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Ultrafast high-fidelity initialization of a quantum-dot spin qubit without magnetic fields (2014)

Jonathan D. Mar, Jeremy J. Baumberg, Xiulai Xu, Andrew C. Irvine, and David A. Williams

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-16

Beschreibung: Author(s): Jonathan D. Mar, Jeremy J. Baumberg, Xiulai Xu, Andrew C. Irvine, and David A. Williams We demonstrate the initialization of a single quantum-dot hole spin with high fidelity (lower bound 〉97%), on picosecond time scales, and without the need for magnetic fields. Using the initialization scheme based on rapid electric-field ionization of a resonantly excited exciton, this is achieve... [Phys. Rev. B 90, 241303] Published Mon Dec 15, 2014

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Print ISSN: 1098-0121

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Thema: Physik

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Many-body effects in a quasi-one-dimensional electron gas (2014)

Sanjeev Kumar, Kalarikad J. Thomas, Luke W. Smith, Michael Pepper, Graham L. Creeth, Ian Farrer, David Ritchie, Geraint Jones, and Jonathan Griffiths

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-07

Beschreibung: Author(s): Sanjeev Kumar, Kalarikad J. Thomas, Luke W. Smith, Michael Pepper, Graham L. Creeth, Ian Farrer, David Ritchie, Geraint Jones, and Jonathan Griffiths We have investigated electron transport in a quasi-one dimensional (quasi-1D) electron gas as a function of the confinement potential. At a particular potential configuration, and electron concentration, the ground state of a 1D quantum wire splits into two rows to form an incipient Wigner lattice. ... [Phys. Rev. B 90, 201304] Published Thu Nov 06, 2014

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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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Publikationsdatum: 2014-11-07

Beschreibung: 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

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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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Publikationsdatum: 2014-11-07

Beschreibung: 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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Publikationsdatum: 2014-11-07

Beschreibung: 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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Publikationsdatum: 2014-11-07

Beschreibung: 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

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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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Publikationsdatum: 2014-11-08

Beschreibung: 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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Publikationsdatum: 2014-11-08

Beschreibung: 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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Publikationsdatum: 2014-11-08

Beschreibung: 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

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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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Publikationsdatum: 2014-11-08

Beschreibung: 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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Publikationsdatum: 2014-11-08

Beschreibung: 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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Publikationsdatum: 2014-11-04

Beschreibung: 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

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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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Publikationsdatum: 2014-11-04

Beschreibung: 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

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Tuning the electrically evaluated electron Landé g factor in GaAs quantum dots and quantum wells of different well widths (2014)

G. Allison, T. Fujita, K. Morimoto, S. Teraoka, M. Larsson, H. Kiyama, A. Oiwa, S. Haffouz, D. G. Austing, A. Ludwig, A. D. Wieck, and S. Tarucha

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-12

Beschreibung: Author(s): G. Allison, T. Fujita, K. Morimoto, S. Teraoka, M. Larsson, H. Kiyama, A. Oiwa, S. Haffouz, D. G. Austing, A. Ludwig, A. D. Wieck, and S. Tarucha We evaluate the Landé g factor of electrons in quantum dots (QDs) fabricated from GaAs quantum well (QW) structures of different well width. We first determine the Landé electron g factor of the QWs through resistive detection of electron spin resonance and compare it to the enhanced electron g fact... [Phys. Rev. B 90, 235310] Published Thu Dec 11, 2014

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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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Publikationsdatum: 2014-12-12

Beschreibung: 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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Publikationsdatum: 2014-12-16

Beschreibung: 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

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Depth dependence of the ionization energy of shallow hydrogen states in ZnO and CdS (2014)

