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Analytic Flow Equations for the Fermi Liquid Parameters of the Anderson Impurity Model (2015)

Vassilis Pandis and Alex C. Hewson

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-11

Description: Author(s): Vassilis Pandis and Alex C. Hewson The low temperature behavior of a Fermi liquid can be described in terms of quasiparticle excitations that are in 1-1 correspondence with those of the noninteracting system. Because of adiabatic continuity, the Landau parameters, which describe the interactions between the quasiparticles, must evolv… [Phys. Rev. Lett. 115, 076401] Published Mon Aug 10, 2015

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Quantum Spin Liquid Emerging from Antiferromagnetic Order by Introducing Disorder (2015)

T. Furukawa, K. Miyagawa, T. Itou, M. Ito, H. Taniguchi, M. Saito, S. Iguchi, T. Sasaki, and K. Kanoda

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-12

Description: Author(s): T. Furukawa, K. Miyagawa, T. Itou, M. Ito, H. Taniguchi, M. Saito, S. Iguchi, T. Sasaki, and K. Kanoda Quantum spin liquids, which are spin versions of quantum matter, have been sought after in systems with geometrical frustration. We show that disorder drives a classical magnet into a quantum spin liquid through conducting NMR experiments on an organic Mott insulator, κ − ( ET ) 2 Cu [ N ( CN ) 2 ] Cl . Antiferrom… [Phys. Rev. Lett. 115, 077001] Published Tue Aug 11, 2015

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Hot-Electron Intraband Luminescence from Single Hot Spots in Noble-Metal Nanoparticle Films (2015)

Tobias Haug, Philippe Klemm, Sebastian Bange, and John M. Lupton

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-08

Description: Author(s): Tobias Haug, Philippe Klemm, Sebastian Bange, and John M. Lupton Visible light emission from silver and gold nanoparticle films irradiated with ultrashort infrared pulses is governed by hot electron recombination within the conduction band. [Phys. Rev. Lett. 115, 067403] Published Fri Aug 07, 2015

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Tunneling Processes into Localized Subgap States in Superconductors (2015)

Michael Ruby, Falko Pientka, Yang Peng, Felix von Oppen, Benjamin W. Heinrich, and Katharina J. Franke

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-21

Description: Author(s): Michael Ruby, Falko Pientka, Yang Peng, Felix von Oppen, Benjamin W. Heinrich, and Katharina J. Franke We combine scanning-tunneling-spectroscopy experiments probing magnetic impurities on a superconducting surface with a theoretical analysis of the tunneling processes between (superconducting) tip and substrate. We show that the current through impurity-induced Shiba bound states is carried by singl… [Phys. Rev. Lett. 115, 087001] Published Thu Aug 20, 2015

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Layered Topological Crystalline Insulators (2015)

Youngkuk Kim, C. L. Kane, E. J. Mele, and Andrew M. Rappe

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-21

Description: Author(s): Youngkuk Kim, C. L. Kane, E. J. Mele, and Andrew M. Rappe Topological crystalline insulators (TCIs) are insulating materials whose topological property relies on generic crystalline symmetries. Based on first-principles calculations, we study a three-dimensional (3D) crystal constructed by stacking two-dimensional TCI layers. Depending on the interlayer in… [Phys. Rev. Lett. 115, 086802] Published Thu Aug 20, 2015

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X-ray Detection of Transient Magnetic Moments Induced by a Spin Current in Cu (2015)

R. Kukreja, S. Bonetti, Z. Chen, D. Backes, Y. Acremann, J. A. Katine, A. D. Kent, H. A. Dürr, H. Ohldag, and J. Stöhr

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-25

Description: Author(s): R. Kukreja, S. Bonetti, Z. Chen, D. Backes, Y. Acremann, J. A. Katine, A. D. Kent, H. A. Dürr, H. Ohldag, and J. Stöhr X-ray magnetic circular dichroism detects the transient magnetic moments that are induced in a nonmagnetic material by spin injection from a ferromagnet. [Phys. Rev. Lett. 115, 096601] Published Mon Aug 24, 2015

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Accessing Phonon Polaritons in Hyperbolic Crystals by Angle-Resolved Photoemission Spectroscopy (2015)

Andrea Tomadin, Alessandro Principi, Justin C. W. Song, Leonid S. Levitov, and Marco Polini

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-22

Description: Author(s): Andrea Tomadin, Alessandro Principi, Justin C. W. Song, Leonid S. Levitov, and Marco Polini Recently studied hyperbolic materials host unique phonon-polariton (PP) modes. The ultrashort wavelengths of these modes, as well as their low damping, hold promise for extreme subdiffraction nanophotonics schemes. Polar hyperbolic materials such as hexagonal boron nitride can be used to realize lon… [Phys. Rev. Lett. 115, 087401] Published Fri Aug 21, 2015

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Tracking Primary Thermalization Events in Graphene with Photoemission at Extreme Time Scales (2015)

I. Gierz, F. Calegari, S. Aeschlimann, M. Chávez Cervantes, C. Cacho, R. T. Chapman, E. Springate, S. Link, U. Starke, C. R. Ast, and A. Cavalleri

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-22

Description: Author(s): I. Gierz, F. Calegari, S. Aeschlimann, M. Chávez Cervantes, C. Cacho, R. T. Chapman, E. Springate, S. Link, U. Starke, C. R. Ast, and A. Cavalleri Ultrafast dynamics of photoexcited electron-hole pairs produced by subfemtosecond pulses in graphene may have implications for petahertz electronic and optoelectronic devices. [Phys. Rev. Lett. 115, 086803] Published Fri Aug 21, 2015

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Evidence for Half-Metallicity in n-type HgCr_{2} Se_{4} (2015)

Tong Guan, Chaojing Lin, Chongli Yang, Youguo Shi, Cong Ren, Yongqing Li, Hongming Weng, Xi Dai, Zhong Fang, Shishen Yan, and Peng Xiong

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-22

Description: Author(s): Tong Guan, Chaojing Lin, Chongli Yang, Youguo Shi, Cong Ren, Yongqing Li, Hongming Weng, Xi Dai, Zhong Fang, Shishen Yan, and Peng Xiong High quality HgCr 2 Se 4 single crystals have been investigated by magnetization, electron transport, and Andreev reflection spectroscopy. In the ferromagnetic ground state, the saturation magnetic moment of each unit cell corresponds to an integer number of electron spins ( 3 μ B / Cr 3 + ), and the Hall ef… [Phys. Rev. Lett. 115, 087002] Published Fri Aug 21, 2015

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Decoherence of Near-Surface Nitrogen-Vacancy Centers Due to Electric Field Noise (2015)

M. Kim, H. J. Mamin, M. H. Sherwood, K. Ohno, D. D. Awschalom, and D. Rugar

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-22

Description: Author(s): M. Kim, H. J. Mamin, M. H. Sherwood, K. Ohno, D. D. Awschalom, and D. Rugar We show that electric field noise from surface charge fluctuations can be a significant source of spin decoherence for near-surface nitrogen-vacancy (NV) centers in diamond. This conclusion is based on the increase in spin coherence observed when the diamond surface is covered with high-dielectric-c… [Phys. Rev. Lett. 115, 087602] Published Fri Aug 21, 2015

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Efficient Cluster Algorithm for Spin Glasses in Any Space Dimension (2015)

Zheng Zhu, Andrew J. Ochoa, and Helmut G. Katzgraber

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-15

Description: Author(s): Zheng Zhu, Andrew J. Ochoa, and Helmut G. Katzgraber Spin systems with frustration and disorder are notoriously difficult to study, both analytically and numerically. While the simulation of ferromagnetic statistical mechanical models benefits greatly from cluster algorithms, these accelerated dynamics methods remain elusive for generic spin-glass-lik… [Phys. Rev. Lett. 115, 077201] Published Fri Aug 14, 2015

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Numerical Evidence of Quantum Melting of Spin Ice: Quantum-to-Classical Crossover (2015)

Yasuyuki Kato and Shigeki Onoda

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-15

Description: Author(s): Yasuyuki Kato and Shigeki Onoda Unbiased quantum Monte Carlo simulations are performed on the nearest-neighbor spin- 1 2 pyrochlore X X Z model with an antiferromagnetic longitudinal and the weak ferromagnetic transverse exchange couplings, J and J ⊥ . The specific heat exhibits a broad peak at T CSI ∼ 0.2 J associated with a crossover to a… [Phys. Rev. Lett. 115, 077202] Published Fri Aug 14, 2015

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Collective Modes and Structural Modulation in Ni-Mn-Ga(Co) Martensite Thin Films Probed by Femtosecond Spectroscopy and Scanning Tunneling Microscopy (2015)

M. Schubert, H. Schaefer, J. Mayer, A. Laptev, M. Hettich, M. Merklein, C. He, C. Rummel, O. Ristow, M. Großmann, Y. Luo, V. Gusev, K. Samwer, M. Fonin, T. Dekorsy, and J. Demsar

