping in a Magnetic Insulator Using Spin-Orbit Torque (2014)

A. Hamadeh, O. d’Allivy Kelly, C. Hahn, H. Meley, R. Bernard, A. H. Molpeceres, V. V. Naletov, M. Viret, A. Anane, V. Cros, S. O. Demokritov, J. L. Prieto, M. Muñoz, G. de Loubens, and O. Klein

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-11-08

Description: Author(s): A. Hamadeh, O. d’Allivy Kelly, C. Hahn, H. Meley, R. Bernard, A. H. Molpeceres, V. V. Naletov, M. Viret, A. Anane, V. Cros, S. O. Demokritov, J. L. Prieto, M. Muñoz, G. de Loubens, and O. Klein It is demonstrated that the threshold current for damping compensation can be reached in a 5 μm diameter YIG(20 nm)|Pt(7 nm) disk. The demonstration rests upon the measurement of the ferromagnetic resonance linewidth as a function of Idc using a magnetic resonance force microscope (MRFM). It is s... [Phys. Rev. Lett. 113, 197203] Published Fri Nov 07, 2014

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Magnetic Resonance Detection of Individual Proton Spins Using Quantum Reporters (2014)

A. O. Sushkov, I. Lovchinsky, N. Chisholm, R. L. Walsworth, H. Park, and M. D. Lukin

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-11-04

Description: Author(s): A. O. Sushkov, I. Lovchinsky, N. Chisholm, R. L. Walsworth, H. Park, and M. D. Lukin An NMR scheme based on nitrogen vacancies in diamond images the spins of individual protons. [Phys. Rev. Lett. 113, 197601] Published Mon Nov 03, 2014

Keywords: Condensed Matter: Electronic Properties, etc.

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Impact of deformation on the atomic structures and dynamics of a Cu-Zr metallic glass: A molecular dynamics study (2014)

Y. Zhang, M. I. Mendelev, C. Z. Wang, R. Ott, F. Zhang, M. F. Besser, K. M. Ho, and M. J. Kramer

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-11-04

Description: Author(s): Y. Zhang, M. I. Mendelev, C. Z. Wang, R. Ott, F. Zhang, M. F. Besser, K. M. Ho, and M. J. Kramer Despite numerous studies on the atomic structures of Cu-Zr metallic glasses (MGs), their inherent structural ordering, e.g., medium-range order (MRO), remains difficult to describe. Specifically lacking is an understanding of how the MRO responds to deformation and the associated changes in atomic m... [Phys. Rev. B 90, 174101] Published Mon Nov 03, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Spin-Electricity Conversion Induced by Spin Injection into Topological Insulators (2014)

Y. Shiomi, K. Nomura, Y. Kajiwara, K. Eto, M. Novak, Kouji Segawa, Yoichi Ando, and E. Saitoh

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-11-04

Description: Author(s): Y. Shiomi, K. Nomura, Y. Kajiwara, K. Eto, M. Novak, Kouji Segawa, Yoichi Ando, and E. Saitoh We report successful spin injection into the surface states of topological insulators by using a spin pumping technique. By measuring the voltage that shows up across the samples as a result of spin pumping, we demonstrate that a spin-electricity conversion effect takes place in the surface states o... [Phys. Rev. Lett. 113, 196601] Published Mon Nov 03, 2014

Keywords: Condensed Matter: Electronic Properties, etc.

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Solute-defect interactions in Al-Mg alloys from diffusive variational Gaussian calculations (2014)

E. Dontsova, J. Rottler, and C. W. Sinclair

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-11-06

Description: Author(s): E. Dontsova, J. Rottler, and C. W. Sinclair Resolving atomic-scale defect topologies and energetics with accurate atomistic interaction models provides access to the nonlinear phenomena inherent at atomic length and time scales. Coarse graining the dynamics of such simulations to look at the migration of, e.g., solute atoms, while retaining t... [Phys. Rev. B 90, 174102] Published Wed Nov 05, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Asymmetric Frequency Conversion in Nonlinear Systems Driven by a Biharmonic Pump (2014)

Archana Kamal, Ananda Roy, John Clarke, and Michel H. Devoret

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-12-12

Description: Author(s): Archana Kamal, Ananda Roy, John Clarke, and Michel H. Devoret A novel mechanism of asymmetric frequency conversion is investigated in nonlinear dispersive devices driven parametrically with a biharmonic pump. When the relative phase between the first and second harmonics combined in a two-tone pump is appropriately tuned, nonreciprocal frequency conversion, ei... [Phys. Rev. Lett. 113, 247003] Published Thu Dec 11, 2014

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Prediction of Near-Room-Temperature Quantum Anomalous Hall Effect on Honeycomb Materials (2014)

Shu-Chun Wu, Guangcun Shan, and Binghai Yan

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-12-16

Description: Author(s): Shu-Chun Wu, Guangcun Shan, and Binghai Yan Recently, the long-sough quantum anomalous Hall effect was realized in a magnetic topological insulator. However, the requirement of an extremely low temperature (approximately 30 mK) hinders realistic applications. Based on ab initio band structure calculations, we propose a quantum anomalous Hall ... [Phys. Rev. Lett. 113, 256401] Published Mon Dec 15, 2014

Keywords: Condensed Matter: Electronic Properties, etc.

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Shallow halogen vacancies in halide optoelectronic materials (2014)

Hongliang Shi and Mao-Hua Du

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-11-06

Description: Author(s): Hongliang Shi and Mao-Hua Du Halogen vacancies (VH) are usually deep color centers (F centers) in halides and can act as major electron traps or recombination centers. The deep VH contributes to the typically poor carrier transport properties in halides. However, several halides have recently emerged as excellent optoelectronic... [Phys. Rev. B 90, 174103] Published Wed Nov 05, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Circular-Polarization-Sensitive Metamaterial Based on Triple-Quantum-Dot Molecules (2014)

Panagiotis Kotetes, Pei-Qing Jin, Michael Marthaler, and Gerd Schön

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-12-03

Description: Author(s): Panagiotis Kotetes, Pei-Qing Jin, Michael Marthaler, and Gerd Schön We propose a new type of chiral metamaterial based on an ensemble of artificial molecules formed by three identical quantum dots in a triangular arrangement. A static magnetic field oriented perpendicular to the plane breaks mirror symmetry, rendering the molecules sensitive to the circular polariza... [Phys. Rev. Lett. 113, 236801] Published Tue Dec 02, 2014

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Hawking radiation with dispersion: The broadened horizon paradigm (2014)

Antonin Coutant and Renaud Parentani

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2014-12-04

Description: Author(s): Antonin Coutant and Renaud Parentani To identify what replaces the key notion of black hole horizon when working with theories which break Lorentz invariance at high energy, we study the modes responsible for the Hawking effect in the presence of high frequency dispersion. We show that they are regularized across the horizon over a sho... [Phys. Rev. D 90, 121501] Published Wed Dec 03, 2014

Keywords: General relativity, gravitation

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Effective Theory of Floquet Topological Transitions (2014)

Arijit Kundu, H. A. Fertig, and Babak Seradjeh

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-12-04

Description: Author(s): Arijit Kundu, H. A. Fertig, and Babak Seradjeh We develop a theory of topological transitions in a Floquet topological insulator, using graphene irradiated by circularly polarized light as a concrete realization. We demonstrate that a hallmark signature of such transitions in a static system, i.e., metallic bulk transport with conductivity of or... [Phys. Rev. Lett. 113, 236803] Published Wed Dec 03, 2014

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Noncollinear Paramagnetism of a GaAs Two-Dimensional Hole System (2014)

L. A. Yeoh, A. Srinivasan, O. Klochan, R. Winkler, U. Zülicke, M. Y. Simmons, D. A. Ritchie, M. Pepper, and A. R. Hamilton