T. Prokscha, H. Luetkens, E. Morenzoni, G. J. Nieuwenhuys, A. Suter, M. Döbeli, M. Horisberger, and E. Pomjakushina

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-02

Beschreibung: Author(s): T. Prokscha, H. Luetkens, E. Morenzoni, G. J. Nieuwenhuys, A. Suter, M. Döbeli, M. Horisberger, and E. Pomjakushina The characteristics of shallow hydrogenlike muonium (Mu) states in nominally undoped ZnO and CdS (0001) crystals have been studied close to the surface at depths in the range of 10–180 nm by using low-energy muons and in the bulk using conventional μSR. The muon implantation depths are adjusted by t... [Phys. Rev. B 90, 235303] Published Mon Dec 01, 2014

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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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Publikationsdatum: 2014-12-03

Beschreibung: 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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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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Publikationsdatum: 2014-12-04

Beschreibung: 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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Publikationsdatum: 2014-12-04

Beschreibung: 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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Publikationsdatum: 2014-12-04

Beschreibung: 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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Publikationsdatum: 2014-12-04

Beschreibung: 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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Publikationsdatum: 2014-12-04

Beschreibung: 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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Publikationsdatum: 2014-12-04

Beschreibung: 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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Publikationsdatum: 2014-12-04

Beschreibung: 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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Publikationsdatum: 2014-12-04

Beschreibung: 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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Publikationsdatum: 2014-12-04

Beschreibung: 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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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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Publikationsdatum: 2014-12-05

Beschreibung: 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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Publikationsdatum: 2014-12-05

Beschreibung: 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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Intersurface interaction via phonons in a three-dimensional topological insulator (2014)

Tetsuro Habe

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-11

Beschreibung: Author(s): Tetsuro Habe We theoretically study the phonon-mediated intersurface electron-electron interactions on the pseudo-two-dimensional metallic states at the two surfaces of a three-dimensional topological insulator. From a model of a three-dimensional topological insulator including the phonon excitation in it, we d... [Phys. Rev. B 89, 035305] Published Fri Jan 10, 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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Publikationsdatum: 2014-01-11

Beschreibung: 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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Publikationsdatum: 2014-01-11

Beschreibung: 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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Publikationsdatum: 2014-01-11

Beschreibung: 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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Publikationsdatum: 2014-01-11

Beschreibung: 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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Publikationsdatum: 2014-01-15

Beschreibung: 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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Publikationsdatum: 2014-01-15

Beschreibung: 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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Publikationsdatum: 2014-01-15

Beschreibung: 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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Dynamics of a localized spin excitation close to the spin-helix regime (2014)

G. Salis, M. P. Walser, P. Altmann, C. Reichl, and W. Wegscheider

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-14

Beschreibung: Author(s): G. Salis, M. P. Walser, P. Altmann, C. Reichl, and W. Wegscheider The time evolution of a local spin excitation in a (001)-confined two-dimensional electron gas subjected to Rashba and Dresselhaus spin-orbit interactions of similar strength is investigated theoretically and compared with experimental data. Specifically, the consequences of the finite spatial exten... [Phys. Rev. B 89, 045304] Published Mon Jan 13, 2014

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Tight-binding calculations of image-charge effects in colloidal nanoscale platelets of CdSe (2014)

R. Benchamekh, N. A. Gippius, J. Even, M. O. Nestoklon, J.-M. Jancu, S. Ithurria, B. Dubertret, Al. L. Efros, and P. Voisin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-14

Beschreibung: Author(s): R. Benchamekh, N. A. Gippius, J. Even, M. O. Nestoklon, J.-M. Jancu, S. Ithurria, B. Dubertret, Al. L. Efros, and P. Voisin CdSe nanoplatelets show perfectly quantized thicknesses of a few monolayers. They present a situation of extreme, yet well defined quantum confinement. Due to a large dielectric contrast between the semiconductor and its ligand environment, interaction between carriers and their dielectric images st... [Phys. Rev. B 89, 035307] Published Mon Jan 13, 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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Publikationsdatum: 2014-01-14

Beschreibung: 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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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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Publikationsdatum: 2014-01-16