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-15

Description: Author(s): M. Schubert, H. Schaefer, J. Mayer, A. Laptev, M. Hettich, M. Merklein, C. He, C. Rummel, O. Ristow, M. Großmann, Y. Luo, V. Gusev, K. Samwer, M. Fonin, T. Dekorsy, and J. Demsar The origin of the martensitic transition in the magnetic shape memory alloy Ni-Mn-Ga has been widely discussed. While several studies suggest it is electronically driven, the adaptive martensite model reproduced the peculiar nonharmonic lattice modulation. We used femtosecond spectroscopy to probe t… [Phys. Rev. Lett. 115, 076402] Published Thu Aug 13, 2015

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Reconfigurable Quantum-Dot Molecules Created by Atom Manipulation (2015)

Yi Pan, Jianshu Yang, Steven C. Erwin, Kiyoshi Kanisawa, and Stefan Fölsch

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-15

Description: Author(s): Yi Pan, Jianshu Yang, Steven C. Erwin, Kiyoshi Kanisawa, and Stefan Fölsch Quantum-dot molecules were constructed on a semiconductor surface using atom manipulation by scanning tunneling microscopy (STM) at 5 K. The molecules consist of several coupled quantum dots, each of which comprises a chain of charged adatoms that electrostatically confines intrinsic surface-state e… [Phys. Rev. Lett. 115, 076803] Published Fri Aug 14, 2015

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Interaction of Strain and Nuclear Spins in Silicon: Quadrupolar Effects on Ionized Donors (2015)

David P. Franke, Florian M. Hrubesch, Markus Künzl, Hans-Werner Becker, Kohei M. Itoh, Martin Stutzmann, Felix Hoehne, Lukas Dreher, and Martin S. Brandt

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-07-30

Description: Author(s): David P. Franke, Florian M. Hrubesch, Markus Künzl, Hans-Werner Becker, Kohei M. Itoh, Martin Stutzmann, Felix Hoehne, Lukas Dreher, and Martin S. Brandt The interaction between the nuclear quadrupole moment of Arsenic and an electric field gradient can be manipulated by applying an elastic strain to the host silicon crystal. This technique could allow for mechanical tuning of qubits. [Phys. Rev. Lett. 115, 057601] Published Wed Jul 29, 2015

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Large Superconducting Spin Valve Effect and Ultrasmall Exchange Splitting in Epitaxial Rare-Earth-Niobium Trilayers (2015)

Yuanzhou Gu, Gábor B. Halász, J. W. A. Robinson, and M. G. Blamire

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-04

Description: Author(s): Yuanzhou Gu, Gábor B. Halász, J. W. A. Robinson, and M. G. Blamire Epitaxial Ho / Nb / Ho and Dy / Nb / Dy superconducting spin valves show a reversible change in the zero-field critical temperature ( Δ T c 0 ) of ∼ 400 mK and an infinite magnetoresistance on changing the relative magnetization of the Ho or Dy layers. Unlike transition-metal superconducting spin valves, which s… [Phys. Rev. Lett. 115, 067201] Published Mon Aug 03, 2015

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Surface and Step Conductivities on Si(111) Surfaces (2015)

Sven Just, Marcus Blab, Stefan Korte, Vasily Cherepanov, Helmut Soltner, and Bert Voigtländer

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-04

Description: Author(s): Sven Just, Marcus Blab, Stefan Korte, Vasily Cherepanov, Helmut Soltner, and Bert Voigtländer Four-point measurements using a multitip scanning tunneling microscope are carried out in order to determine surface and step conductivities on Si(111) surfaces. In a first step, distance-dependent four-point measurements in the linear configuration are used in combination with an analytical three-l… [Phys. Rev. Lett. 115, 066801] Published Mon Aug 03, 2015

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Linear Scaling of the Exciton Binding Energy versus the Band Gap of Two-Dimensional Materials (2015)

Jin-Ho Choi, Ping Cui, Haiping Lan, and Zhenyu Zhang

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-08

Description: Author(s): Jin-Ho Choi, Ping Cui, Haiping Lan, and Zhenyu Zhang The exciton is one of the most crucial physical entities in the performance of optoelectronic and photonic devices, and widely varying exciton binding energies have been reported in different classes of materials. Using first-principles calculations within the G W –Bethe-Salpeter equation approach, he… [Phys. Rev. Lett. 115, 066403] Published Fri Aug 07, 2015

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Strain Induced Vortex Core Switching in Planar Magnetostrictive Nanostructures (2015)

T. A. Ostler, R. Cuadrado, R. W. Chantrell, A. W. Rushforth, and S. A. Cavill

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-08

Description: Author(s): T. A. Ostler, R. Cuadrado, R. W. Chantrell, A. W. Rushforth, and S. A. Cavill The dynamics of magnetic vortex cores is of great interest because the gyrotropic mode has applications in spin torque driven magnetic microwave oscillators, and also provides a means to flip the direction of the core for use in magnetic storage devices. Here, we propose a new means of stimulating m… [Phys. Rev. Lett. 115, 067202] Published Fri Aug 07, 2015

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Line Degeneracy and Strong Spin-Orbit Coupling of Light with Bulk Bianisotropic Metamaterials (2015)

Qinghua Guo, Wenlong Gao, Jing Chen, Yongmin Liu, and Shuang Zhang

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-08

Description: Author(s): Qinghua Guo, Wenlong Gao, Jing Chen, Yongmin Liu, and Shuang Zhang Propagation of light in a medium is dictated by equifrequency surfaces (EFSs), which play a similar role as Fermi surfaces for electrons in crystals. Engineering the equifrequency surface of light through structuring a photonic medium enables superior control over light propagation that goes beyond … [Phys. Rev. Lett. 115, 067402] Published Fri Aug 07, 2015

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Tunable Spin-Qubit Coupling Mediated by a Multielectron Quantum Dot (2015)

V. Srinivasa, H. Xu, and J. M. Taylor

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-06-06

Description: Author(s): V. Srinivasa, H. Xu, and J. M. Taylor We present an approach for entangling electron spin qubits localized on spatially separated impurity atoms or quantum dots via a multielectron, two-level quantum dot. The effective exchange interaction mediated by the dot can be understood as the simplest manifestation of Ruderman-Kittel-Kasuya-Yosi... [Phys. Rev. Lett. 114, 226803] Published Thu Jun 04, 2015

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Helical Spin Order from Topological Dirac and Weyl Semimetals (2015)

Xiao-Qi Sun, Shou-Cheng Zhang, and Zhong Wang

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-15

Description: Author(s): Xiao-Qi Sun, Shou-Cheng Zhang, and Zhong Wang We study dynamical mass generation and the resultant helical spin orders in topological Dirac and Weyl semimetals, including the edge states of quantum spin Hall insulators, the surface states of weak topological insulators, and the bulk materials of Weyl semimetals. In particular, the helical spin … [Phys. Rev. Lett. 115, 076802] Published Thu Aug 13, 2015

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Origin of the Anomalous Mass Renormalization in Metallic Quantum Well States of Strongly Correlated Oxide SrVO_{3} (2015)

Masaki Kobayashi, Kohei Yoshimatsu, Enju Sakai, Miho Kitamura, Koji Horiba, Atsushi Fujimori, and Hiroshi Kumigashira

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-15

Description: Author(s): Masaki Kobayashi, Kohei Yoshimatsu, Enju Sakai, Miho Kitamura, Koji Horiba, Atsushi Fujimori, and Hiroshi Kumigashira In situ angle-resolved photoemission spectroscopy (ARPES) has been performed on SrVO 3 ultrathin films, which show metallic quantum well (QW) states, to unveil the origin of the anomalous mass enhancement in the QW subbands. The line-shape analysis of the ARPES spectra reveals that the strength of th… [Phys. Rev. Lett. 115, 076801] Published Thu Aug 13, 2015

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Anderson Localization and the Quantum Phase Diagram of Three Dimensional Disordered Dirac Semimetals (2015)

J. H. Pixley, Pallab Goswami, and S. Das Sarma

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-12

Description: Author(s): J. H. Pixley, Pallab Goswami, and S. Das Sarma We study the quantum phase diagram of a three dimensional noninteracting Dirac semimetal in the presence of either quenched axial or scalar potential disorder, by calculating the average and the typical density of states as well as the inverse participation ratio using numerically exact methods. We … [Phys. Rev. Lett. 115, 076601] Published Tue Aug 11, 2015

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Spin Hall Effects Due to Phonon Skew Scattering (2015)

Cosimo Gorini, Ulrich Eckern, and Roberto Raimondi

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-15

Description: Author(s): Cosimo Gorini, Ulrich Eckern, and Roberto Raimondi A diversity of spin Hall effects in metallic systems is known to rely on Mott skew scattering. In this work its high-temperature counterpart, phonon skew scattering, which is expected to be of foremost experimental relevance, is investigated. In particular, the phonon skew scattering spin Hall condu… [Phys. Rev. Lett. 115, 076602] Published Fri Aug 14, 2015

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Candidate Source of Flux Noise in SQUIDs: Adsorbed Oxygen Molecules (2015)