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-12-04

Description: Author(s): L. A. Yeoh, A. Srinivasan, O. Klochan, R. Winkler, U. Zülicke, M. Y. Simmons, D. A. Ritchie, M. Pepper, and A. R. Hamilton We have performed transport measurements in tilted magnetic fields in a two-dimensional hole system grown on the surface of a (311)A GaAs crystal. A striking asymmetry of Shubnikov–de Haas oscillations occurs upon reversing the in-plane component of the magnetic field along the low-symmetry [2̅ ... [Phys. Rev. Lett. 113, 236401] Published Wed Dec 03, 2014

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Fibonacci Anyons From Abelian Bilayer Quantum Hall States (2014)

Abolhassan Vaezi and Maissam Barkeshli

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-12-04

Description: Author(s): Abolhassan Vaezi and Maissam Barkeshli The possibility of realizing non-Abelian statistics and utilizing it for topological quantum computation (TQC) has generated widespread interest. However, the non-Abelian statistics that can be realized in most accessible proposals is not powerful enough for universal TQC. In this Letter, we conside... [Phys. Rev. Lett. 113, 236804] Published Wed Dec 03, 2014

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Magnetism of Ho and Er Atoms on Close-Packed Metal Surfaces (2014)

F. Donati, A. Singha, S. Stepanow, C. Wäckerlin, J. Dreiser, P. Gambardella, S. Rusponi, and H. Brune

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-12-04

Description: Author(s): F. Donati, A. Singha, S. Stepanow, C. Wäckerlin, J. Dreiser, P. Gambardella, S. Rusponi, and H. Brune We investigated the magnetic properties of individual Ho atoms adsorbed on the (111) surface of Pt, which have been recently claimed to display single ion magnetic behavior. By combining x-ray absorption spectroscopy and magnetic dichroism measurements with ligand field multiplet calculations, we re... [Phys. Rev. Lett. 113, 237201] Published Wed Dec 03, 2014

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Quantum Spin Dimers from Chiral Dissipation in Cold-Atom Chains (2014)

Tomás Ramos, Hannes Pichler, Andrew J. Daley, and Peter Zoller

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-12-04

Description: Author(s): Tomás Ramos, Hannes Pichler, Andrew J. Daley, and Peter Zoller We consider the nonequilibrium dynamics of a driven dissipative spin chain with chiral coupling to a one-dimensional (1D) bosonic bath, and its atomic implementation with a two-species mixture of cold quantum gases. The reservoir is represented by a spin-orbit coupled 1D quasicondensate of atoms in ... [Phys. Rev. Lett. 113, 237203] Published Wed Dec 03, 2014

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Magnetic Damping: Domain Wall Dynamics versus Local Ferromagnetic Resonance (2014)

T. Weindler, H. G. Bauer, R. Islinger, B. Boehm, J.-Y. Chauleau, and C. H. Back

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-12-04

Description: Author(s): T. Weindler, H. G. Bauer, R. Islinger, B. Boehm, J.-Y. Chauleau, and C. H. Back Magnetic relaxation is one of the dominating features of magnetization dynamics. Depending on the magnetic structure and the experimental approach, different magnitudes of the damping parameter are reported even for a given material. In this study, we experimentally address this issue by accessing t... [Phys. Rev. Lett. 113, 237204] Published Wed Dec 03, 2014

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Protecting a Solid-State Spin from Decoherence Using Dressed Spin States (2014)

D. Andrew Golter, Thomas K. Baldwin, and Hailin Wang

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-12-04

Description: Author(s): D. Andrew Golter, Thomas K. Baldwin, and Hailin Wang We report experimental studies of dressing an electron spin in diamond with resonant and continuous microwave fields to protect the electron spin from magnetic fluctuations induced by the nuclear spin bath. We use optical coherent population trapping (CPT) to probe the energy level structure, optica... [Phys. Rev. Lett. 113, 237601] Published Wed Dec 03, 2014

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Are Hydrogen-Bonded Charge Transfer Crystals Room Temperature Ferroelectrics? (2014)

Gabriele D’Avino and Matthieu J. Verstraete

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-12-04

Description: Author(s): Gabriele D’Avino and Matthieu J. Verstraete We present a theoretical investigation of the anomalous ferroelectricity of mixed-stack charge transfer molecular crystals, based on the Peierls-Hubbard model, and first-principles calculations for its parametrization. This approach is first validated by reproducing the temperature-induced transitio... [Phys. Rev. Lett. 113, 237602] Published Wed Dec 03, 2014

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Quantum Selection of Order in an XXZ Antiferromagnet on a Kagome Lattice (2014)

A. L. Chernyshev and M. E. Zhitomirsky

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-12-04

Description: Author(s): A. L. Chernyshev and M. E. Zhitomirsky Selection of the ground state of the kagome-lattice XXZ antiferromagnet by quantum fluctuations is investigated by combining nonlinear spin-wave and real-space perturbation theories. The two methods unanimously favor q =0 over √ 3 ×√ 3 magnetic order in a wide range of the anisotropy parameter 0≤Δ≲0.72.... [Phys. Rev. Lett. 113, 237202] Published Wed Dec 03, 2014

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Calorimetric and acoustic emission study of martensitic transformation in single-crystalline Ni_{2}MnGa alloys (2014)

László Z. Tóth, Sándor Szabó, Lajos Daróczi, and Dezső L. Beke

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-12-05

Description: Author(s): László Z. Tóth, Sándor Szabó, Lajos Daróczi, and Dezső L. Beke The jerky character of austenite-martensite phase transformation in Ni 2 MnGa single crystals (with 10M martensite structure) has been investigated by thermal cycling using a differential scanning calorimeter (DSC) and by detection of acoustic emissions (AEs) at low cooling and heating rates (0.1 K/mi... [Phys. Rev. B 90, 224103] Published Thu Dec 04, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Spin-Orbit Fluctuations in Frustrated Heavy-Fermion Metal LiV_{2}O_{4} (2014)

K. Tomiyasu, K. Iwasa, H. Ueda, S. Niitaka, H. Takagi, S. Ohira-Kawamura, T. Kikuchi, Y. Inamura, K. Nakajima, and K. Yamada

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-12-05

Description: Author(s): K. Tomiyasu, K. Iwasa, H. Ueda, S. Niitaka, H. Takagi, S. Ohira-Kawamura, T. Kikuchi, Y. Inamura, K. Nakajima, and K. Yamada Spin fluctuations were studied over a wide momentum (ℏQ) and energy (E) space in the frustrated d-electron heavy-fermion metal LiV 2 O 4 by time-of-flight inelastic neutron scattering. We observed the overall Q−E evolutions near the characteristic Q=0.6 Å -1 peak and found another weak broad magnetic ... [Phys. Rev. Lett. 113, 236402] Published Thu Dec 04, 2014

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Electrical Spin Injection into High Mobility 2D Systems (2014)

M. Oltscher, M. Ciorga, M. Utz, D. Schuh, D. Bougeard, and D. Weiss

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-12-05

Description: Author(s): M. Oltscher, M. Ciorga, M. Utz, D. Schuh, D. Bougeard, and D. Weiss The injection of spins into a high-mobility two-dimensional electron gas is unexpectedly efficient, suggesting that new theories may be needed to describe spin transport in such systems. [Phys. Rev. Lett. 113, 236602] Published Thu Dec 04, 2014

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Fermi-Liquid Computation of the Phase Diagram of High-Tc Cuprate Superconductors with an Orbital Antiferromagnetic Pseudogap (2014)

R. B. Laughlin

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-01-11

Description: Author(s): R. B. Laughlin A 4-parameter Fermi-liquid calculation of the high-Tc cuprate phase diagram is reported. Simultaneously accounted for are the special doping densities of 5% and 16%, the d-wave functional form of the (orbital antiferromagnetic) pseudogap, the measured Tc, superconducting gap, pseudogap and superflui... [Phys. Rev. Lett. 112, 017004] Published Fri Jan 10, 2014

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Spin and Orbital Contributions to Magnetically Ordered Moments in 5d Layered Perovskite Sr2IrO4 (2014)