Beschreibung: 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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Publikationsdatum: 2014-01-16

Beschreibung: 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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Beschreibung: 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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Beschreibung: 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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Publikationsdatum: 2014-01-16

Beschreibung: 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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Publikationsdatum: 2014-01-16

Beschreibung: 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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Publikationsdatum: 2014-01-17

Beschreibung: 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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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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Publikationsdatum: 2014-01-24

Beschreibung: 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

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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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Publikationsdatum: 2014-01-24

Beschreibung: 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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Publikationsdatum: 2014-01-24

Beschreibung: 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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Anomalous crossed Andreev reflection in a mesoscopic superconducting ring hosting Majorana fermions (2014)

Minchul Lee, Heunghwan Khim, and Mahn-Soo Choi

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-18

Beschreibung: Author(s): Minchul Lee, Heunghwan Khim, and Mahn-Soo Choi We investigate the Majorana physics and its effect on the electron transport in the nontopological superconductor (NS)–topological superconductor (TS) double junctions of a loop geometry. We find that, depending on the ratio between the lengths of two topologically different regions and the localiza... [Phys. Rev. B 89, 035309] Published Fri Jan 17, 2014

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Local band bending and grain-to-grain interaction induced strain nonuniformity in polycrystalline CdTe films (2014)

V. Consonni, N. Baier, O. Robach, C. Cayron, F. Donatini, and G. Feuillet

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-22

Beschreibung: Author(s): V. Consonni, N. Baier, O. Robach, C. Cayron, F. Donatini, and G. Feuillet The local physical properties of polycrystalline semiconducting films drive their performances in a wide variety of optoelectronic devices but are still not completely elucidated. These properties are investigated and correlated on the same region of polycrystalline CdTe films by combining electron ... [Phys. Rev. B 89, 035310] Published Tue Jan 21, 2014

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Electron affinities and ionization energies of Cu and Ag delafossite compounds: A hybrid functional study (2014)

Mao-Sheng Miao, Sam Yarbro, Phillip T. Barton, and Ram Seshadri

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-22

Beschreibung: Author(s): Mao-Sheng Miao, Sam Yarbro, Phillip T. Barton, and Ram Seshadri Using density functional theory with a hybrid functional, we calculate the ionization energies and electron affinities of a series of delafossite compounds (AMO2: A=Cu, Ag; M=B, Al, Ga, In, Sc). The alignments of the valence band maximum and the conduction band minimum, which directly relate to the ... [Phys. Rev. B 89, 045306] Published Tue Jan 21, 2014

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Frequency cavity pulling induced by a single semiconductor quantum dot (2014)

Daniel Valente, Jan Suffczyński, Tomasz Jakubczyk, Adrien Dousse, Aristide Lemaître, Isabelle Sagnes, Loïc Lanco, Paul Voisin, Alexia Auffèves, and Pascale Senellart

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-22

Beschreibung: Author(s): Daniel Valente, Jan Suffczyński, Tomasz Jakubczyk, Adrien Dousse, Aristide Lemaître, Isabelle Sagnes, Loïc Lanco, Paul Voisin, Alexia Auffèves, and Pascale Senellart We investigate the emission properties of a single semiconductor quantum dot deterministically coupled to a confined optical mode in the weak-coupling regime. A strong spectral pulling, broadening, and narrowing of the cavity mode emission is evidenced when changing the spectral detuning between the... [Phys. Rev. B 89, 041302] Published Tue Jan 21, 2014

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Tunneling current through fractional quantum Hall interferometers (2014)

O. Smits, J. K. Slingerland, and S. H. Simon

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-22

Beschreibung: Author(s): O. Smits, J. K. Slingerland, and S. H. Simon We calculate the tunneling current through a Fabry-Pérot interferometer in the fractional quantum Hall regime. Within linear response theory (weak tunneling but arbitrary source-drain voltage), we find a general expression for the current due to tunneling of quasiparticles in terms of Carlson's R fu... [Phys. Rev. B 89, 045308] Published Tue Jan 21, 2014