Hui Wang, Chuntai Shi, Jun Hu, Sungho Han, Clare C. Yu, and R. Q. Wu

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-15

Description: Author(s): Hui Wang, Chuntai Shi, Jun Hu, Sungho Han, Clare C. Yu, and R. Q. Wu A major obstacle to using superconducting quantum interference devices (SQUIDs) as qubits is flux noise. We propose that the heretofore mysterious spins producing flux noise could be O 2 molecules adsorbed on the surface. Using density functional theory calculations, we find that an O 2 molecule adsor… [Phys. Rev. Lett. 115, 077002] Published Fri Aug 14, 2015

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Controlled Strong Coupling and Absence of Dark Polaritons in Microcavities with Double Quantum Wells (2015)

K. Sivalertporn and E. A. Muljarov

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-15

Description: Author(s): K. Sivalertporn and E. A. Muljarov We demonstrate an efficient switching between strong and weak exciton-photon coupling regimes in microcavity-embedded asymmetric double quantum wells, controlled by an applied electric field. We show that a fine-tuning of the electric field leads to drastic changes in the polariton properties, with … [Phys. Rev. Lett. 115, 077401] Published Fri Aug 14, 2015

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Gigantic Surface Lifetime of an Intrinsic Topological Insulator (2015)

Madhab Neupane, Su-Yang Xu, Yukiaki Ishida, Shuang Jia, Benjamin M. Fregoso, Chang Liu, Ilya Belopolski, Guang Bian, Nasser Alidoust, Tomasz Durakiewicz, Victor Galitski, Shik Shin, Robert J. Cava, and M. Zahid Hasan

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-09-10

Description: Author(s): Madhab Neupane, Su-Yang Xu, Yukiaki Ishida, Shuang Jia, Benjamin M. Fregoso, Chang Liu, Ilya Belopolski, Guang Bian, Nasser Alidoust, Tomasz Durakiewicz, Victor Galitski, Shik Shin, Robert J. Cava, and M. Zahid Hasan Exceptionally long-lived excited surface states are found in the topological insulator Bi 2 Te 2 Se, with the state persisting for microseconds. [Phys. Rev. Lett. 115, 116801] Published Wed Sep 09, 2015

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Antiferroquadrupolar and Ising-Nematic Orders of a Frustrated Bilinear-Biquadratic Heisenberg Model and Implications for the Magnetism of FeSe (2015)

Rong Yu and Qimiao Si

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-09-10

Description: Author(s): Rong Yu and Qimiao Si Motivated by the properties of the iron chalcogenides, we study the phase diagram of a generalized Heisenberg model with frustrated bilinear-biquadratic interactions on a square lattice. We identify zero-temperature phases with antiferroquadrupolar and Ising-nematic orders. The effects of quantum fl… [Phys. Rev. Lett. 115, 116401] Published Tue Sep 08, 2015

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Superconducting Fluctuations in the Normal State of the Two-Dimensional Hubbard Model (2015)

Xi Chen, J. P. F. Le; Blanc, and Emanuel Gull

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-09-10

Description: Author(s): Xi Chen, J. P. F. LeBlanc, and Emanuel Gull We compute the two-particle quantities relevant for superconducting correlations in the two-dimensional Hubbard model within the dynamical cluster approximation. In the normal state we identify the parameter regime in density, interaction, and second-nearest-neighbor hopping strength that maximizes … [Phys. Rev. Lett. 115, 116402] Published Wed Sep 09, 2015

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Bosonic Integer Quantum Hall Effect in Optical Flux Lattices (2015)

A. Sterdyniak, Nigel R. Cooper, and N. Regnault

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-09-11

Description: Author(s): A. Sterdyniak, Nigel R. Cooper, and N. Regnault In two dimensions strongly interacting bosons in a magnetic field can realize a bosonic integer quantum Hall state, the simplest two-dimensional example of a symmetry-protected topological phase. We propose a realistic implementation of this phase using an optical flux lattice. Through exact diagona… [Phys. Rev. Lett. 115, 116802] Published Thu Sep 10, 2015

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Magnetoanisotropic Andreev Reflection in Ferromagnet-Superconductor Junctions (2015)

Petra Högl, Alex Matos-Abiague, Igor Žutić, and Jaroslav Fabian

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-09-11

Description: Author(s): Petra Högl, Alex Matos-Abiague, Igor Žutić, and Jaroslav Fabian Andreev reflection spectroscopy of ferromagnet-supercondutor (FS) junctions is an important probe of spin polarization. We theoretically investigate spin-polarized transport in FS junctions in the presence of Rashba and Dresselhaus interfacial spin-orbit fields and show that Andreev reflection can b… [Phys. Rev. Lett. 115, 116601] Published Thu Sep 10, 2015

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Bosonic Integer Quantum Hall Effect in an Interacting Lattice Model (2015)

Yin-Chen He, Subhro Bhattacharjee, R. Moessner, and Frank Pollmann

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-09-11

Description: Author(s): Yin-Chen He, Subhro Bhattacharjee, R. Moessner, and Frank Pollmann We study a bosonic model with correlated hopping on a honeycomb lattice, and show that its ground state is a bosonic integer quantum Hall (BIQH) phase, a prominent example of a symmetry-protected topological (SPT) phase. By using the infinite density matrix renormalization group method, we establish… [Phys. Rev. Lett. 115, 116803] Published Thu Sep 10, 2015

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Semiconductor-Nanowire-Based Superconducting Qubit (2015)

T. W. Larsen, K. D. Petersson, F. Kuemmeth, T. S. Jespersen, P. Krogstrup, J. Nygård, and C. M. Marcus

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-09-15

Description: Author(s): T. W. Larsen, K. D. Petersson, F. Kuemmeth, T. S. Jespersen, P. Krogstrup, J. Nygård, and C. M. Marcus A qubit made of a semiconducting nanowire sandwiched between two superconductors could simplify the design of quantum information processing architectures. [Phys. Rev. Lett. 115, 127001] Published Mon Sep 14, 2015

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Melting of Three-Sublattice Order in Easy-Axis Antiferromagnets on Triangular and Kagome Lattices (2015)

Kedar Damle

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-09-17

Description: Author(s): Kedar Damle When the constituent spins have an energetic preference to lie along an easy axis, triangular and kagome lattice antiferromagnets often develop long-range order that distinguishes the three sublattices of the underlying triangular Bravais lattice. In zero magnetic field, this three-sublattice order … [Phys. Rev. Lett. 115, 127204] Published Wed Sep 16, 2015

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Electrical Tuning of Exciton Binding Energies in Monolayer WS_{2} (2015)

Alexey Chernikov, Arend M. van der Zande, Heather M. Hill, Albert F. Rigosi, Ajanth Velauthapillai, James Hone, and Tony F. Heinz

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-09-17

Description: Author(s): Alexey Chernikov, Arend M. van der Zande, Heather M. Hill, Albert F. Rigosi, Ajanth Velauthapillai, James Hone, and Tony F. Heinz An externally applied voltage in a transistor device can continuously tune the binding energy of excitons in monolayer WS 2 . [Phys. Rev. Lett. 115, 126802] Published Wed Sep 16, 2015

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Optical Diode Effect at Spin-Wave Excitations of the Room-Temperature Multiferroic BiFeO_{3} (2015)

I. Kézsmárki, U. Nagel, S. Bordács, R. S. Fishman, J. H. Lee, Hee Taek Yi, S.-W. Cheong, and T. Rõõm

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-09-17

Description: Author(s): I. Kézsmárki, U. Nagel, S. Bordács, R. S. Fishman, J. H. Lee, Hee Taek Yi, S.-W. Cheong, and T. Rõõm Multiferroics permit the magnetic control of the electric polarization and the electric control of the magnetization. These static magnetoelectric (ME) effects are of enormous interest: The ability to read and write a magnetic state current-free by an electric voltage would provide a huge technologi… [Phys. Rev. Lett. 115, 127203] Published Tue Sep 15, 2015

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Alloy Engineering of Defect Properties in Semiconductors: Suppression of Deep Levels in Transition-Metal Dichalcogenides (2015)

Bing Huang, Mina Yoon, Bobby G. Sumpter, Su-Huai Wei, and Feng Liu

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-09-19

Description: Author(s): Bing Huang, Mina Yoon, Bobby G. Sumpter, Su-Huai Wei, and Feng Liu Developing practical approaches to effectively reduce the amount of deep defect levels in semiconductors is critical for their use in electronic and optoelectronic devices, but this still remains a very challenging task. In this Letter, we propose that specific alloying can provide an effective mean… [Phys. Rev. Lett. 115, 126806] Published Fri Sep 18, 2015

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Fractional Quantum Hall States at ν=13/5 and 12/5 and Their Non-Abelian Nature (2015)

W. Zhu, S. S. Gong, F. D. M. Haldane, and D. N. Sheng

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-09-19

Description: Author(s): W. Zhu, S. S. Gong, F. D. M. Haldane, and D. N. Sheng Topological quantum states with non-Abelian Fibonacci anyonic excitations are widely sought after for the exotic fundamental physics they would exhibit, and for universal quantum computing applications. The fractional quantum Hall (FQH) state at a filling factor of ν = 12 / 5 is a promising candidate; h… [Phys. Rev. Lett. 115, 126805] Published Fri Sep 18, 2015

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Projected Dipole Model for Quantum Plasmonics (2015)

