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Nearly Flatbands with Nontrivial Topology (2011)

Kai Sun, Zhengcheng Gu, Hosho Katsura, and S. Das Sarma

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-07

Description: Author(s): Kai Sun, Zhengcheng Gu, Hosho Katsura, and S. Das Sarma We report the theoretical discovery of a class of 2D tight-binding models containing nearly flatbands with nonzero Chern numbers. In contrast with previous studies, where nonlocal hoppings are usually required, the Hamiltonians of our models only require short-range hopping and have the potential to... [Phys. Rev. Lett. 106, 236803] Published Mon Jun 06, 2011

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Weakly Coupled Pfaffian as a Type I Quantum Hall Liquid (2011)

S. A. Parameswaran, S. A. Kivelson, S. L. Sondhi, and B. Z. Spivak

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-07

Description: Author(s): S. A. Parameswaran, S. A. Kivelson, S. L. Sondhi, and B. Z. Spivak The Pfaffian phase in the proximity of a half-filled Landau level is understood to be a p + i p superconductor of composite fermions. We consider the properties of this paired quantum Hall phase when the pairing energy is small, i.e., in the weak-coupling, BCS limit, where the coherence length is much ... [Phys. Rev. Lett. 106, 236801] Published Mon Jun 06, 2011

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Two-Dimensional Magnetic and Superconducting Phases in Metal-Insulator La_{2-x}Sr_{x}CuO_{4} Superlattices Measured by Muon-Spin Rotation (2011)

A. Suter, E. Morenzoni, T. Prokscha, B. M. Wojek, H. Luetkens, G. Nieuwenhuys, A. Gozar, G. Logvenov, and I. Božović

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-09

Description: Author(s): A. Suter, E. Morenzoni, T. Prokscha, B. M. Wojek, H. Luetkens, G. Nieuwenhuys, A. Gozar, G. Logvenov, and I. Božović We show, by means of low-energy muon-spin rotation measurements, that few-unit-cells thick La 2 CuO 4 layers synthesized digitally by molecular beam epitaxy are antiferromagnetically ordered. Below a thickness of about 5 CuO 2 layers the long-range ordered state breaks down, and a magnetic state appears... [Phys. Rev. Lett. 106, 237003] Published Wed Jun 08, 2011

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Pressure-Stabilized Sodium Polyhydrides: NaH_{n} (n〉1) (2011)

Pio Baettig and Eva Zurek

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-09

Description: Author(s): Pio Baettig and Eva Zurek Computations on NaH n , n =6–12 , show that NaH 9 is stable by P =25 GPa . Cmc2 1 -NaH 9 containing both H 2 and H - units is metallic at P 〉250 GPa . Other phases with only H 2 units metallize at lower pressures as a result of the partial filling of the H 2 σ u * bands by the Na 3 s electrons. Pressure induced o... [Phys. Rev. Lett. 106, 237002] Published Wed Jun 08, 2011

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Conductance of a Helical Edge Liquid Coupled to a Magnetic Impurity (2011)

Yoichi Tanaka, A. Furusaki, and K. A. Matveev

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-10

Description: Author(s): Yoichi Tanaka, A. Furusaki, and K. A. Matveev Transport in an ideal two-dimensional quantum spin Hall device is dominated by the counterpropagating edge states of electrons with opposite spins, giving the universal value of the conductance, 2 e 2 / h . We study the effect on the conductance of a magnetic impurity, which can backscatter an electron f... [Phys. Rev. Lett. 106, 236402] Published Thu Jun 09, 2011

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Magnetostructural Transitions in a Frustrated Magnet at High Fields (2011)

V. Tsurkan, S. Zherlitsyn, V. Felea, S. Yasin, Yu. Skourski, J. Deisenhofer, H.-A. Krug von Nidda, P. Lemmens, J. Wosnitza, and A. Loidl

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-17

Description: Author(s): V. Tsurkan, S. Zherlitsyn, V. Felea, S. Yasin, Yu. Skourski, J. Deisenhofer, H.-A. Krug von Nidda, P. Lemmens, J. Wosnitza, and A. Loidl Ultrasound and magnetization studies of bond-frustrated ZnCr 2 S 4 spinel are performed in static magnetic fields up to 18 T and in pulsed fields up to 62 T. At temperatures below the antiferromagnetic transition at T N 1 ≈14 K , the sound velocity as a function of the magnetic field reveals a sequence of... [Phys. Rev. Lett. 106, 247202] Published Thu Jun 16, 2011

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Theory of High-Temperature Multiferroicity in Cupric Oxide (2011)