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Dipole-induced high-order sideband comb employing a quantum dot strongly coupled to a photonic crystal cavity via a waveguide (2014)

Jiahua Li, Rong Yu, and Ying Wu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-23

Beschreibung: Author(s): Jiahua Li, Rong Yu, and Ying Wu We propose a scheme for high-order sideband generation (HSG) by utilizing strong coupling between a single quantum dot (QD) and a photonic crystal cavity beyond the weak-excitation approximation. Here the hybrid system is coherently driven by an external bichromatic field consisting of a continuous-... [Phys. Rev. B 89, 035311] Published Wed Jan 22, 2014

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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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Publikationsdatum: 2014-01-23

Beschreibung: 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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Publikationsdatum: 2014-01-24

Beschreibung: 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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Experimental investigation of the optical spin-selection rules in bulk Si and Ge/Si quantum dots (2014)

N. Sircar and D. Bougeard

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-11

Beschreibung: Author(s): N. Sircar and D. Bougeard We study the relationship between the circular polarization of photoluminescence and the magnetic-field-induced spin polarization of the recombining charge carriers in bulk Si and Ge/Si quantum dots. First, we quantitatively compare experimental results on the degree of circular polarization of phot... [Phys. Rev. B 89, 041301] Published Fri Jan 10, 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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Publikationsdatum: 2014-01-11

Beschreibung: 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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Publikationsdatum: 2014-01-15

Beschreibung: 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

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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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Publikationsdatum: 2014-01-15

Beschreibung: 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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Spin relaxation in inhomogeneous quantum dot arrays studied by electron spin resonance (2014)

A. F. Zinovieva, N. P. Stepina, A. I. Nikiforov, A. V. Nenashev, A. V. Dvurechenskii, L. V. Kulik, M. C. Carmo, and N. A. Sobolev

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-17

Beschreibung: Author(s): A. F. Zinovieva, N. P. Stepina, A. I. Nikiforov, A. V. Nenashev, A. V. Dvurechenskii, L. V. Kulik, M. C. Carmo, and N. A. Sobolev Electron states in an inhomogeneous Ge/Si quantum dot array with groups of closely spaced quantum dots were studied by the conventional continuous-wave electron spin resonance and spin-echo techniques. We have found that the existence of quantum dot groups allows increasing the spin relaxation time ... [Phys. Rev. B 89, 045305] Published Thu Jan 16, 2014

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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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Publikationsdatum: 2014-01-23

Beschreibung: 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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Publikationsdatum: 2014-01-23

Beschreibung: 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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Publikationsdatum: 2014-01-24

Beschreibung: 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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Publikationsdatum: 2014-01-24

Beschreibung: 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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Publikationsdatum: 2014-01-24

Beschreibung: 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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Publikationsdatum: 2014-01-24

Beschreibung: 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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Exciton spin dynamics of colloidal CdTe nanocrystals in magnetic fields (2014)

Feng Liu, A. V. Rodina, D. R. Yakovlev, A. Greilich, A. A. Golovatenko, A. S. Susha, A. L. Rogach, Yu. G. Kusrayev, and M. Bayer

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-11

Beschreibung: Author(s): Feng Liu, A. V. Rodina, D. R. Yakovlev, A. Greilich, A. A. Golovatenko, A. S. Susha, A. L. Rogach, Yu. G. Kusrayev, and M. Bayer The recombination and spin dynamics of excitons in colloidal CdTe nanocrystals (NCs) are studied by time-resolved photoluminescence in high magnetic fields up to 15 T and at cryogenic temperatures. The recombination decay shows a nonexponential temporal behavior, with the longest component correspon... [Phys. Rev. B 89, 115306] Published Mon Mar 10, 2014