Wei Yan, Martijn Wubs, and N. Asger Mortensen

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-09-24

Description: Author(s): Wei Yan, Martijn Wubs, and N. Asger Mortensen Quantum effects of plasmonic phenomena have been explored through ab initio studies, but only for exceedingly small metallic nanostructures, leaving most experimentally relevant structures too large to handle. We propose instead an effective description with the computationally appealing features of… [Phys. Rev. Lett. 115, 137403] Published Wed Sep 23, 2015

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Semiconducting Graphene from Highly Ordered Substrate Interactions (2015)

M. S. Nevius, M. Conrad, F. Wang, A. Celis, M. N. Nair, A. Taleb-Ibrahimi, A. Tejeda, and E. H. Conrad

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-09-24

Description: Author(s): M. S. Nevius, M. Conrad, F. Wang, A. Celis, M. N. Nair, A. Taleb-Ibrahimi, A. Tejeda, and E. H. Conrad Researchers have engineered a large energy band gap in a graphene layer grown on a silicon carbide substrate. [Phys. Rev. Lett. 115, 136802] Published Mon Sep 21, 2015

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Dynamical Mean-Field Theory Plus Numerical Renormalization-Group Study of Spin-Orbital Separation in a Three-Band Hund Metal (2015)

K. M. Stadler, Z. P. Yin, J. von Delft, G. Kotliar, and A. Weichselbaum

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-09-24

Description: Author(s): K. M. Stadler, Z. P. Yin, J. von Delft, G. Kotliar, and A. Weichselbaum We show that the numerical renormalization group is a viable multi-band impurity solver for dynamical mean-field theory (DMFT), offering unprecedented real-frequency spectral resolution at arbitrarily low energies and temperatures. We use it to obtain a numerically exact DMFT solution to the Hund me… [Phys. Rev. Lett. 115, 136401] Published Tue Sep 22, 2015

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Competing Magnetic Fluctuations in Iron Pnictide Superconductors: Role of Ferromagnetic Spin Correlations Revealed by NMR (2015)

P. Wiecki, B. Roy, D. C. Johnston, S. L. Bud’ko, P. C. Canfield, and Y. Furukawa

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-09-24

Description: Author(s): P. Wiecki, B. Roy, D. C. Johnston, S. L. Bud’ko, P. C. Canfield, and Y. Furukawa In the iron pnictide superconductors, theoretical calculations have consistently shown enhancements of the static magnetic susceptibility at both the stripe-type antiferromagnetic and in-plane ferromagnetic (FM) wave vectors. However, the possible existence of FM fluctuations has not yet been examin… [Phys. Rev. Lett. 115, 137001] Published Tue Sep 22, 2015

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Fully Parameter-Free Calculation of Optical Spectra for Insulators, Semiconductors, and Metals from a Simple Polarization Functional (2015)

J. A. Berger

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-09-24

Description: Author(s): J. A. Berger We present a fully parameter-free density-functional approach for the accurate description of optical absorption spectra of insulators, semiconductors, and metals. We show that this can be achieved within time-dependent current-density-functional theory using a simple dynamical polarization function… [Phys. Rev. Lett. 115, 137402] Published Tue Sep 22, 2015

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Electric Field Control of Spin Lifetimes in Nb−SrTiO_{3} by Spin-Orbit Fields (2015)

A. M. Kamerbeek, P. Högl, J. Fabian, and T. Banerjee

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-09-25

Description: Author(s): A. M. Kamerbeek, P. Högl, J. Fabian, and T. Banerjee We show electric field control of the spin accumulation at the interface of the oxide semiconductor Nb − SrTiO 3 with Co / AlO x spin injection contacts at room temperature. The in-plane spin lifetime τ ∥ , as well as the ratio of the out-of-plane to in-plane spin lifetime τ ⊥ / τ ∥ , is manipulated by the built… [Phys. Rev. Lett. 115, 136601] Published Thu Sep 24, 2015

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Local Spectroscopic Characterization of Spin and Layer Polarization in WSe_{2} (2015)

Matthew Yankowitz, Devin McKenzie, and Brian J. Le; Roy

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-09-25

Description: Author(s): Matthew Yankowitz, Devin McKenzie, and Brian J. LeRoy Tunneling spectroscopy exhibits suppression of intervalley electronic scattering in the valence band of a monolayer of the transition metal dichalcogenide WSe 2 . [Phys. Rev. Lett. 115, 136803] Published Thu Sep 24, 2015

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Successive Magnetic-Field-Induced Transitions and Colossal Magnetoelectric Effect in Ni_{3} TeO_{6} (2015)

Jae Wook Kim, S. Artyukhin, E. D. Mun, M. Jaime, N. Harrison, A. Hansen, J. J. Yang, Y. S. Oh, D. Vanderbilt, V. S. Zapf, and S.-W. Cheong

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-09-25

Description: Author(s): Jae Wook Kim, S. Artyukhin, E. D. Mun, M. Jaime, N. Harrison, A. Hansen, J. J. Yang, Y. S. Oh, D. Vanderbilt, V. S. Zapf, and S.-W. Cheong We report the discovery of a metamagnetic phase transition in a polar antiferromagnet Ni 3 TeO 6 that occurs at 52 T. The new phase transition accompanies a colossal magnetoelectric effect, with a magnetic-field-induced polarization change of 0.3 μ C / cm 2 , a value that is 4 times larger than for the spi… [Phys. Rev. Lett. 115, 137201] Published Thu Sep 24, 2015

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Band Engineering of Dirac Surface States in Topological-Insulator-Based van der Waals Heterostructures (2015)

Cui-Zu Chang, Peizhe Tang, Xiao Feng, Kang Li, Xu-Cun Ma, Wenhui Duan, Ke He, and Qi-Kun Xue

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-09-25

Description: Author(s): Cui-Zu Chang, Peizhe Tang, Xiao Feng, Kang Li, Xu-Cun Ma, Wenhui Duan, Ke He, and Qi-Kun Xue The existence of a gapless Dirac surface band of a three dimensional (3D) topological insulator (TI) is guaranteed by the nontrivial topological character of the bulk band, yet the surface band dispersion is mainly determined by the environment near the surface. In this Letter , through in situ angle… [Phys. Rev. Lett. 115, 136801] Published Wed Sep 23, 2015

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Ferromagnetic Spin Fluctuation and Unconventional Superconductivity in Rb_{2} Cr_{3} As_{3} Revealed by ^{75} As NMR and NQR (2015)

J. Yang, Z. T. Tang, G. H. Cao, and Guo-qing Zheng

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-09-30

Description: Author(s): J. Yang, Z. T. Tang, G. H. Cao, and Guo-qing Zheng We report As 75 nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) studies on the superconductor Rb 2 Cr 3 As 3 with a quasi-one-dimensional crystal structure. Below T ∼ 100 K , the spin-lattice relaxation rate ( 1 / T 1 ) divided by temperature, 1 / T 1 T , increases upon cooling down to T c = 4.8 … [Phys. Rev. Lett. 115, 147002] Published Tue Sep 29, 2015

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Quantum Oscillations without a Fermi Surface and the Anomalous de Haas–van Alphen Effect (2015)

Johannes Knolle and Nigel R. Cooper

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-09-29

Description: Author(s): Johannes Knolle and Nigel R. Cooper The Fermi surface of a metal is typically detected via quantum oscillations of its thermodynamic properties in response to a changing applied magnetic field. A microscopic model shows that these oscillations also occur in a band insulator, despite the absence of a Fermi surface. [Phys. Rev. Lett. 115, 146401] Published Mon Sep 28, 2015

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Size-Induced Depression of First-Order Transition Lines and Entropy Jump in Extremely Layered Nanocrystalline Vortex Matter (2015)

M. I. Dolz, Y. Fasano, N. R. Cejas Bolecek, H. Pastoriza, V. Mosser, M. Li, and M. Konczykowski

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-09-29

Description: Author(s): M. I. Dolz, Y. Fasano, N. R. Cejas Bolecek, H. Pastoriza, V. Mosser, M. Li, and M. Konczykowski We detect the persistence of the solidification and order-disorder first-order transition lines in the phase diagram of nanocrystalline Bi 2 Sr 2 CaCu 2 O 8 vortex matter down to a system size of less than one hundred vortices. The temperature location of the vortex solidification transition line is not al… [Phys. Rev. Lett. 115, 137003] Published Fri Sep 25, 2015

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Observation of a Helical Luttinger Liquid in InAs/GaSb Quantum Spin Hall Edges (2015)

Tingxin Li, Pengjie Wang, Hailong Fu, Lingjie Du, Kate A. Schreiber, Xiaoyang Mu, Xiaoxue Liu, Gerard Sullivan, Gábor A. Csáthy, Xi Lin, and Rui-Rui Du

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-09-29

Description: Author(s): Tingxin Li, Pengjie Wang, Hailong Fu, Lingjie Du, Kate A. Schreiber, Xiaoyang Mu, Xiaoxue Liu, Gerard Sullivan, Gábor A. Csáthy, Xi Lin, and Rui-Rui Du Strong electron-electron interactions are observed in one dimensional InAs/GaSb quantum spin Hall insulators. [Phys. Rev. Lett. 115, 136804] Published Fri Sep 25, 2015