Pierre Tolédano, Naëmi Leo, Dmitry D. Khalyavin, Laurent C. Chapon, Tim Hoffmann, Dennis Meier, and Manfred Fiebig

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-21

Description: Author(s): Pierre Tolédano, Naëmi Leo, Dmitry D. Khalyavin, Laurent C. Chapon, Tim Hoffmann, Dennis Meier, and Manfred Fiebig The incommensurate-commensurate phases reported in cupric oxide below 230 K are shown theoretically to realize an inverted sequence of symmetry-breaking mechanisms with respect to the usual sequence occurring in low-temperature multiferroic compounds. The sequence inversion results from a strong tri... [Phys. Rev. Lett. 106, 257601] Published Mon Jun 20, 2011

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Spin-Polarized Scanning-Tunneling Probe for Helical Luttinger Liquids (2011)

Sourin Das and Sumathi Rao

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-11

Description: Author(s): Sourin Das and Sumathi Rao We propose a three-terminal spin-polarized STM setup for probing the helical nature of the Luttinger liquid edge state that appears in the quantum spin Hall system. We show that the three-terminal tunneling conductance depends on the angle ( θ ) between the magnetization direction of the tip and the l... [Phys. Rev. Lett. 106, 236403] Published Fri Jun 10, 2011

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BiFeO_{3} Films under Tensile Epitaxial Strain from First Principles (2011)

B. Dupé, S. Prosandeev, G. Geneste, B. Dkhil, and L. Bellaiche

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-11

Description: Author(s): B. Dupé, S. Prosandeev, G. Geneste, B. Dkhil, and L. Bellaiche Density-functional calculations are performed to predict structural and magnetic properties of (001) BiFeO 3 films under tensile epitaxial strain. These films remain monoclinic ( C c space group) for misfit strains between 0% and ≈8% , with the polarization, tilt axis and magnetization all rotating when... [Phys. Rev. Lett. 106, 237601] Published Fri Jun 10, 2011

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Anomalous Spin-Resolved Point-Contact Transmission of Holes due to Cubic Rashba Spin-Orbit Coupling (2011)

Stefano Chesi, Gabriele F. Giuliani, L. P. Rokhinson, L. N. Pfeiffer, and K. W. West

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-11

Description: Author(s): Stefano Chesi, Gabriele F. Giuliani, L. P. Rokhinson, L. N. Pfeiffer, and K. W. West Evidence is presented for the finite wave vector crossing of the two lowest one-dimensional spin-split subbands in quantum point contacts fabricated from two-dimensional hole gases with strong spin-orbit interaction. This phenomenon offers an elegant explanation for the anomalous sign of the spin po... [Phys. Rev. Lett. 106, 236601] Published Fri Jun 10, 2011

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Preformed Excitonic Liquid Route to a Charge Density Wave in 2H-TaSe_{2} (2011)

A. Taraphder, S. Koley, N. S. Vidhyadhiraja, and M. S. Laad

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-11

Description: Author(s): A. Taraphder, S. Koley, N. S. Vidhyadhiraja, and M. S. Laad Recent experiments on 2H-TaSe 2 contradict the long-held view of the charge density wave arising from a nested band structure. An intrinsically strong coupling view, involving a charge density wave state arising as a Bose condensation of preformed excitons emerges as an attractive, albeit scantily in... [Phys. Rev. Lett. 106, 236405] Published Fri Jun 10, 2011

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Exciton Transport and Andreev Reflection in a Bilayer Quantum Hall System (2011)

A. D. K. Finck, J. P. Eisenstein, L. N. Pfeiffer, and K. W. West

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-11

Description: Author(s): A. D. K. Finck, J. P. Eisenstein, L. N. Pfeiffer, and K. W. West We demonstrate that counterflowing electrical currents can move through the bulk of the excitonic quantized Hall phase found in bilayer two-dimensional electron systems (2DES) even as charged excitations cannot. These counterflowing currents are transported by neutral excitons which are emitted and ... [Phys. Rev. Lett. 106, 236807] Published Fri Jun 10, 2011

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Electronic Structure via Potential Functional Approximations (2011)

Attila Cangi, Donghyung Lee, Peter Elliott, Kieron Burke, and E. K. U. Gross

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-11

Description: Author(s): Attila Cangi, Donghyung Lee, Peter Elliott, Kieron Burke, and E. K. U. Gross The universal functional of Hohenberg-Kohn is given as a coupling-constant integral over the density as a functional of the potential. Conditions are derived under which potential -functional approximations are variational. Construction via this method and imposition of these conditions are shown to ... [Phys. Rev. Lett. 106, 236404] Published Fri Jun 10, 2011