S. Fujiyama, H. Ohsumi, K. Ohashi, D. Hirai, B. J. Kim, T. Arima, M. Takata, and H. Takagi

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-01-11

Description: Author(s): S. Fujiyama, H. Ohsumi, K. Ohashi, D. Hirai, B. J. Kim, T. Arima, M. Takata, and H. Takagi The ratio of orbital (L) and spin (S) contributions to the magnetically ordered moments of a 5d transition metal oxide, Sr2IrO4 was evaluated by nonresonant magnetic x-ray diffraction. We applied an improved experimental setting that minimized the experimental error, in which we varied only the line... [Phys. Rev. Lett. 112, 016405] Published Fri Jan 10, 2014

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Magnetic Field Induced Transition in Vanadium Spinels (2014)

E. D. Mun, Gia-Wei Chern, V. Pardo, F. Rivadulla, R. Sinclair, H. D. Zhou, V. S. Zapf, and C. D. Batista

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-01-11

Description: Author(s): E. D. Mun, Gia-Wei Chern, V. Pardo, F. Rivadulla, R. Sinclair, H. D. Zhou, V. S. Zapf, and C. D. Batista We study vanadium spinels AV2O4(A=Cd,Mg) in pulsed magnetic fields up to 65 T. A jump in magnetization at μ0H≈40 T is observed in the single-crystal MgV2O4, indicating a field induced quantum phase transition between two distinct magnetic orders. In the multiferroic CdV2O4, the field induced transi... [Phys. Rev. Lett. 112, 017207] Published Fri Jan 10, 2014

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Anomalous Hall Effect Arising from Noncollinear Antiferromagnetism (2014)

Hua Chen, Qian Niu, and A. H. Mac; Donald

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-01-11

Description: Author(s): Hua Chen, Qian Niu, and A. H. MacDonald As established in the very early work of Edwin Hall, ferromagnetic conductors have an anomalous Hall conductivity contribution that cannot be attributed to Lorentz forces and therefore survives in the absence of a magnetic field. These anomalous Hall conductivities are normally assumed to be proport... [Phys. Rev. Lett. 112, 017205] Published Fri Jan 10, 2014

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Topologically Protected Conduction State at Carbon Foam Surfaces: An Ab initio Study (2014)

Zhen Zhu, Zacharias G. Fthenakis, Jie Guan, and David Tománek

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-01-15

Description: Author(s): Zhen Zhu, Zacharias G. Fthenakis, Jie Guan, and David Tománek We report results of ab initio electronic structure and quantum conductance calculations indicating the emergence of conduction at the surface of semiconducting carbon foams. The occurrence of new conduction states is intimately linked to the topology of the surface and not limited to foams of eleme... [Phys. Rev. Lett. 112, 026803] Published Tue Jan 14, 2014

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Coherent Operations and Screening in Multielectron Spin Qubits (2014)

A. P. Higginbotham, F. Kuemmeth, M. P. Hanson, A. C. Gossard, and C. M. Marcus

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-01-15

Description: Author(s): A. P. Higginbotham, F. Kuemmeth, M. P. Hanson, A. C. Gossard, and C. M. Marcus Multielectron spin qubits are demonstrated, and performance examined by comparing coherent exchange oscillations in coupled single-electron and multielectron quantum dots, measured in the same device. Fast (〉1 GHz) exchange oscillations with a quality factor Q∼15 are found for the multielectron ... [Phys. Rev. Lett. 112, 026801] Published Tue Jan 14, 2014

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From Dia- to Paramagnetic Orbital Susceptibility of Massless Fermions (2014)

A. Raoux, M. Morigi, J.-N. Fuchs, F. Piéchon, and G. Montambaux

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-01-15

Description: Author(s): A. Raoux, M. Morigi, J.-N. Fuchs, F. Piéchon, and G. Montambaux We study the orbital susceptibility of multiband systems with a pair of Dirac points interpolating between honeycomb and dice lattices. Despite having the same zero-field energy spectrum, these different systems exhibit spectacular differences in their orbital magnetic response, ranging from dia- to... [Phys. Rev. Lett. 112, 026402] Published Tue Jan 14, 2014

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Order, Criticality, and Excitations in the Extended Falicov-Kimball Model (2014)

S. Ejima, T. Kaneko, Y. Ohta, and H. Fehske

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-01-14

Description: Author(s): S. Ejima, T. Kaneko, Y. Ohta, and H. Fehske Using exact numerical techniques, we investigate the nature of excitonic (electron-hole) bound states and the development of exciton coherence in the one-dimensional half-filled extended Falicov-Kimball model. The ground-state phase diagram of the model exhibits, besides band-insulator and staggered... [Phys. Rev. Lett. 112, 026401] Published Mon Jan 13, 2014

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Ab initio modeling of the two-dimensional energy landscape of screw dislocations in bcc transition metals (2014)

L. Dezerald, Lisa Ventelon, E. Clouet, C. Denoual, D. Rodney, and F. Willaime

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-01-16

Description: Author(s): L. Dezerald, Lisa Ventelon, E. Clouet, C. Denoual, D. Rodney, and F. Willaime A density functional theory (DFT) study of the 1/2〈111〉 screw dislocation was performed in the following body-centered cubic transition metals: V, Nb, Ta, Cr, Mo, W, and Fe. The energies of the easy, hard, and split core configurations, as well as the pathways between them, were investigated and use... [Phys. Rev. B 89, 024104] Published Wed Jan 15, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Effect of Electron-Phonon Interactions on Orbital Fluctuations in Iron-Based Superconductors (2014)

Yusuke Nomura, Kazuma Nakamura, and Ryotaro Arita

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-01-16

Description: Author(s): Yusuke Nomura, Kazuma Nakamura, and Ryotaro Arita To investigate the possibility of whether electron-phonon coupling can enhance orbital fluctuations in iron-based superconductors, we develop an ab initio method to construct the effective low-energy models including the phonon-related terms. With the derived effective electron-phonon interactions a... [Phys. Rev. Lett. 112, 027002] Published Wed Jan 15, 2014

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Resonant X-Ray Scattering and the jeff=1/2 Electronic Ground State in Iridate Perovskites (2014)

M. Moretti Sala, S. Boseggia, D. F. McMorrow, and G. Monaco

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-01-16

Description: Author(s): M. Moretti Sala, S. Boseggia, D. F. McMorrow, and G. Monaco The resonant x-ray scattering (magnetic elastic, RXMS, and inelastic, RIXS) of Ir4+ at the L2,3 edges relevant to spin-orbit Mott insulators An+1IrnO3n+1 (A=Sr, Ba, etc.) are calculated using a single-ion model which treats the spin-orbit and tetragonal crystal-field terms on an equal footing. Both ... [Phys. Rev. Lett. 112, 026403] Published Wed Jan 15, 2014

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Observation of Edge Transport in the Disordered Regime of Topologically Insulating InAs/GaSb Quantum Wells (2014)

Ivan Knez, Charles T. Rettner, See-Hun Yang, Stuart S. P. Parkin, Lingjie Du, Rui-Rui Du, and Gerard Sullivan

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-01-16

Description: Author(s): Ivan Knez, Charles T. Rettner, See-Hun Yang, Stuart S. P. Parkin, Lingjie Du, Rui-Rui Du, and Gerard Sullivan We observe edge transport in the topologically insulating InAs/GaSb system in the disordered regime. Using asymmetric current paths we show that conduction occurs exclusively along the device edge, exhibiting a large Hall signal at zero magnetic fields, while for symmetric current paths, the conduct... [Phys. Rev. Lett. 112, 026602] Published Wed Jan 15, 2014

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Molecular Quantum Magnetism in LiZn2Mo3O8 (2014)

M. Mourigal, W. T. Fuhrman, J. P. Sheckelton, A. Wartelle, J. A. Rodriguez-Rivera, D. L. Abernathy, T. M. McQueen, and C. L. Broholm