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Many-Body Theory of Ultrafast Demagnetization and Angular Momentum Transfer in Ferromagnetic Transition Metals (2015)

W. Töws and G. M. Pastor

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-11-21

Description: Author(s): W. Töws and G. M. Pastor Exact calculated time evolutions in the framework of a many-electron model of itinerant magnetism provide new insights into the laser-induced ultrafast demagnetization observed in ferromagnetic (FM) transition metal thin films. The interplay between local spin-orbit interactions and interatomic hopp… [Phys. Rev. Lett. 115, 217204] Published Fri Nov 20, 2015

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Quantum Nonlinear Hall Effect Induced by Berry Curvature Dipole in Time-Reversal Invariant Materials (2015)

Inti Sodemann and Liang Fu

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-11-21

Description: Author(s): Inti Sodemann and Liang Fu It is well known that a nonvanishing Hall conductivity requires broken time-reversal symmetry. However, in this work, we demonstrate that Hall-like currents can occur in second-order response to external electric fields in a wide class of time-reversal invariant and inversion breaking materials, at … [Phys. Rev. Lett. 115, 216806] Published Fri Nov 20, 2015

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Magnetic Field Tuning and Quantum Interference in a Cooper Pair Splitter (2015)

G. Fülöp, F. Domínguez, S. d’Hollosy, A. Baumgartner, P. Makk, M. H. Madsen, V. A. Guzenko, J. Nygård, C. Schönenberger, A. Levy Yeyati, and S. Csonka

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-11-26

Description: Author(s): G. Fülöp, F. Domínguez, S. d’Hollosy, A. Baumgartner, P. Makk, M. H. Madsen, V. A. Guzenko, J. Nygård, C. Schönenberger, A. Levy Yeyati, and S. Csonka Cooper pair splitting (CPS) is a process in which the electrons of the naturally occurring spin-singlet pairs in a superconductor are spatially separated using two quantum dots. Here, we investigate the evolution of the conductance correlations in an InAs CPS device in the presence of an external ma… [Phys. Rev. Lett. 115, 227003] Published Wed Nov 25, 2015

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Spin-Current to Charge-Current Conversion and Magnetoresistance in a Hybrid Structure of Graphene and Yttrium Iron Garnet (2015)

J. B. S. Mendes, O. Alves Santos, L. M. Meireles, R. G. Lacerda, L. H. Vilela-Leão, F. L. A. Machado, R. L. Rodríguez-Suárez, A. Azevedo, and S. M. Rezende

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-11-26

Description: Author(s): J. B. S. Mendes, O. Alves Santos, L. M. Meireles, R. G. Lacerda, L. H. Vilela-Leão, F. L. A. Machado, R. L. Rodríguez-Suárez, A. Azevedo, and S. M. Rezende The use of graphene in spintronic devices depends, among other things, on its ability to convert a spin excitation into an electric charge signal, a phenomenon that requires a spin-orbit coupling (SOC). Here we report the observation of two effects that show the existence of SOC in large-area CVD gr… [Phys. Rev. Lett. 115, 226601] Published Wed Nov 25, 2015

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Leggett Modes and the Anderson-Higgs Mechanism in Superconductors without Inversion Symmetry (2015)

Nikolaj Bittner, Dietrich Einzel, Ludwig Klam, and Dirk Manske

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-11-26

Description: Author(s): Nikolaj Bittner, Dietrich Einzel, Ludwig Klam, and Dirk Manske We develop a microscopic and gauge-invariant theory for collective modes resulting from the phase of the superconducting order parameter in noncentrosymmetric superconductors. Considering various crystal symmetries, we derive the corresponding gauge mode ω G ( q ) and find, in particular, new Leggett mo… [Phys. Rev. Lett. 115, 227002] Published Tue Nov 24, 2015

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Suppression of Three-Dimensional Charge Density Wave Ordering via Thickness Control (2015)

Gideok Kim, Michael Neumann, Minu Kim, Manh Duc Le, Tae Dong Kang, and Tae Won Noh

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-11-26

Description: Author(s): Gideok Kim, Michael Neumann, Minu Kim, Manh Duc Le, Tae Dong Kang, and Tae Won Noh Barium bismuth oxide ( BaBiO 3 ) is the end member of two families of high- T c superconductors, i.e., BaPb 1 − x Bi x O 3 and Ba 1 − x K x BiO 3 . The undoped parent compound is an insulator, exhibiting a charge density wave that is strongly linked to a static breathing distortion in the oxygen sublattice of the perov… [Phys. Rev. Lett. 115, 226402] Published Tue Nov 24, 2015

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Interplay of Surface and Dirac Plasmons in Topological Insulators: The Case of Bi_{2} Se_{3} (2015)

A. Politano, V. M. Silkin, I. A. Nechaev, M. S. Vitiello, L. Viti, Z. S. Aliev, M. B. Babanly, G. Chiarello, P. M. Echenique, and E. V. Chulkov

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-11-19

Description: Author(s): A. Politano, V. M. Silkin, I. A. Nechaev, M. S. Vitiello, L. Viti, Z. S. Aliev, M. B. Babanly, G. Chiarello, P. M. Echenique, and E. V. Chulkov We have investigated plasmonic excitations at the surface of Bi 2 Se 3 ( 0001 ) via high-resolution electron energy loss spectroscopy. For low parallel momentum transfer q ∥ , the loss spectrum shows a distinctive feature peaked at 104 meV. This mode varies weakly with q ∥ . The behavior of its intensity as a… [Phys. Rev. Lett. 115, 216802] Published Wed Nov 18, 2015

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Self-Assembled Wigner Crystals as Mediators of Spin Currents and Quantum Information (2015)

Bobby Antonio, Abolfazl Bayat, Sanjeev Kumar, Michael Pepper, and Sougato Bose

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-11-21

Description: Author(s): Bobby Antonio, Abolfazl Bayat, Sanjeev Kumar, Michael Pepper, and Sougato Bose Technological applications of many-body structures that emerge in gated devices under minimal control are largely unexplored. Here we show how emergent Wigner crystals in a semiconductor quantum wire can facilitate a pivotal requirement for a scalable quantum computer, namely, transmitting quantum i… [Phys. Rev. Lett. 115, 216804] Published Fri Nov 20, 2015

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Topological Edge States with Zero Hall Conductivity in a Dimerized Hofstadter Model (2015)

Alexander Lau, Carmine Ortix, and Jeroen van den Brink

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-11-21

Description: Author(s): Alexander Lau, Carmine Ortix, and Jeroen van den Brink The Hofstadter model is a simple yet powerful Hamiltonian to study quantum Hall physics in a lattice system, manifesting its essential topological states. Lattice dimerization in the Hofstadter model opens an energy gap at half filling. Here we show that even if the ensuing insulator has a Chern num… [Phys. Rev. Lett. 115, 216805] Published Fri Nov 20, 2015

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Selective Amplification of the Primary Exciton in a MoS_{2} Monolayer (2015)

Hyun Seok Lee, Min Su Kim, Youngjo Jin, Gang Hee Han, Young Hee Lee, and Jeongyong Kim

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-11-26

Description: Author(s): Hyun Seok Lee, Min Su Kim, Youngjo Jin, Gang Hee Han, Young Hee Lee, and Jeongyong Kim Optoelectronics applications for transition-metal dichalcogenides are still limited by weak light absorption and their complex exciton modes are easily perturbed by varying excitation conditions because they are inherent in atomically thin layers. Here, we propose a method of selectively amplifying … [Phys. Rev. Lett. 115, 226801] Published Wed Nov 25, 2015

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Angular-Dependent Phase Factor of Shubnikov–de Haas Oscillations in the Dirac Semimetal Cd_{3} As_{2} (2015)

Z. J. Xiang, D. Zhao, Z. Jin, C. Shang, L. K. Ma, G. J. Ye, B. Lei, T. Wu, Z. C. Xia, and X. H. Chen

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-11-26

Description: Author(s): Z. J. Xiang, D. Zhao, Z. Jin, C. Shang, L. K. Ma, G. J. Ye, B. Lei, T. Wu, Z. C. Xia, and X. H. Chen We measure the magnetotransport properties of the three-dimensional Dirac semimetal Cd 3 As 2 single crystal under magnetic fields up to 36 T. Shubnikov–de Haas (SdH) oscillations are clearly resolved and the n = 1 Landau level is reached. A detailed analysis on the intercept of the Landau index plot rev… [Phys. Rev. Lett. 115, 226401] Published Tue Nov 24, 2015

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Minimal Model of Spin-Transfer Torque and Spin Pumping Caused by the Spin Hall Effect (2015)

Wei Chen, Manfred Sigrist, Jairo Sinova, and Dirk Manske

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-11-20

Description: Author(s): Wei Chen, Manfred Sigrist, Jairo Sinova, and Dirk Manske In the normal-metal–ferromagnetic-insulator bilayer (such as Pt / Y 3 Fe 5 O 12 ) and the normal-metal–ferromagnetic-metal–oxide trilayer (such as Pt / Co / AlO x ) where spin injection and ejection are achieved by the spin Hall effect in the normal metal, we propose a minimal model based on quantum tunneling of … [Phys. Rev. Lett. 115, 217203] Published Thu Nov 19, 2015