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Anomalous Meissner Effect in a Normal-Metal–Superconductor Junction with a Spin-Active Interface (2011)

Takehito Yokoyama, Yukio Tanaka, and Naoto Nagaosa

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-14

Description: Author(s): Takehito Yokoyama, Yukio Tanaka, and Naoto Nagaosa We investigate Meissner effect in normal-metal–superconductor junctions where the interface is spin active. We find that orbital magnetic susceptibility of the normal metal shows highly nontrivial behavior. In particular, the magnetic susceptibility depends on the temperature in an oscillatory fashi... [Phys. Rev. Lett. 106, 246601] Published Mon Jun 13, 2011

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Measurement of Electron-Hole Friction in an n-Doped GaAs/AlGaAs Quantum Well Using Optical Transient Grating Spectroscopy (2011)

Luyi Yang, J. D. Koralek, J. Orenstein, D. R. Tibbetts, J. L. Reno, and M. P. Lilly

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-14

Description: Author(s): Luyi Yang, J. D. Koralek, J. Orenstein, D. R. Tibbetts, J. L. Reno, and M. P. Lilly We use phase-resolved transient grating spectroscopy to measure the drift and diffusion of electron-hole density waves in a semiconductor quantum well. The unique aspects of this optical probe allow us to determine the frictional force between a two-dimensional Fermi liquid of electrons and a dilute... [Phys. Rev. Lett. 106, 247401] Published Mon Jun 13, 2011

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Magnetic Bond-Order Potential for Iron (2011)

M. Mrovec, D. Nguyen-Manh, C. Elsässer, and P. Gumbsch

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-15

Description: Author(s): M. Mrovec, D. Nguyen-Manh, C. Elsässer, and P. Gumbsch We present a magnetic bond-order potential (BOP) that is able to provide a correct description of both directional covalent bonds and magnetic interactions in iron. This potential, based on the tight binding approximation and the Stoner model of itinerant magnetism, forms a direct bridge between the... [Phys. Rev. Lett. 106, 246402] Published Tue Jun 14, 2011

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Electron Localization in Defective Ceria Films: A Study with Scanning-Tunneling Microscopy and Density-Functional Theory (2011)

Jan-Frederik Jerratsch, Xiang Shao, Niklas Nilius, Hans-Joachim Freund, Cristina Popa, M. Veronica Ganduglia-Pirovano, Asbjörn M. Burow, and Joachim Sauer

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-15

Description: Author(s): Jan-Frederik Jerratsch, Xiang Shao, Niklas Nilius, Hans-Joachim Freund, Cristina Popa, M. Veronica Ganduglia-Pirovano, Asbjörn M. Burow, and Joachim Sauer Scanning-tunneling microscopy and density-functional theory have been employed to identify the spatial correlation between an oxygen vacancy and the associated Ce 3+ ion pair in a defective CeO 2 (111) film. The two Ce 3+ ions can occupy different cationic shells around the vacancy. The resulting variat... [Phys. Rev. Lett. 106, 246801] Published Tue Jun 14, 2011

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Electronic Structure of the Topological Insulator Bi_{2}Se_{3} Using Angle-Resolved Photoemission Spectroscopy: Evidence for a Nearly Full Surface Spin Polarization (2011)

Z.-H. Pan, E. Vescovo, A. V. Fedorov, D. Gardner, Y. S. Lee, S. Chu, G. D. Gu, and T. Valla

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-23

Description: Author(s): Z.-H. Pan, E. Vescovo, A. V. Fedorov, D. Gardner, Y. S. Lee, S. Chu, G. D. Gu, and T. Valla We performed high-resolution spin- and angle-resolved photoemission spectroscopy studies of the electronic structure and the spin texture on the surface of Bi 2 Se 3 , a model TI. By tuning the photon energy, we found that the topological surface state is well separated from the bulk states in the vicin... [Phys. Rev. Lett. 106, 257004] Published Wed Jun 22, 2011

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Localization Properties of Random-Mass Dirac Fermions from Real-Space Renormalization Group (2011)

V. V. Mkhitaryan and M. E. Raikh

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-23

Description: Author(s): V. V. Mkhitaryan and M. E. Raikh Localization properties of random-mass Dirac fermions for a realization of mass disorder, commonly referred to as the Cho-Fisher model, are studied on the D -class chiral network. We show that a simple renormalization group (RG) description captures accurately a rich phase diagram: thermal metal and ... [Phys. Rev. Lett. 106, 256803] Published Wed Jun 22, 2011

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Hydrodynamic Description of Transport in Strongly Correlated Electron Systems (2011)