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-01-16

Description: Author(s): M. Mourigal, W. T. Fuhrman, J. P. Sheckelton, A. Wartelle, J. A. Rodriguez-Rivera, D. L. Abernathy, T. M. McQueen, and C. L. Broholm Inelastic neutron scattering at low temperatures T≤30 K from a powder of LiZn2Mo3O8 demonstrates this triangular-lattice antiferromagnet hosts collective magnetic excitations from spin-1/2 Mo3O13 molecules. Apparently gapless (Δ〈0.2 meV) and extending at least up to 2.5 meV, the low-energy magn... [Phys. Rev. Lett. 112, 027202] Published Wed Jan 15, 2014

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Counter-propagating Edge Modes and Topological Phases of a Kicked Quantum Hall System (2014)

Mahmoud Lababidi, Indubala I. Satija, and Erhai Zhao

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-01-16

Description: Author(s): Mahmoud Lababidi, Indubala I. Satija, and Erhai Zhao A periodically driven quantum Hall system in a fixed magnetic field is found to exhibit a series of phases featuring anomalous edge modes with the “wrong” chirality. This leads to pairs of counter-propagating chiral edge modes at each edge, in sharp contrast to stationary quantum Hall systems. We sh... [Phys. Rev. Lett. 112, 026805] Published Wed Jan 15, 2014

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Cubic Mn2Ga Thin Films: Crossing the Spin Gap with Ruthenium (2014)

H. Kurt, K. Rode, P. Stamenov, M. Venkatesan, Y.-C. Lau, E. Fonda, and J. M. D. Coey

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-01-16

Description: Author(s): H. Kurt, K. Rode, P. Stamenov, M. Venkatesan, Y.-C. Lau, E. Fonda, and J. M. D. Coey Cubic Mn2Ga films with the half-Heusler C1b structure are grown on V (001) epitaxial films. The phase is a soft ferrimagnet, with Curie temperature TC = 225 K and magnetization Ms=280 kA m−1, equivalent to 1.65μB per formula. Adding ruthenium leads to an increase of TC up to 550 K in cubic Mn2RuxGa... [Phys. Rev. Lett. 112, 027201] Published Wed Jan 15, 2014

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Nature of Quasielectrons and the Continuum of Neutral Bulk Excitations in Laughlin Quantum Hall Fluids (2014)

Bo Yang and F. D. M. Haldane

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-01-17

Description: Author(s): Bo Yang and F. D. M. Haldane We construct model wave functions for a family of single-quasielectron states supported by the ν=1/3 fractional quantum Hall fluid. The charge e*=e/3 quasielectron state is identified as a composite of a charge-2e* quasiparticle and a −e* quasihole, orbiting around their common center of charge with... [Phys. Rev. Lett. 112, 026804] Published Thu Jan 16, 2014

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Stabilized silicene within bilayer graphene: A proposal based on molecular dynamics and density-functional tight-binding calculations (2014)

G. R. Berdiyorov, M. Neek-Amal, F. M. Peeters, and Adri C. T. van Duin

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-01-23

Description: Author(s): G. R. Berdiyorov, M. Neek-Amal, F. M. Peeters, and Adri C. T. van Duin Freestanding silicene is predicted to display comparable electronic properties as graphene. However, the yet synthesized silicenelike structures have been only realized on different substrates which turned out to exhibit versatile crystallographic structures that are very different from the theoreti... [Phys. Rev. B 89, 024107] Published Wed Jan 22, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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N incorporation and associated localized vibrational modes in GaSb (2014)

J. Buckeridge, D. O. Scanlon, T. D. Veal, M. J. Ashwin, A. Walsh, and C. R. A. Catlow

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-01-23

Description: Author(s): J. Buckeridge, D. O. Scanlon, T. D. Veal, M. J. Ashwin, A. Walsh, and C. R. A. Catlow We present results of electronic structure calculations on the N-related localized vibrational modes in the dilute nitride alloy GaSb1−xNx. By calculating the formation energies of various possible N incorporation modes in the alloy, we determine the most favorable N configurations, and we calculate... [Phys. Rev. B 89, 014107] Published Wed Jan 22, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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A Young-Laplace law for black hole horizons (2014)

José Luis Jaramillo

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2014-01-23

Description: Author(s): José Luis Jaramillo Black hole horizon sections, modeled as marginally outer trapped surfaces (MOTS), possess a notion of stability admitting a spectral characterization. Specifically, the “principal eigenvalue” λo of the MOTS-stability operator (an elliptic operator on horizon sections) must be nonnegative. We discuss... [Phys. Rev. D 89, 021502] Published Wed Jan 22, 2014

Keywords: General relativity, gravitation

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Electronic ISSN: 1089-4918

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Backreaction of a massless minimally coupled scalar field from inflationary quantum fluctuations (2014)

D. Glavan, T. Prokopec, and V. Prymidis

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2014-01-23

Description: Author(s): D. Glavan, T. Prokopec, and V. Prymidis In this paper we study a massless, minimally coupled scalar field in a Friedmann-Lemaître-Robertson-Walker space-time with periods of different constant deceleration parameter. We assume the Bunch-Davies vacuum during inflation and then use a sudden matching approximation to match it onto a radiatio... [Phys. Rev. D 89, 024024] Published Wed Jan 22, 2014

Keywords: General relativity, gravitation

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Scale Invariance and Universality in a Cold Gas of Indirect Excitons (2014)

S. V. Andreev, A. A. Varlamov, and A. V. Kavokin

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-01-24

Description: Author(s): S. V. Andreev, A. A. Varlamov, and A. V. Kavokin We address, theoretically, the puzzling similarity observed in the thermodynamic behavior of independent clouds of cold dipolar excitons in coupled semiconductor quantum wells. We argue that the condensation of self-trapped exciton gas starts at the same critical temperature in all traps due to the ... [Phys. Rev. Lett. 112, 036401] Published Thu Jan 23, 2014

Keywords: Condensed Matter: Electronic Properties, etc.

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Edge Theories in Projected Entangled Pair State Models (2014)

S. Yang, L. Lehman, D. Poilblanc, K. Van Acoleyen, F. Verstraete, J. I. Cirac, and N. Schuch

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-01-24

Description: Author(s): S. Yang, L. Lehman, D. Poilblanc, K. Van Acoleyen, F. Verstraete, J. I. Cirac, and N. Schuch We analyze the low energy excitations of spin lattice systems in two dimensions at zero temperature within the framework of projected entangled pair state models. Perturbations in the bulk give rise to physical excitations located at the edge. We identify the corresponding degrees of freedom, give a... [Phys. Rev. Lett. 112, 036402] Published Thu Jan 23, 2014

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Selective Equal-Spin Andreev Reflections Induced by Majorana Fermions (2014)

James J. He, T. K. Ng, Patrick A. Lee, and K. T. Law

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-01-24

Description: Author(s): James J. He, T. K. Ng, Patrick A. Lee, and K. T. Law In this work, we find that Majorana fermions induce selective equal spin Andreev reflections (SESARs), in which incoming electrons with certain spin polarization in the lead are reflected as counterpropagating holes with the same spin. The spin polarization direction of the electrons of this Andreev... [Phys. Rev. Lett. 112, 037001] Published Thu Jan 23, 2014

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Predicting self-diffusion in metal oxides from first principles: The case of oxygen in tetragonal ZrO2 (2014)

Mostafa Youssef and Bilge Yildiz

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-01-17

Description: Author(s): Mostafa Youssef and Bilge Yildiz Theoretical prediction of self-diffusion in a metal oxide in a wide range of thermodynamic conditions has been a long-standing challenge. Here, we establish that combining the formation free energies and migration barriers of all charged oxygen defects as calculated by density functional theory, wit... [Phys. Rev. B 89, 024105] Published Thu Jan 16, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Dislocation networks in 4He crystals (2014)