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Quantum Manipulation of Two-Electron Spin States in Isolated Double Quantum Dots (2015)

Benoit Bertrand, Hanno Flentje, Shintaro Takada, Michihisa Yamamoto, Seigo Tarucha, Arne Ludwig, Andreas D. Wieck, Christopher Bäuerle, and Tristan Meunier

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-29

Description: Author(s): Benoit Bertrand, Hanno Flentje, Shintaro Takada, Michihisa Yamamoto, Seigo Tarucha, Arne Ludwig, Andreas D. Wieck, Christopher Bäuerle, and Tristan Meunier We studied experimentally the dynamics of the exchange interaction between two antiparallel electron spins in an isolated double quantum dot where coupling to the electron reservoirs can be ignored. We demonstrate that the level of control of such a double dot is higher than in conventional double d… [Phys. Rev. Lett. 115, 096801] Published Fri Aug 28, 2015

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Candidate Quantum Spin Liquid in the Ce^{3+} Pyrochlore Stannate Ce_{2} Sn_{2} O_{7} (2015)

Romain Sibille, Elsa Lhotel, Vladimir Pomjakushin, Chris Baines, Tom Fennell, and Michel Kenzelmann

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-08-29

Description: Author(s): Romain Sibille, Elsa Lhotel, Vladimir Pomjakushin, Chris Baines, Tom Fennell, and Michel Kenzelmann We report the low-temperature magnetic properties of Ce 2 Sn 2 O 7 , a rare-earth pyrochlore. Our susceptibility and magnetization measurements show that due to the thermal isolation of a Kramers doublet ground state, Ce 2 Sn 2 O 7 has Ising-like magnetic moments of ∼ 1.18 μ B . The magnetic moments are confined… [Phys. Rev. Lett. 115, 097202] Published Thu Aug 27, 2015

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Effect of Structural Relaxation on the Electronic Structure of Graphene on Hexagonal Boron Nitride (2015)

G. J. Slotman, M. M. van Wijk, Pei-Liang Zhao, A. Fasolino, M. I. Katsnelson, and Shengjun Yuan

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-10-27

Description: Author(s): G. J. Slotman, M. M. van Wijk, Pei-Liang Zhao, A. Fasolino, M. I. Katsnelson, and Shengjun Yuan We performed calculations of electronic, optical, and transport properties of graphene on hexagonal boron nitride with realistic moiré patterns. The latter are produced by structural relaxation using a fully atomistic model. This relaxation turns out to be crucially important for electronic properti… [Phys. Rev. Lett. 115, 186801] Published Mon Oct 26, 2015

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Itinerant Ferromagnetism in the As 4p Conduction Band of Ba_{0.6}K_{0.4}Mn_{2}As_{2} Identified by X-Ray Magnetic Circular Dichroism (2015)

B. G. Ueland, Abhishek Pandey, Y. Lee, A. Sapkota, Y. Choi, D. Haskel, R. A. Rosenberg, J. C. Lang, B. N. Harmon, D. C. Johnston, A. Kreyssig, and A. I. Goldman

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-05-29

Description: Author(s): B. G. Ueland, Abhishek Pandey, Y. Lee, A. Sapkota, Y. Choi, D. Haskel, R. A. Rosenberg, J. C. Lang, B. N. Harmon, D. C. Johnston, A. Kreyssig, and A. I. Goldman X-ray magnetic circular dichroism (XMCD) measurements on single-crystal and powder samples of Ba 0.6 K 0.4 Mn 2 As 2 show that the ferromagnetism below T C ≈ 100 K arises in the As 4 p conduction band. No XMCD signal is observed at the Mn x-ray absorption edges. Below T C , however, a clear XMCD signal is found... [Phys. Rev. Lett. 114, 217001] Published Wed May 27, 2015

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Reentrant Superconductivity Driven by Quantum Tricritical Fluctuations in URhGe: Evidence from ^{59}Co NMR in URh_{0.9}Co_{0.1}Ge (2015)

Y. Tokunaga, D. Aoki, H. Mayaffre, S. Krämer, M.-H. Julien, C. Berthier, M. Horvatić, H. Sakai, S. Kambe, and S. Araki

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-05-29

Description: Author(s): Y. Tokunaga, D. Aoki, H. Mayaffre, S. Krämer, M.-H. Julien, C. Berthier, M. Horvatić, H. Sakai, S. Kambe, and S. Araki NMR measurements near the quantum tricritical point show that reentrance of superconductivity at high fields requires longitudinal fluctuations (parallel to the applied field). These experimental results will require revision of theoretical work, which to date has included only transverse fluctuations. [Phys. Rev. Lett. 114, 216401] Published Wed May 27, 2015

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Quantum Criticality of Hot Random Spin Chains (2015)

R. Vasseur, A. C. Potter, and S. A. Parameswaran

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-05-29

Description: Author(s): R. Vasseur, A. C. Potter, and S. A. Parameswaran We study the infinite-temperature properties of an infinite sequence of random quantum spin chains using a real-space renormalization group approach, and demonstrate that they exhibit nonergodic behavior at strong disorder. The analysis is conveniently implemented in terms of SU ( 2 ) k anyon chains tha... [Phys. Rev. Lett. 114, 217201] Published Wed May 27, 2015

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Interpretation of Scanning Tunneling Quasiparticle Interference and Impurity States in Cuprates (2015)

A. Kreisel, Peayush Choubey, T. Berlijn, W. Ku, B. M. Andersen, and P. J. Hirschfeld

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-05-29

Description: Author(s): A. Kreisel, Peayush Choubey, T. Berlijn, W. Ku, B. M. Andersen, and P. J. Hirschfeld We apply a recently developed method combining first principles based Wannier functions with solutions to the Bogoliubov–de Gennes equations to the problem of interpreting STM data in cuprate superconductors. We show that the observed images of Zn on the surface of Bi 2 Sr 2 CaCu 2 O 8 can only be understo... [Phys. Rev. Lett. 114, 217002] Published Wed May 27, 2015

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Anisotropic Stark Effect and Electric-Field Noise Suppression for Phosphorus Donor Qubits in Silicon (2015)

A. J. Sigillito, A. M. Tyryshkin, and S. A. Lyon

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-05-29

Description: Author(s): A. J. Sigillito, A. M. Tyryshkin, and S. A. Lyon We report the use of novel, capacitively terminated coplanar waveguide resonators to measure the quadratic Stark shift of phosphorus donor qubits in Si. We confirm that valley repopulation leads to an anisotropic spin-orbit Stark shift depending on electric and magnetic field orientations relative t... [Phys. Rev. Lett. 114, 217601] Published Wed May 27, 2015

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Magnetic Structure and Ordering of Multiferroic Hexagonal LuFeO_{3} (2015)

Steven M. Disseler, Julie A. Borchers, Charles M. Brooks, Julia A. Mundy, Jarrett A. Moyer, Daniel A. Hillsberry, Eric L. Thies, Dmitri A. Tenne, John Heron, Megan E. Holtz, James D. Clarkson, Gregory M. Stiehl, Peter Schiffer, David A. Muller, Darrell G. Schlom, and William D. Ratcliff

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-05-29

Description: Author(s): Steven M. Disseler, Julie A. Borchers, Charles M. Brooks, Julia A. Mundy, Jarrett A. Moyer, Daniel A. Hillsberry, Eric L. Thies, Dmitri A. Tenne, John Heron, Megan E. Holtz, James D. Clarkson, Gregory M. Stiehl, Peter Schiffer, David A. Muller, Darrell G. Schlom, and William D. Ratcliff We report on the magnetic structure and ordering of hexagonal LuFeO 3 films of variable thickness grown by molecular-beam epitaxy on YSZ (111) and Al 2 O 3 (0001) substrates. These crystalline films exhibit long-range structural uniformity dominated by the polar P 6 3 c m phase, which is responsible for the... [Phys. Rev. Lett. 114, 217602] Published Wed May 27, 2015

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One-Third Magnetization Plateau with a Preceding Novel Phase in Volborthite (2015)

H. Ishikawa, M. Yoshida, K. Nawa, M. Jeong, S. Krämer, M. Horvatić, C. Berthier, M. Takigawa, M. Akaki, A. Miyake, M. Tokunaga, K. Kindo, J. Yamaura, Y. Okamoto, and Z. Hiroi

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-06-02

Description: Author(s): H. Ishikawa, M. Yoshida, K. Nawa, M. Jeong, S. Krämer, M. Horvatić, C. Berthier, M. Takigawa, M. Akaki, A. Miyake, M. Tokunaga, K. Kindo, J. Yamaura, Y. Okamoto, and Z. Hiroi We have synthesized high-quality single crystals of volborthite, a seemingly distorted kagome antiferromagnet, and carried out high-field magnetization measurements up to 74 T and V 51 NMR measurements up to 30 T. An extremely wide 1 / 3 magnetization plateau appears above 28 T and continues over 74 T ... [Phys. Rev. Lett. 114, 227202] Published Mon Jun 01, 2015