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Superconducting proximity effect and zero-bias anomaly in transport through quantum dots weakly attached to ferromagnetic leads (2014)

Ireneusz Weymann and Piotr Trocha

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-11

Beschreibung: Author(s): Ireneusz Weymann and Piotr Trocha The Andreev transport through a quantum dot coupled to two external ferromagnetic leads and one superconducting lead is studied theoretically by means of the real-time diagrammatic technique in sequential and cotunneling regimes. We show that the tunnel magnetoresistance (TMR) of the Andreev current... [Phys. Rev. B 89, 115305] Published Mon Mar 10, 2014

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Ultranarrow ionization resonances in a quantum dot under broadband excitation (2014)

S. Gustavsson, M. S. Rudner, L. S. Levitov, R. Leturcq, M. Studer, T. Ihn, and K. Ensslin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-11

Beschreibung: Author(s): S. Gustavsson, M. S. Rudner, L. S. Levitov, R. Leturcq, M. Studer, T. Ihn, and K. Ensslin Semiconductor quantum dots driven by the broadband radiation fields of nearby quantum point contacts provide an interesting setting for probing dynamics in driven quantum systems at the nanoscale. We report on real-time charge-sensing measurements of the dot occupation, which reveal sharp resonances... [Phys. Rev. B 89, 115304] Published Mon Mar 10, 2014

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Fermi-level stabilization in the topological insulators Bi2Se3 and Bi2Te3: Origin of the surface electron gas (2014)

Joonki Suh, Deyi Fu, Xinyu Liu, Jacek K. Furdyna, Kin Man Yu, Wladyslaw Walukiewicz, and Junqiao Wu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-11

Beschreibung: Author(s): Joonki Suh, Deyi Fu, Xinyu Liu, Jacek K. Furdyna, Kin Man Yu, Wladyslaw Walukiewicz, and Junqiao Wu Two-dimensional electron gas (2DEG) coexists with topological states on the surface of topological insulators (TIs), while the origin of the 2DEG remains elusive. In this work, electron density in TI thin films (Bi2Se3, Bi2Te3, and their alloys) were manipulated by controlling the density of electro... [Phys. Rev. B 89, 115307] Published Mon Mar 10, 2014

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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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Publikationsdatum: 2014-03-11

Beschreibung: 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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Publikationsdatum: 2014-03-11

Beschreibung: 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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Publikationsdatum: 2014-03-11

Beschreibung: 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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Publikationsdatum: 2014-03-11

Beschreibung: 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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Beschreibung: 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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Publikationsdatum: 2014-03-11

Beschreibung: 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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Publikationsdatum: 2014-03-11

Beschreibung: 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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Anomalous anticrossing of neutral exciton states in GaAs/AlGaAs quantum dots (2014)

S. Kumar, E. Zallo, Y. H. Liao, P. Y. Lin, R. Trotta, P. Atkinson, J. D. Plumhof, F. Ding, B. D. Gerardot, S. J. Cheng, A. Rastelli, and O. G. Schmidt

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-13

Beschreibung: Author(s): S. Kumar, E. Zallo, Y. H. Liao, P. Y. Lin, R. Trotta, P. Atkinson, J. D. Plumhof, F. Ding, B. D. Gerardot, S. J. Cheng, A. Rastelli, and O. G. Schmidt We study the effects of heavy hole–light hole (HH-LH) mixing on fine-structure and polarization properties of neutral excitons (X0) confined in single GaAs/AlGaAs quantum dots (QDs) under the application of anisotropic biaxial stress. In the large HH-LH mixing regime, these properties are substantia... [Phys. Rev. B 89, 115309] Published Wed Mar 12, 2014

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Optical second-harmonic generation induced by electric current in graphene on Si and SiC substrates (2014)