A. D. Fefferman, F. Souris, A. Haziot, J. R. Beamish, and S. Balibar

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-01-17

Description: Author(s): A. D. Fefferman, F. Souris, A. Haziot, J. R. Beamish, and S. Balibar The mechanical behavior of crystals is dominated by dislocation networks, their structure, and their interactions with impurities or thermal phonons. However, in classical crystals, networks are usually random with impurities often forming nonequilibrium clusters when their motion freezes at low tem... [Phys. Rev. B 89, 014105] Published Thu Jan 16, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Local structure in perovskite (Ba,Sr)TiO3: Reverse Monte Carlo refinements from multiple measurement techniques (2014)

Igor Levin, Victor Krayzman, and Joseph C. Woicik

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-01-18

Description: Author(s): Igor Levin, Victor Krayzman, and Joseph C. Woicik Local and average structures of ceramic Ba1−xSrxTiO3 solid solutions have been reconciled using Reverse Monte Carlo (RMC) refinements of atomic positions that employ simultaneous fitting of neutron total scattering data, x-ray absorption fine structure, and patterns of diffuse scattering in electron... [Phys. Rev. B 89, 024106] Published Fri Jan 17, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Ab initio study of the effects of interfacial structure on the ferroelectric, magnetic, and magnetoelectric coupling properties of Fe/BaTiO3 multiferroic tunnel junctions (2014)

Binglun Yin and Shaoxing Qu

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-01-22

Description: Author(s): Binglun Yin and Shaoxing Qu Multiferroic tunnel junctions (MFTJs) are usually composed of two ferromagnetic electrodes and an ultrathin layer of ferroelectric barrier, with many physical properties sensitive to the interfacial details. In Fe/BaTiO3 heterostructures, two types of interfacial atomic configurations were observed ... [Phys. Rev. B 89, 014106] Published Tue Jan 21, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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High-order expansions of the Detweiler-Whiting singular field in Kerr spacetime (2014)

Anna Heffernan, Adrian Ottewill, and Barry Wardell

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2014-01-23

Description: Author(s): Anna Heffernan, Adrian Ottewill, and Barry Wardell In a previous paper, we computed expressions for the Detweiler-Whiting singular field of point scalar, electromagnetic and gravitational charges following a geodesic of the Schwarzschild spacetime. We now extend this to the case of equatorial orbits in Kerr spacetime, using coordinate and covariant ... [Phys. Rev. D 89, 024030] Published Wed Jan 22, 2014

Keywords: General relativity, gravitation

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Insulating State and Giant Nonlocal Response in an InAs/GaSb Quantum Well in the Quantum Hall Regime (2014)

Fabrizio Nichele, Atindra Nath Pal, Patrick Pietsch, Thomas Ihn, Klaus Ensslin, Christophe Charpentier, and Werner Wegscheider

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-01-23

Description: Author(s): Fabrizio Nichele, Atindra Nath Pal, Patrick Pietsch, Thomas Ihn, Klaus Ensslin, Christophe Charpentier, and Werner Wegscheider We present transport measurements performed in InAs/GaSb double quantum wells. At the electron-hole crossover tuned by a gate voltage, a strong increase in the longitudinal resistivity is observed with increasing perpendicular magnetic field. Concomitantly with a local resistance exceeding the resis... [Phys. Rev. Lett. 112, 036802] Published Wed Jan 22, 2014

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Screening Charged Impurities and Lifting the Orbital Degeneracy in Graphene by Populating Landau Levels (2014)

Adina Luican-Mayer, Maxim Kharitonov, Guohong Li, Chih-Pin Lu, Ivan Skachko, Alem-Mar B. Gonçalves, K. Watanabe, T. Taniguchi, and Eva Y. Andrei

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-01-24

Description: Author(s): Adina Luican-Mayer, Maxim Kharitonov, Guohong Li, Chih-Pin Lu, Ivan Skachko, Alem-Mar B. Gonçalves, K. Watanabe, T. Taniguchi, and Eva Y. Andrei We report the observation of an isolated charged impurity in graphene and present direct evidence of the close connection between the screening properties of a 2D electron system and the influence of the impurity on its electronic environment. Using scanning tunneling microscopy and Landau level spe... [Phys. Rev. Lett. 112, 036804] Published Thu Jan 23, 2014

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Topologically Protected Magnetic Helix for All-Spin-Based Applications (2014)

E. Y. Vedmedenko and D. Altwein

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-01-11

Description: Author(s): E. Y. Vedmedenko and D. Altwein The recent years have witnessed an emergence of the field of all-spin-based devices without any flow of charge. An ultimate goal of this scientific direction is the realization of the full spectrum of spin-based networks as in modern electronics. The concept of energy-storing elements, indispensable... [Phys. Rev. Lett. 112, 017206] Published Fri Jan 10, 2014

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Quantum Hall Criticality and Localization in Graphene with Short-Range Impurities at the Dirac Point (2014)

S. Gattenlöhner, W.-R. Hannes, P. M. Ostrovsky, I. V. Gornyi, A. D. Mirlin, and M. Titov

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-01-15

Description: Author(s): S. Gattenlöhner, W.-R. Hannes, P. M. Ostrovsky, I. V. Gornyi, A. D. Mirlin, and M. Titov We explore the longitudinal conductivity of graphene at the Dirac point in a strong magnetic field with two types of short-range scatterers: adatoms that mix the valleys and “scalar” impurities that do not mix them. A scattering theory for the Dirac equation is employed to express the conductance of... [Phys. Rev. Lett. 112, 026802] Published Tue Jan 14, 2014

Keywords: Condensed Matter: Electronic Properties, etc.

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Stochastic Current-Induced Magnetization Switching in a Single Semiconducting Ferromagnetic Layer (2014)

J. Gorchon, J. Curiale, A. Lemaître, N. Moisan, M. Cubukcu, G. Malinowski, C. Ulysse, G. Faini, H. J. von Bardeleben, and V. Jeudy

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-01-15

Description: Author(s): J. Gorchon, J. Curiale, A. Lemaître, N. Moisan, M. Cubukcu, G. Malinowski, C. Ulysse, G. Faini, H. J. von Bardeleben, and V. Jeudy We show experimental evidence of magnetization switching in a single (Ga,Mn)(As,P) semiconducting ferromagnetic layer, attributed to a strong reduction of the magnetization and the anisotropy due to current injection. The nucleation of magnetization reversal is found to occur even in the absence of ... [Phys. Rev. Lett. 112, 026601] Published Tue Jan 14, 2014

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Ab initio phase stability at high temperatures and pressures in the V-Cr system (2014)

A. Landa, P. Söderlind, and L. H. Yang

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-01-14

Description: Author(s): A. Landa, P. Söderlind, and L. H. Yang The phase stability of vanadium metal and vanadium-chromium alloys at high temperatures and pressures is explored by means of first-principles electronic-structure calculations. Utilizing the self-consistent ab initio lattice dynamics approach in conjunction with density-functional theory, we show t... [Phys. Rev. B 89, 020101] Published Mon Jan 13, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Combinatorial model for the ferroelectric domain-network formation in hexagonal manganites (2014)

Bruno Mettout, Pierre Tolédano, Martin Lilienblum, and Manfred Fiebig

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-01-14

Description: Author(s): Bruno Mettout, Pierre Tolédano, Martin Lilienblum, and Manfred Fiebig As a result of the high-temperature improper ferroelectric transition occurring in YMnO3 and other hexagonal manganites, a striking domain pattern was observed: an emergence of six domains of alternating polarization from one point in a vortexlike pattern. We derive the formation and distribution of... [Phys. Rev. B 89, 024103] Published Mon Jan 13, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Bulk Dirac Points in Distorted Spinels (2014)

Julia A. Steinberg, Steve M. Young, Saad Zaheer, C. L. Kane, E. J. Mele, and Andrew M. Rappe