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Collective Transport Properties of Driven Skyrmions with Random Disorder (2015)

C. Reichhardt, D. Ray, and C. J. Olson Reichhardt

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-05-29

Description: Author(s): C. Reichhardt, D. Ray, and C. J. Olson Reichhardt We use particle-based simulations to examine the static and driven collective phases of Skyrmions interacting with random quenched disorder. We show that nondissipative effects due to the Magnus term reduce the depinning threshold and strongly affect the Skyrmion motion and the nature of the dynamic... [Phys. Rev. Lett. 114, 217202] Published Wed May 27, 2015

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Critical Slowing Down of the Charge Carrier Dynamics at the Mott Metal-Insulator Transition (2015)

Benedikt Hartmann, David Zielke, Jana Polzin, Takahiko Sasaki, and Jens Müller

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-05-30

Description: Author(s): Benedikt Hartmann, David Zielke, Jana Polzin, Takahiko Sasaki, and Jens Müller We report on the dramatic slowing down of the charge carrier dynamics in a quasi-two-dimensional organic conductor, which can be reversibly tuned through the Mott metal-insulator transition (MIT). At the finite-temperature critical end point, we observe a divergent increase of the resistance fluctua... [Phys. Rev. Lett. 114, 216403] Published Fri May 29, 2015

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Multivariable Scaling for the Anomalous Hall Effect (2015)

Dazhi Hou, Gang Su, Yuan Tian, Xiaofeng Jin, Shengyuan A. Yang, and Qian Niu

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-05-30

Description: Author(s): Dazhi Hou, Gang Su, Yuan Tian, Xiaofeng Jin, Shengyuan A. Yang, and Qian Niu We derive a general scaling relation for the anomalous Hall effect in ferromagnetic metals involving multiple competing scattering mechanisms, described by a quadratic hypersurface in the space spanned by the partial resistivities. We also present experimental findings, which show strong deviation f... [Phys. Rev. Lett. 114, 217203] Published Fri May 29, 2015

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Observation of Anderson Localization in Ultrathin Films of Three-Dimensional Topological Insulators (2015)

Jian Liao, Yunbo Ou, Xiao Feng, Shuo Yang, Chaojing Lin, Wenmin Yang, Kehui Wu, Ke He, Xucun Ma, Qi-Kun Xue, and Yongqing Li

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-05-30

Description: Author(s): Jian Liao, Yunbo Ou, Xiao Feng, Shuo Yang, Chaojing Lin, Wenmin Yang, Kehui Wu, Ke He, Xucun Ma, Qi-Kun Xue, and Yongqing Li Anderson localization, the absence of diffusive transport in disordered systems, has been manifested as hopping transport in numerous electronic systems, whereas in recently discovered topological insulators it has not been directly observed. Here, we report experimental demonstration of a crossover... [Phys. Rev. Lett. 114, 216601] Published Thu May 28, 2015

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Chiral Spin Density Wave Order on the Frustrated Honeycomb and Bilayer Triangle Lattice Hubbard Model at Half-Filling (2015)

Kun Jiang, Yi Zhang, Sen Zhou, and Ziqiang Wang

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-05-30

Description: Author(s): Kun Jiang, Yi Zhang, Sen Zhou, and Ziqiang Wang We study the Hubbard model on the frustrated honeycomb lattice with nearest-neighbor hopping t 1 and second nearest-neighbor hopping t 2 , which is isomorphic to the bilayer triangle lattice, using the SU(2)-invariant slave boson theory. We show that the Coulomb interaction U induces antiferromagnetic ... [Phys. Rev. Lett. 114, 216402] Published Fri May 29, 2015

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Collective Nature of Spin Excitations in Superconducting Cuprates Probed by Resonant Inelastic X-Ray Scattering (2015)

M. Minola, G. Dellea, H. Gretarsson, Y. Y. Peng, Y. Lu, J. Porras, T. Loew, F. Yakhou, N. B. Brookes, Y. B. Huang, J. Pelliciari, T. Schmitt, G. Ghiringhelli, B. Keimer, L. Braicovich, and M. Le Tacon

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-05-30

Description: Author(s): M. Minola, G. Dellea, H. Gretarsson, Y. Y. Peng, Y. Lu, J. Porras, T. Loew, F. Yakhou, N. B. Brookes, Y. B. Huang, J. Pelliciari, T. Schmitt, G. Ghiringhelli, B. Keimer, L. Braicovich, and M. Le Tacon We used resonant inelastic x-ray scattering (RIXS) with and without analysis of the scattered photon polarization, to study dispersive spin excitations in the high temperature superconductor YBa 2 Cu 3 O 6 + x over a wide range of doping levels ( 0.1 ≤ x ≤ 1 ). The excitation profiles were carefully monitored as... [Phys. Rev. Lett. 114, 217003] Published Thu May 28, 2015

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Wess-Zumino-Witten Terms in Graphene Landau Levels (2015)

Junhyun Lee and Subir Sachdev

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-06-02

Description: Author(s): Junhyun Lee and Subir Sachdev An effective field theory describing the quantum critical behavior of magnetic ordering in monolayer and bilayer graphene has a Wess-Zumino-Witten term, similar to that found in the chiral Lagrangian for QCD. [Phys. Rev. Lett. 114, 226801] Published Mon Jun 01, 2015

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Spin Pumping in Electrodynamically Coupled Magnon-Photon Systems (2015)

Lihui Bai, M. Harder, Y. P. Chen, X. Fan, J. Q. Xiao, and C.-M. Hu

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-06-02

Description: Author(s): Lihui Bai, M. Harder, Y. P. Chen, X. Fan, J. Q. Xiao, and C.-M. Hu Excitations in a magnet coupled to a microwave cavity can be detected electrically, providing a new way to study magnets in the quantum regime. [Phys. Rev. Lett. 114, 227201] Published Mon Jun 01, 2015

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Non-Fermi-Liquid Behavior and Anomalous Suppression of Landau Damping in Layered Metals Close to Ferromagnetism (2015)

Sam P. Ridgway and Chris A. Hooley

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-06-09

Description: Author(s): Sam P. Ridgway and Chris A. Hooley We analyze the low-energy physics of nearly ferromagnetic metals in two spatial dimensions using the functional renormalization group technique. We find a new low-energy fixed point, at which the fermionic (electronlike) excitations are non-Fermi-liquid ( z f = 13 / 10 ) and the magnetic fluctuations exhib... [Phys. Rev. Lett. 114, 226404] Published Fri Jun 05, 2015

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Remarkably Robust and Correlated Coherence and Antiferromagnetism in (Ce_{1−x}La_{x})Cu_{2}Ge_{2} (2015)

H. Hodovanets, S. L. Bud’ko, W. E. Straszheim, V. Taufour, E. D. Mun, H. Kim, R. Flint, and P. C. Canfield

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-06-09

Description: Author(s): H. Hodovanets, S. L. Bud’ko, W. E. Straszheim, V. Taufour, E. D. Mun, H. Kim, R. Flint, and P. C. Canfield We present magnetic susceptibility, resistivity, specific heat, and thermoelectric power measurements on (Ce1−xLax)Cu2Ge2 single crystals ( 0≤x≤1 ). With La substitution, the antiferromagnetic temperature TN is suppressed in an almost linear fashion and moves below 0.36 K, the base temperature of our ... [Phys. Rev. Lett. 114, 236601] Published Mon Jun 08, 2015

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Observation of a Devil’s Staircase in the Novel Spin-Valve System SrCo_{6}O_{11} (2015)

T. Matsuda, S. Partzsch, T. Tsuyama, E. Schierle, E. Weschke, J. Geck, T. Saito, S. Ishiwata, Y. Tokura, and H. Wadati

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-06-12

Description: Author(s): T. Matsuda, S. Partzsch, T. Tsuyama, E. Schierle, E. Weschke, J. Geck, T. Saito, S. Ishiwata, Y. Tokura, and H. Wadati Using resonant soft-x-ray scattering as a function of both temperature and magnetic field, we reveal a large number of almost degenerate magnetic orders in SrCo 6 O 11 . The Ising-like spins in this frustrated material in fact exhibit a so-called magnetic devil’s staircase. It is demonstrated how a magn... [Phys. Rev. Lett. 114, 236403] Published Thu Jun 11, 2015

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Splitting of the Fermi Contour of Quasi-2D Electrons in Parallel Magnetic Fields (2015)

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

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-06-12

Description: Author(s): M. A. Mueed, D. Kamburov, M. Shayegan, L. N. Pfeiffer, K. W. West, K. W. Baldwin, and R. Winkler The two-dimensional Fermi surface for electrons confined in gallium arsenide quantum wells evolves, distorts and eventually splits in two from the presence of a strong in-plane magnetic field. [Phys. Rev. Lett. 114, 236404] Published Thu Jun 11, 2015

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Pauli-Heisenberg Oscillations in Electron Quantum Transport (2015)