Yong Q. An, J. E. Rowe, Daniel B. Dougherty, Ji Ung Lee, and Alain C. Diebold

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-13

Beschreibung: Author(s): Yong Q. An, J. E. Rowe, Daniel B. Dougherty, Ji Ung Lee, and Alain C. Diebold We find that the flow of direct electric current (dc) through graphene on substrate enhances surface optical second-harmonic generation (SHG) from the graphene/substrate system. The current can enhance surface SHG by about 300% for a chemical-vapor-deposition (CVD) graphene monolayer on a SiO2/Si(00... [Phys. Rev. B 89, 115310] Published Wed Mar 12, 2014

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Investigation of electron transmission through Co/C/Co magnetic tunnel junctions (2014)

Felix Huerkamp, Peter Krüger, and Johannes Pollmann

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-13

Beschreibung: Author(s): Felix Huerkamp, Peter Krüger, and Johannes Pollmann We investigate transmission properties of electrons at the interfaces of cobalt-diamond hybrid systems. To this end, we employ a Green's function method based on spin-polarized density-functional theory calculations using a Gaussian orbital representation of the wave functions. The considered open s... [Phys. Rev. B 89, 125302] Published Wed Mar 12, 2014

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Hall viscosity of hierarchical quantum Hall states (2014)

M. Fremling, T. H. Hansson, and J. Suorsa

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-13

Beschreibung: Author(s): M. Fremling, T. H. Hansson, and J. Suorsa Using methods based on conformal field theory, we construct model wave functions on a torus with arbitrary flat metric for all chiral states in the abelian quantum Hall hierarchy. These functions have no variational parameters, and they transform under the modular group in the same way as the multic... [Phys. Rev. B 89, 125303] Published Wed Mar 12, 2014

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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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Publikationsdatum: 2014-03-13

Beschreibung: 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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Publikationsdatum: 2014-03-13

Beschreibung: 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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Beschreibung: 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

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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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Beschreibung: 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

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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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Beschreibung: 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

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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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Publikationsdatum: 2014-03-14

Beschreibung: 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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Publikationsdatum: 2014-03-14

Beschreibung: 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

Schlagwort(e): Condensed Matter: Electronic Properties, etc.

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Thema: Physik

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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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Publikationsdatum: 2014-03-14

Beschreibung: 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

Schlagwort(e): Condensed Matter: Electronic Properties, etc.

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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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Publikationsdatum: 2014-05-02

Beschreibung: 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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Coulomb interaction effects on the terahertz photon-assisted tunneling through an InAs quantum dot (2014)

R.-Y. Yuan, G.-B. Zhu, X. Zhao, Y. Guo, H. Yan, Q. Sun, and A.-C. Ji

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-05-03

Beschreibung: Author(s): R.-Y. Yuan, G.-B. Zhu, X. Zhao, Y. Guo, H. Yan, Q. Sun, and A.-C. Ji Recently, the terahertz (THz) photon-assisted tunneling (PAT) through a two-level InAs quantum dot (QD) has been successfully realized in experiment [Phys. Rev. Lett. 109, 077401 (2012)]. The Coulomb interaction in this device is comparable with the energy difference between the two energy levels. W... [Phys. Rev. B 89, 195301] Published Fri May 02, 2014

Schlagwort(e): Semiconductors II: surfaces, interfaces, microstructures, and related topics

Print ISSN: 1098-0121

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Thema: Physik

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Structural stability and topological surface states of the SnTe (111) surface (2014)

Jianfeng Wang, Junwei Liu, Yong Xu, Jian Wu, Bing-Lin Gu, and Wenhui Duan

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-21

Beschreibung: Author(s): Jianfeng Wang, Junwei Liu, Yong Xu, Jian Wu, Bing-Lin Gu, and Wenhui Duan We perform first-principles calculations to study the stability and electronic structure of the (111) surface of SnTe, a representative topological crystalline insulator (TCI). We find three stable surface phases, which support two qualitatively different types of topological surface states: type I ... [Phys. Rev. B 89, 125308] Published Thu Mar 20, 2014