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-01-23

Description: Author(s): Julia A. Steinberg, Steve M. Young, Saad Zaheer, C. L. Kane, E. J. Mele, and Andrew M. Rappe We report on a Dirac-like Fermi surface in three-dimensional bulk materials in a distorted spinel structure on the basis of density functional theory as well as tight-binding theory. The four examples we provide in this Letter are BiZnSiO4, BiCaSiO4, BiAlInO4, and BiMgSiO4. A necessary characteristi... [Phys. Rev. Lett. 112, 036403] Published Wed Jan 22, 2014

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Influence of Coulomb Interaction of Tunable Shapes on the Collective Transport of Ultradilute Two-Dimensional Holes (2014)

Jian Huang, L. N. Pfeiffer, and K. W. West

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-01-23

Description: Author(s): Jian Huang, L. N. Pfeiffer, and K. W. West In high quality updoped GaAs field-effect transistors, the two-dimensional charge carrier concentrations can be tuned to very low values similar to the density of electrons on helium surfaces. An important interaction effect, screening of the Coulomb interaction by the gate, rises as a result of the... [Phys. Rev. Lett. 112, 036803] Published Wed Jan 22, 2014

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Magnetic Biasing of a Ferroelectric Hysteresis Loop in a Multiferroic Orthoferrite (2014)

Y. Tokunaga, Y. Taguchi, T. Arima, and Y. Tokura

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-01-24

Description: Author(s): Y. Tokunaga, Y. Taguchi, T. Arima, and Y. Tokura In a multiferroic orthoferrite Dy0.7Tb0.3FeO3, which shows electric-field-(E-)driven magnetization (M) reversal due to a tight clamping between polarization (P) and M, a gigantic effect of magnetic-field (H) biasing on P-E hysteresis loops is observed in the case of rapid E sweeping. The magnitude o... [Phys. Rev. Lett. 112, 037203] Published Thu Jan 23, 2014

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Full Counting Statistics of Andreev Tunneling (2014)

Ville F. Maisi, Dania Kambly, Christian Flindt, and Jukka P. Pekola

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-01-24

Description: Author(s): Ville F. Maisi, Dania Kambly, Christian Flindt, and Jukka P. Pekola We employ a single-charge counting technique to measure the full counting statistics of Andreev events in which Cooper pairs are either produced from electrons that are reflected as holes at a superconductor–normal-metal interface or annihilated in the reverse process. The full counting statistics c... [Phys. Rev. Lett. 112, 036801] Published Thu Jan 23, 2014

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Reentrant Surface Anisotropy in the Antiferromagnetic/Ferromagnetic Bilayer Mn/Co/Cu(001) (2014)

M. Caminale, R. Moroni, P. Torelli, W. C. Lin, M. Canepa, L. Mattera, and F. Bisio

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-01-24

Description: Author(s): M. Caminale, R. Moroni, P. Torelli, W. C. Lin, M. Canepa, L. Mattera, and F. Bisio We investigated the magnetic anisotropy energy of monatomic surface-step atoms in antiferromagnetic/ferromagnetic (AF/FM) epitaxial Mn/Co bilayers grown on vicinal Cu(001) surfaces. The step-induced anisotropy of the Co/Cu(001) films was quenched upon submonolayer Mn deposition, but a reentrant unia... [Phys. Rev. Lett. 112, 037201] Published Thu Jan 23, 2014

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Non-Landau Damping of Magnetic Excitations in Systems with Localized and Itinerant Electrons (2014)

Andrey V. Chubukov, Joseph J. Betouras, and Dmitry V. Efremov

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-01-24

Description: Author(s): Andrey V. Chubukov, Joseph J. Betouras, and Dmitry V. Efremov We discuss the form of the damping of magnetic excitations in a metal near a ferromagnetic instability. The paramagnon theory predicts that the damping term should have the form γ(q,Ω)∝Ω/Γ(q), with Γ(q)∝q (the Landau damping). However, the experiments on uranium metallic compounds UGe2 and UCoGe sho... [Phys. Rev. Lett. 112, 037202] Published Thu Jan 23, 2014

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Structural, elastic, and thermal properties of cementite (Fe3C) calculated using a modified embedded atom method (2014)

Laalitha S. I. Liyanage, Seong-Gon Kim, Jeff Houze, Sungho Kim, Mark A. Tschopp, M. I. Baskes, and M. F. Horstemeyer

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-03-11

Description: Author(s): Laalitha S. I. Liyanage, Seong-Gon Kim, Jeff Houze, Sungho Kim, Mark A. Tschopp, M. I. Baskes, and M. F. Horstemeyer Structural, elastic, and thermal properties of cementite (Fe3C) were studied using a modified embedded atom method (MEAM) potential for iron-carbon (Fe-C) alloys. Previously developed Fe and C single-element potentials were used to develop a Fe-C alloy MEAM potential, using a statistics-based optimi... [Phys. Rev. B 89, 094102] Published Mon Mar 10, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Ab initio (2014)

Pietro Silvi, Tommaso Calarco, Giovanna Morigi, and Simone Montangero

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-03-11

Description: Author(s): Pietro Silvi, Tommaso Calarco, Giovanna Morigi, and Simone Montangero Ions of the same charge inside confining potentials can form crystalline structures which can be controlled by means of the ion density and of the external trap parameters. In particular, a linear chain of trapped ions exhibits a transition to a zigzag equilibrium configuration, which is controlled ... [Phys. Rev. B 89, 094103] Published Mon Mar 10, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Non-180° polarization rotation of ferroelectric (Bi0.5Na0.5)TiO3 single crystals under electric field (2014)

Yuuki Kitanaka, Ken Yanai, Yuji Noguchi, Masaru Miyayama, Yutaka Kagawa, Chikako Moriyoshi, and Yoshihiro Kuroiwa

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-03-11

Description: Author(s): Yuuki Kitanaka, Ken Yanai, Yuji Noguchi, Masaru Miyayama, Yutaka Kagawa, Chikako Moriyoshi, and Yoshihiro Kuroiwa The behavior of the polarization switching by applying electric fields (E) along the 〈100〉 and 〈111〉 directions has been investigated for the single crystals of ferroelectric (Bi0.5Na0.5)TiO3 (BNT) using high-energy synchrotron radiation x-ray diffraction (SR-XRD) and density functional theory (DFT)... [Phys. Rev. B 89, 104104] Published Mon Mar 10, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Microstructure and magnetic disorder induced by nanoindentation in single-crystalline Fe (2014)

Binjun Wang, Yu Gao, and Herbert M. Urbassek

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-03-11

Description: Author(s): Binjun Wang, Yu Gao, and Herbert M. Urbassek Using molecular dynamics simulation, we study nanoindentation into an Fe (100) surface. We use the so-called magnetic interaction potentials provided by Dudarev and Derlet [J. Phys.: Condens. Matter 17, 7097 (2005)] and Chiesa et al. [J. Phys.: Condens. Matter 23, 206001 (2011)] in three different p... [Phys. Rev. B 89, 104105] Published Mon Mar 10, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Signatures of two-level defects in the temperature-dependent damping of nanomechanical silicon nitride resonators (2014)

Thomas Faust, Johannes Rieger, Maximilian J. Seitner, Jörg P. Kotthaus, and Eva M. Weig

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-03-11

Description: Author(s): Thomas Faust, Johannes Rieger, Maximilian J. Seitner, Jörg P. Kotthaus, and Eva M. Weig The damping rates of high quality factor nanomechanical resonators are well beyond intrinsic limits. Here, we explore the underlying microscopic loss mechanisms by investigating the temperature-dependent damping of the fundamental and third harmonic transverse flexural mode of a doubly clamped silic... [Phys. Rev. B 89, 100102] Published Mon Mar 10, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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New Class of Topological Superconductors Protected by Magnetic Group Symmetries (2014)