Karl Thibault, Julien Gabelli, Christian Lupien, and Bertrand Reulet

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-06-12

Description: Author(s): Karl Thibault, Julien Gabelli, Christian Lupien, and Bertrand Reulet Temporal correlations between electrons reveal that electrons crossing a conductor at low temperature cross it at a regular pace h / e V with a jitter h / k B T , thus providing a simple picture of why and how current fluctuates. [Phys. Rev. Lett. 114, 236604] Published Thu Jun 11, 2015

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Position-Momentum Duality and Fractional Quantum Hall Effect in Chern Insulators (2015)

Martin Claassen, Ching Hua Lee, Ronny Thomale, Xiao-Liang Qi, and Thomas P. Devereaux

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-06-12

Description: Author(s): Martin Claassen, Ching Hua Lee, Ronny Thomale, Xiao-Liang Qi, and Thomas P. Devereaux A first-quantized description of fractional Chern insulators is developed using the approach commonly employed in the quantum Hall effect. [Phys. Rev. Lett. 114, 236802] Published Thu Jun 11, 2015

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Emergent Spacetime Supersymmetry in 3D Weyl Semimetals and 2D Dirac Semimetals (2015)

Shao-Kai Jian, Yi-Fan Jiang, and Hong Yao

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-06-12

Description: Author(s): Shao-Kai Jian, Yi-Fan Jiang, and Hong Yao Renormalization group analysis demonstrates that space-time supersymmetry emerges at pair density wave transitions in 3D Weyl and 2D Dirac semimetals. [Phys. Rev. Lett. 114, 237001] Published Thu Jun 11, 2015

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Optical Realization of Double-Continuum Fano Interference and Coherent Control in Plasmonic Metasurfaces (2015)

Nihal Arju, Tzuhsuan Ma, Alexander Khanikaev, David Purtseladze, and Gennady Shvets

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-06-12

Description: Author(s): Nihal Arju, Tzuhsuan Ma, Alexander Khanikaev, David Purtseladze, and Gennady Shvets Classical realization of a ubiquitous quantum mechanical phenomenon of double-continuum Fano interference using metasurfaces is experimentally demonstrated by engineering the near-field interaction between two bright and one dark plasmonic modes. The competition between the bright modes, one of them... [Phys. Rev. Lett. 114, 237403] Published Thu Jun 11, 2015

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Topological Superconductivity and High Chern Numbers in 2D Ferromagnetic Shiba Lattices (2015)

Joel Röntynen and Teemu Ojanen

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-06-13

Description: Author(s): Joel Röntynen and Teemu Ojanen Inspired by the recent experimental observation of topological superconductivity in ferromagnetic chains, we consider a dilute 2D lattice of magnetic atoms deposited on top of a superconducting surface with a Rashba spin-orbit coupling. We show that the studied system supports a generalization of p x ... [Phys. Rev. Lett. 114, 236803] Published Fri Jun 12, 2015

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Geometric Resonance of Composite Fermions Near the ν=1/2 Fractional Quantum Hall State (2015)

M. A. Mueed, D. Kamburov, S. Hasdemir, 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: 2015-06-13

Description: Author(s): M. A. Mueed, D. Kamburov, S. Hasdemir, M. Shayegan, L. N. Pfeiffer, K. W. West, and K. W. Baldwin We observe geometric resonance features of composite fermions on the flanks of the even-denominator ν = 1 / 2 fractional quantum Hall state in high-mobility two-dimensional electron and hole systems confined to wide GaAs quantum wells and subjected to a weak, strain-induced, unidirectional periodic pote... [Phys. Rev. Lett. 114, 236406] Published Fri Jun 12, 2015

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Electrical and Thermal Transport in Inhomogeneous Luttinger Liquids (2015)

Wade De; Gottardi and K. A. Matveev

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-06-13

Description: Author(s): Wade DeGottardi and K. A. Matveev We study the transport properties of long quantum wires by generalizing the Luttinger liquid approach to allow for the finite lifetime of the bosonic excitations. Our theory accounts for long-range disorder and strong electron interactions, both of which are common features of experiments with quant... [Phys. Rev. Lett. 114, 236405] Published Fri Jun 12, 2015

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Spin Chirality Tuning and Topological Semimetals in Strained HgTe_{x}S_{1−x} (2015)

Tomáš Rauch, Steven Achilles, Jürgen Henk, and Ingrid Mertig

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-06-13

Description: Author(s): Tomáš Rauch, Steven Achilles, Jürgen Henk, and Ingrid Mertig By means of detailed electronic structure calculations, we show that strained HgTe x S 1 − x alloys show a surprisingly rich topological phase diagram. In the strong topological insulator phase, the spin chirality of the topological nontrivial surface states can be reversed by adjusting the alloy concent... [Phys. Rev. Lett. 114, 236805] Published Fri Jun 12, 2015

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Impurity-Induced Bound States in Superconductors with Spin-Orbit Coupling (2015)

Younghyun Kim, Junhua Zhang, E. Rossi, and Roman M. Lutchyn

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2015-06-13

Description: Author(s): Younghyun Kim, Junhua Zhang, E. Rossi, and Roman M. Lutchyn We study the effect of strong spin-orbit coupling (SOC) on bound states induced by impurities in superconductors. The presence of SOC breaks the SU(2)-spin symmetry and causes the superconducting order parameter to have generically both singlet ( s -wave) and triplet ( p -wave) components. We find that ... [Phys. Rev. Lett. 114, 236804] Published Fri Jun 12, 2015

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Momentum-Resolved Electronic Structure of the High-T_{c} Superconductor Parent Compound BaBiO_{3} (2016)

N. C. Plumb, D. J. Gawryluk, Y. Wang, Z. Ristić, J. Park, B. Q. Lv, Z. Wang, C. E. Matt, N. Xu, T. Shang, K. Conder, J. Mesot, S. Johnston, M. Shi, and M. Radović

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2016-07-13

Description: Author(s): N. C. Plumb, D. J. Gawryluk, Y. Wang, Z. Ristić, J. Park, B. Q. Lv, Z. Wang, C. E. Matt, N. Xu, T. Shang, K. Conder, J. Mesot, S. Johnston, M. Shi, and M. Radović We investigate the band structure of BaBiO 3 , an insulating parent compound of doped high- T c superconductors, using in situ angle-resolved photoemission spectroscopy on thin films. The data compare favorably overall with density functional theory calculations within the local density approximation, d… [Phys. Rev. Lett. 117, 037002] Published Tue Jul 12, 2016

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Snell’s Law for Spin Waves (2016)

J. Stigloher, M. Decker, H. S. Körner, K. Tanabe, T. Moriyama, T. Taniguchi, H. Hata, M. Madami, G. Gubbiotti, K. Kobayashi, T. Ono, and C. H. Back

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2016-07-13

Description: Author(s): J. Stigloher, M. Decker, H. S. Körner, K. Tanabe, T. Moriyama, T. Taniguchi, H. Hata, M. Madami, G. Gubbiotti, K. Kobayashi, T. Ono, and C. H. Back Researchers have verified experimentally that the reflection and refraction of spin waves at an interface follow a Snell’s-like law. [Phys. Rev. Lett. 117, 037204] Published Tue Jul 12, 2016

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High-Precision Measurement of the Dzyaloshinsky-Moriya Interaction between Two Rare-Earth Ions in a Solid (2016)

Cyril Laplane, Emmanuel Zambrini Cruzeiro, Florian Fröwis, Philippe Goldner, and Mikael Afzelius

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2016-07-13

Description: Author(s): Cyril Laplane, Emmanuel Zambrini Cruzeiro, Florian Fröwis, Philippe Goldner, and Mikael Afzelius Electron spin resonance measurements on ND 3 + doped single crystals of YVO 4 directly reveal the pairwise anti-symmetric exchange interaction known as the Dzyaloshinsky-Moriya interaction. [Phys. Rev. Lett. 117, 037203] Published Tue Jul 12, 2016

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Interface-Driven Ferromagnetism within the Quantum Wells of a Rare Earth Titanate Superlattice (2016)

R. F. Need, B. J. Isaac, B. J. Kirby, J. A. Borchers, S. Stemmer, and Stephen D. Wilson

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2016-07-13

Description: Author(s): R. F. Need, B. J. Isaac, B. J. Kirby, J. A. Borchers, S. Stemmer, and Stephen D. Wilson Here we present polarized neutron reflectometry measurements exploring thin film heterostructures composed of a strongly correlated Mott state, GdTiO 3 , embedded with SrTiO 3 quantum wells. Our results reveal that the net ferromagnetism inherent to the Mott GdTiO 3 matrix propagates into the nominally … [Phys. Rev. Lett. 117, 037205] Published Tue Jul 12, 2016

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Thermopower and Entropy: Lessons from Sr_{2} RuO_{4} (2016)

Jernej Mravlje and Antoine Georges

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2016-07-13

Description: Author(s): Jernej Mravlje and Antoine Georges We calculate the in-plane Seebeck coefficient of Sr 2 RuO 4 within a framework combining electronic structure and dynamical mean-field theory. We show that its temperature dependence can be interpreted using entropic considerations based on the Kelvin formula and that it provides a meaningful probe of … [Phys. Rev. Lett. 117, 036401] Published Tue Jul 12, 2016

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