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Many-Body Renormalization of the Minimal Conductivity in Graphene (2014)

F. Guinea and M. I. Katsnelson

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2014-03-21

Beschreibung: Author(s): F. Guinea and M. I. Katsnelson The conductance of ballistic graphene at the neutrality point is due to coherent electron tunneling between the leads, the so called pseudodiffusive regime. The conductance scales as a function of the sample dimensions in the same way as in a diffusive metal, despite the difference in the physical m... [Phys. Rev. Lett. 112, 116604] Published Thu Mar 20, 2014

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Experimental Observation of Dirac-like Surface States and Topological Phase Transition in Pb1−xSnxTe(111) Films (2014)

Chenhui Yan, Junwei Liu, Yunyi Zang, Jianfeng Wang, Zhenyu Wang, Peng Wang, Zhi-Dong Zhang, Lili Wang, Xucun Ma, Shuaihua Ji, Ke He, Liang Fu, Wenhui Duan, Qi-Kun Xue, and Xi Chen

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2014-05-06

Beschreibung: Author(s): Chenhui Yan, Junwei Liu, Yunyi Zang, Jianfeng Wang, Zhenyu Wang, Peng Wang, Zhi-Dong Zhang, Lili Wang, Xucun Ma, Shuaihua Ji, Ke He, Liang Fu, Wenhui Duan, Qi-Kun Xue, and Xi Chen The surface of a topological crystalline insulator (TCI) carries an even number of Dirac cones protected by crystalline symmetry. We epitaxially grew high-quality Pb1−xSnxTe(111) films and investigated the TCI phase by in situ angle-resolved photoemission spectroscopy. Pb1−xSnxTe(111) films undergo ... [Phys. Rev. Lett. 112, 186801] Published Mon May 05, 2014

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Electrically and Mechanically Tunable Electron Spins in Silicon Carbide Color Centers (2014)

Abram L. Falk, Paul V. Klimov, Bob B. Buckley, Viktor Ivády, Igor A. Abrikosov, Greg Calusine, William F. Koehl, Ádám Gali, and David D. Awschalom

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2014-05-06

Beschreibung: Author(s): Abram L. Falk, Paul V. Klimov, Bob B. Buckley, Viktor Ivády, Igor A. Abrikosov, Greg Calusine, William F. Koehl, Ádám Gali, and David D. Awschalom The electron spins of semiconductor defects can have complex interactions with their host, particularly in polar materials like SiC where electrical and mechanical variables are intertwined. By combining pulsed spin resonance with ab initio simulations, we show that spin-spin interactions in 4H-SiC ... [Phys. Rev. Lett. 112, 187601] Published Mon May 05, 2014

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Ultrathin GaN nanowires: Electronic, thermal, and thermoelectric properties (2014)

A. H. Davoody, E. B. Ramayya, L. N. Maurer, and I. Knezevic

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-20

Beschreibung: Author(s): A. H. Davoody, E. B. Ramayya, L. N. Maurer, and I. Knezevic We present a comprehensive computational study of the electronic, thermal, and thermoelectric (TE) properties of gallium nitride nanowires (NWs) over a wide range of thicknesses (3–9 nm), doping densities (1018–1020 cm−3), and temperatures (300–1000 K). We calculate the low-field electron mobility b... [Phys. Rev. B 89, 115313] Published Wed Mar 19, 2014

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Ground-state degeneracy for Abelian anyons in the presence of gapped boundaries (2014)

Anton Kapustin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-20

Beschreibung: Author(s): Anton Kapustin Gapped phases with long-range entanglement may admit gapped boundaries. If the boundary is gapped, the ground-state degeneracy is well defined and can be computed using methods of topological quantum field theory. We derive a general formula for the ground-state degeneracy for Abelian fractional qua... [Phys. Rev. B 89, 125307] Published Wed Mar 19, 2014

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