Chen Fang, Matthew J. Gilbert, and B. Andrei Bernevig

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-03-11

Description: Author(s): Chen Fang, Matthew J. Gilbert, and B. Andrei Bernevig We study a new type of three-dimensional topological superconductor that exhibits Majorana zero modes (MZM) protected by a magnetic group symmetry, a combined antiunitary symmetry composed of a mirror reflection and time reversal. This new symmetry enhances the noninteracting topological classificat... [Phys. Rev. Lett. 112, 106401] Published Mon Mar 10, 2014

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Spin Transfer of Quantum Information between Majorana Modes and a Resonator (2014)

Alexey A. Kovalev, Amrit De, and Kirill Shtengel

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-03-11

Description: Author(s): Alexey A. Kovalev, Amrit De, and Kirill Shtengel We show that resonant coupling and entanglement between a mechanical resonator and Majorana bound states can be achieved via spin currents in a 1D quantum wire with strong spin-orbit interactions. The bound states induced by vibrating and stationary magnets can hybridize, thus resulting in spin-curr... [Phys. Rev. Lett. 112, 106402] Published Mon Mar 10, 2014

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One-Dimensional Fermions with neither Luttinger-Liquid nor Fermi-Liquid Behavior (2014)

A. V. Rozhkov

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-03-11

Description: Author(s): A. V. Rozhkov It is well known that, generically, one-dimensional interacting fermions cannot be described in terms of a Fermi liquid. Instead, they present a different phenomenology, that of a Tomonaga-Luttinger liquid: the Landau quasiparticles are ill defined, and the fermion occupation number is continuous at... [Phys. Rev. Lett. 112, 106403] Published Mon Mar 10, 2014

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Charge Disproportionation without Charge Transfer in the Rare-Earth-Element Nickelates as a Possible Mechanism for the Metal-Insulator Transition (2014)

Steve Johnston, Anamitra Mukherjee, Ilya Elfimov, Mona Berciu, and George A. Sawatzky

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-03-11

Description: Author(s): Steve Johnston, Anamitra Mukherjee, Ilya Elfimov, Mona Berciu, and George A. Sawatzky We study a model for the metal-insulator (M−I) transition in the rare-earth-element nickelates RNiO3, based upon a negative charge transfer energy and coupling to a rocksaltlike lattice distortion of the NiO6 octahedra. Using exact diagonalization and the Hartree-Fock approximation we demonstrate th... [Phys. Rev. Lett. 112, 106404] Published Mon Mar 10, 2014

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Direct Observation of Magnetic Metastability in Individual Iron Nanoparticles (2014)

Ana Balan, Peter M. Derlet, Arantxa Fraile Rodríguez, Joachim Bansmann, Rocio Yanes, Ulrich Nowak, Armin Kleibert, and Frithjof Nolting

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-03-11

Description: Author(s): Ana Balan, Peter M. Derlet, Arantxa Fraile Rodríguez, Joachim Bansmann, Rocio Yanes, Ulrich Nowak, Armin Kleibert, and Frithjof Nolting X-ray photoemission electron microscopy combined with x-ray magnetic circular dichroism is used to study the magnetic properties of individual iron nanoparticles with sizes ranging from 20 down to 8 nm. While the magnetocrystalline anisotropy of bulk iron suggests superparamagnetic behavior in this ... [Phys. Rev. Lett. 112, 107201] Published Mon Mar 10, 2014

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Universal Entanglement Crossover of Coupled Quantum Wires (2014)

Romain Vasseur, Jesper Lykke Jacobsen, and Hubert Saleur

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-03-11

Description: Author(s): Romain Vasseur, Jesper Lykke Jacobsen, and Hubert Saleur We consider the entanglement between two one-dimensional quantum wires (Luttinger liquids) coupled by tunneling through a quantum impurity. The physics of the system involves a crossover between weak and strong coupling regimes characterized by an energy scale TB, and methods of conformal field theo... [Phys. Rev. Lett. 112, 106601] Published Mon Mar 10, 2014

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Nonfrustrated Interlayer Order and its Relevance to the Bose-Einstein Condensation of Magnons in BaCuSi2O6 (2014)

Vladimir V. Mazurenko, Maria V. Valentyuk, Raivo Stern, and Alexander A. Tsirlin

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-03-11

Description: Author(s): Vladimir V. Mazurenko, Maria V. Valentyuk, Raivo Stern, and Alexander A. Tsirlin Han purple (BaCuSi2O6) is not only an ancient pigment, but also a valuable model material for studying Bose-Einstein condensation of magnons in high magnetic fields. Using precise low-temperature structural data and extensive density-functional calculations, we elucidate magnetic couplings in this c... [Phys. Rev. Lett. 112, 107202] Published Mon Mar 10, 2014

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Atomic structure and microstructures of supertetragonal multiferroic BiFeO3 thin films (2014)

F. Pailloux, M. Couillard, S. Fusil, F. Bruno, W. Saidi, V. Garcia, C. Carrétéro, E. Jacquet, M. Bibes, A. Barthélémy, G. A. Botton, and J. Pacaud

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-03-13

Description: Author(s): F. Pailloux, M. Couillard, S. Fusil, F. Bruno, W. Saidi, V. Garcia, C. Carrétéro, E. Jacquet, M. Bibes, A. Barthélémy, G. A. Botton, and J. Pacaud We revisit the atomic structure and microstructure of the so-called supertetragonal phases of highly strained epitaxial BiFeO3 thin films. Quantitative atomic resolution scanning transmission electron microscopy is used to directly image the atomic positions. A crystallographic phase suggested by el... [Phys. Rev. B 89, 104106] Published Wed Mar 12, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Spin Pumping and Inverse Spin Hall Effect in Platinum: The Essential Role of Spin-Memory Loss at Metallic Interfaces (2014)

J.-C. Rojas-Sánchez, N. Reyren, P. Laczkowski, W. Savero, J.-P. Attané, C. Deranlot, M. Jamet, J.-M. George, L. Vila, and H. Jaffrès

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-03-13

Description: Author(s): J.-C. Rojas-Sánchez, N. Reyren, P. Laczkowski, W. Savero, J.-P. Attané, C. Deranlot, M. Jamet, J.-M. George, L. Vila, and H. Jaffrès Through combined ferromagnetic resonance, spin pumping, and inverse spin Hall effect experiments in Co|Pt bilayers and Co|Cu|Pt trilayers, we demonstrate consistent values of ℓsfPt=3.4±0.4 nm and θSHEPt=0.056±0.010 for the respective spin diffusion length and spin Hall angle for Pt. Our data and mo... [Phys. Rev. Lett. 112, 106602] Published Wed Mar 12, 2014

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Arti Garg, H. R. Krishnamurthy, and Mohit Randeria

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-03-13

Description: Author(s): Arti Garg, H. R. Krishnamurthy, and Mohit Randeria We demonstrate in a simple model the surprising result that turning on an on-site Coulomb interaction U in a doped band insulator leads to the formation of a half-metallic state. In the undoped system, we show that increasing U leads to a first order transition at a finite value UAF between a parama... [Phys. Rev. Lett. 112, 106406] Published Wed Mar 12, 2014

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Valley-Polarized Quantum Anomalous Hall Effect in Silicene (2014)

Hui Pan, Zhenshan Li, Cheng-Cheng Liu, Guobao Zhu, Zhenhua Qiao, and Yugui Yao

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-03-13

Description: Author(s): Hui Pan, Zhenshan Li, Cheng-Cheng Liu, Guobao Zhu, Zhenhua Qiao, and Yugui Yao We find theoretically a new quantum state of matter—the valley-polarized quantum anomalous Hall state in silicene. In the presence of Rashba spin-orbit coupling and an exchange field, silicene hosts a quantum anomalous Hall state with Chern number C=2. We show that through tuning the Rashba spin-orb... [Phys. Rev. Lett. 112, 106802] Published Wed Mar 12, 2014

Keywords: Condensed Matter: Electronic Properties, etc.

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Electronic Excitations of a Magnetic Impurity State in the Diluted Magnetic Semiconductor (Ga,Mn)As (2014)

M. Kobayashi, H. Niwa, Y. Takeda, A. Fujimori, Y. Senba, H. Ohashi, A. Tanaka, S. Ohya, P. N. Hai, M. Tanaka, Y. Harada, and M. Oshima

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-03-13

Description: Author(s): M. Kobayashi, H. Niwa, Y. Takeda, A. Fujimori, Y. Senba, H. Ohashi, A. Tanaka, S. Ohya, P. N. Hai, M. Tanaka, Y. Harada, and M. Oshima The electronic structure of doped Mn in (Ga,Mn)As is studied by resonant inelastic x-ray scattering. From configuration-interaction cluster-model calculations, the line shapes of the Mn L3 resonant inelastic x-ray scattering spectra can be explained by d-d excitations from the Mn ground state domina... [Phys. Rev. Lett. 112, 107203] Published Wed Mar 12, 2014

Keywords: Condensed Matter: Electronic Properties, etc.

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High Resolution Coherent Population Trapping on a Single Hole Spin in a Semiconductor Quantum Dot (2014)

Julien Houel, Jonathan H. Prechtel, Andreas V. Kuhlmann, Daniel Brunner, Christopher E. Kuklewicz, Brian D. Gerardot, Nick G. Stoltz, Pierre M. Petroff, and Richard J. Warburton

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-03-13

Description: Author(s): Julien Houel, Jonathan H. Prechtel, Andreas V. Kuhlmann, Daniel Brunner, Christopher E. Kuklewicz, Brian D. Gerardot, Nick G. Stoltz, Pierre M. Petroff, and Richard J. Warburton We report high resolution coherent population trapping on a single hole spin in a semiconductor quantum dot. The absorption dip signifying the formation of a dark state exhibits an atomic physicslike dip width of just 10 MHz. We observe fluctuations in the absolute frequency of the absorption dip, e... [Phys. Rev. Lett. 112, 107401] Published Wed Mar 12, 2014

Keywords: Condensed Matter: Electronic Properties, etc.

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Ab initio (2014)

S. Mazevet, V. Recoules, J. Bouchet, F. Guyot, M. Harmand, A. Ravasio, and A. Benuzzi-Mounaix

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-03-14

Description: Author(s): S. Mazevet, V. Recoules, J. Bouchet, F. Guyot, M. Harmand, A. Ravasio, and A. Benuzzi-Mounaix Using ab initio simulations within the generalized gradient approximation, we calculate x-ray absorption near edge spectra (XANES) at the iron K edge throughout the high-pressure phase diagram and up to extreme density and temperature conditions that are representative of the Earth's inner core (up ... [Phys. Rev. B 89, 100103] Published Thu Mar 13, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Effective-one-body model for black-hole binaries with generic mass ratios and spins (2014)

Andrea Taracchini, Alessandra Buonanno, Yi Pan, Tanja Hinderer, Michael Boyle, Daniel A. Hemberger, Lawrence E. Kidder, Geoffrey Lovelace, Abdul H. Mroué, Harald P. Pfeiffer, Mark A. Scheel, Béla Szilágyi, Nicholas W. Taylor, and Anil Zenginoglu

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2014-03-14

Description: Author(s): Andrea Taracchini, Alessandra Buonanno, Yi Pan, Tanja Hinderer, Michael Boyle, Daniel A. Hemberger, Lawrence E. Kidder, Geoffrey Lovelace, Abdul H. Mroué, Harald P. Pfeiffer, Mark A. Scheel, Béla Szilágyi, Nicholas W. Taylor, and Anil Zenginoglu Gravitational waves emitted by black-hole binary systems have the highest signal-to-noise ratio in LIGO and Virgo detectors when black-hole spins are aligned with the orbital angular momentum and extremal. For such systems, we extend the effective-one-body inspiral-merger-ringdown waveforms to gener... [Phys. Rev. D 89, 061502] Published Thu Mar 13, 2014

Keywords: General relativity, gravitation

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Detection of Time-Reversal Symmetry Breaking in the Noncentrosymmetric Superconductor Re6Zr Using Muon-Spin Spectroscopy (2014)

R. P. Singh, A. D. Hillier, B. Mazidian, J. Quintanilla, J. F. Annett, D. McK. Paul, G. Balakrishnan, and M. R. Lees

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-03-14

Description: Author(s): R. P. Singh, A. D. Hillier, B. Mazidian, J. Quintanilla, J. F. Annett, D. McK. Paul, G. Balakrishnan, and M. R. Lees We have investigated the superconducting state of the noncentrosymmetric compound Re6Zr using magnetization, heat capacity, and muon-spin relaxation or rotation (μSR) measurements. Re6Zr has a superconducting transition temperature, Tc=6.75±0.05 K. Transverse-field μSR experiments, used to probe th... [Phys. Rev. Lett. 112, 107002] Published Thu Mar 13, 2014

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Theoretical Prediction and Spectroscopic Fingerprints of an Orbital Transition in CeCu2Si2 (2014)

L. V. Pourovskii, P. Hansmann, M. Ferrero, and A. Georges

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-03-14

Description: Author(s): L. V. Pourovskii, P. Hansmann, M. Ferrero, and A. Georges We show that the heavy-fermion compound CeCu2Si2 undergoes a transition between two regimes dominated by different crystal-field states. At low pressure P and low temperature T the Ce 4f electron resides in the atomic crystal-field ground state, while at high P or T, the electron occupancy and spect... [Phys. Rev. Lett. 112, 106407] Published Thu Mar 13, 2014

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Radiative Topological States in Resonant Photonic Crystals (2014)

A. V. Poshakinskiy, A. N. Poddubny, L. Pilozzi, and E. L. Ivchenko

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-03-14

Description: Author(s): A. V. Poshakinskiy, A. N. Poddubny, L. Pilozzi, and E. L. Ivchenko We present a theory of topological edge states in one-dimensional resonant photonic crystals with a compound unit cell. Contrary to the conventional electronic topological states, the modes under consideration are radiative; i.e., they decay in time due to the light escape through the structure boun... [Phys. Rev. Lett. 112, 107403] Published Thu Mar 13, 2014

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Strain-Induced Gap Modification in Black Phosphorus (2014)

A. S. Rodin, A. Carvalho, and A. H. Castro Neto

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2014-05-02

Description: Author(s): A. S. Rodin, A. Carvalho, and A. H. Castro Neto The band structure of single-layer black phosphorus and the effect of strain are predicted using density functional theory and tight-binding models. Having determined the localized orbital composition of the individual bands from first principles, we use the system symmetry to write down the effecti... [Phys. Rev. Lett. 112, 176801] Published Thu May 01, 2014

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Ab initio (2014)

A. van de Walle, Q. Hong, L. Miljacic, C. Balaji Gopal, S. Demers, G. Pomrehn, A. Kowalski, and P. Tiwary

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-05-03

Description: Author(s): A. van de Walle, Q. Hong, L. Miljacic, C. Balaji Gopal, S. Demers, G. Pomrehn, A. Kowalski, and P. Tiwary We describe a simple method to determine, from ab initio calculations, the complete orientation dependence of interfacial free energies in solid-state crystalline systems. We illustrate the method with an application to precipitates in the Al-Ti alloy system. The method combines the cluster expansio... [Phys. Rev. B 89, 184101] Published Fri May 02, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Black hole superradiance in dynamical spacetime (2014)

William E. East, Fethi M. Ramazanoğlu, and Frans Pretorius

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2014-03-21

Description: Author(s): William E. East, Fethi M. Ramazanoğlu, and Frans Pretorius We study the superradiant scattering of gravitational waves by a nearly extremal black hole (dimensionless spin a=0.99) by numerically solving the full Einstein field equations, thus including backreaction effects. This allows us to study the dynamics of the black hole as it loses energy and angular... [Phys. Rev. D 89, 061503] Published Thu Mar 20, 2014

Keywords: General relativity, gravitation

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