A. V. Andreev, Steven A. Kivelson, and B. Spivak

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-25

Description: Author(s): A. V. Andreev, Steven A. Kivelson, and B. Spivak We develop a hydrodynamic description of the resistivity and magnetoresistance of an electron liquid in a smooth disorder potential. This approach is valid when the electron-electron scattering length is sufficiently short. In a broad range of temperatures, the dissipation is dominated by heat fluxe... [Phys. Rev. Lett. 106, 256804] Published Fri Jun 24, 2011

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Production of Nonlocal Quartets and Phase-Sensitive Entanglement in a Superconducting Beam Splitter (2011)

Axel Freyn, Benoit Douçot, Denis Feinberg, and Régis Mélin

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-25

Description: Author(s): Axel Freyn, Benoit Douçot, Denis Feinberg, and Régis Mélin Three BCS superconductors S a , S b , and S and two short normal regions N a and N b in a three-terminal S a N a S N b S b setup provide a source of nonlocal quartets spatially separated as two correlated pairs in S a and S b , if the distance between the interfaces N a S and S N b is comparable to the coherence length ... [Phys. Rev. Lett. 106, 257005] Published Fri Jun 24, 2011

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Neutron Laue Diffraction Study on the Magnetic Phase Diagram of Multiferroic MnWO_{4} under Pulsed High Magnetic Fields (2011)

H. Nojiri, S. Yoshii, M. Yasui, K. Okada, M. Matsuda, J. -S. Jung, T. Kimura, L. Santodonato, G. E. Granroth, K. A. Ross, J. P. Carlo, and B. D. Gaulin

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-09

Description: Author(s): H. Nojiri, S. Yoshii, M. Yasui, K. Okada, M. Matsuda, J. -S. Jung, T. Kimura, L. Santodonato, G. E. Granroth, K. A. Ross, J. P. Carlo, and B. D. Gaulin We have combined time-of-flight neutron Laue diffraction and pulsed high magnetic fields at the Spallation Neutron Source to study the phase diagram of the multiferroic material MnWO 4 . The control of the field-pulse timing enabled an exploration of magnetic Bragg scattering through the time dependen... [Phys. Rev. Lett. 106, 237202] Published Wed Jun 08, 2011

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Direct Observation of Local Potassium Variation and Its Correlation to Electronic Inhomogeneity in (Ba_{1-x}K_{x})Fe_{2}As_{2} Pnictide (2011)

W. K. Yeoh, B. Gault, X. Y. Cui, C. Zhu, M. P. Moody, L. Li, R. K. Zheng, W. X Li, X. L. Wang, S. X. Dou, G. L. Sun, C. T. Lin, and S. P. Ringer

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-16

Description: Author(s): W. K. Yeoh, B. Gault, X. Y. Cui, C. Zhu, M. P. Moody, L. Li, R. K. Zheng, W. X Li, X. L. Wang, S. X. Dou, G. L. Sun, C. T. Lin, and S. P. Ringer Local fluctuations in the distribution of dopant atoms are thought to cause the nanoscale electronic disorder or phase separation in pnictide superconductors. Atom probe tomography has enabled the first direct observations of dopant species clustering in a K-doped 122-phase pnictide. First-principle... [Phys. Rev. Lett. 106, 247002] Published Wed Jun 15, 2011

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Iron Under Pressure: “Kohn Tweezers” and Remnant Magnetism (2011)

A. Monza, A. Meffre, F. Baudelet, J.-P. Rueff, M. d’Astuto, P. Munsch, S. Huotari, S. Lachaize, B. Chaudret, and Abhay Shukla

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-16

Description: Author(s): A. Monza, A. Meffre, F. Baudelet, J.-P. Rueff, M. d’Astuto, P. Munsch, S. Huotari, S. Lachaize, B. Chaudret, and Abhay Shukla In this work we investigate the magnetic and structural properties of bulk Fe and Fe nanoparticles under pressure with x-ray absorption and emission spectroscopies providing answers to two fundamental questions: (a) the chicken-or-egg problem for the magnetic and structural transitions and (b) magne... [Phys. Rev. Lett. 106, 247201] Published Wed Jun 15, 2011

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Coexistence of Bulk Superconductivity and Charge Density Wave in Cu_{x}ZrTe_{3} (2011)

Xiangde Zhu, Hechang Lei, and C. Petrovic

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-16

Description: Author(s): Xiangde Zhu, Hechang Lei, and C. Petrovic We report the coexistence of bulk superconductivity with T c =3.8 K and charge density wave (CDW) in Cu intercalated quasi-two-dimensional crystals of ZrTe 3 . The Cu intercalation results in the expansion of the unit cell orthogonal to the Zr-Zr metal chains and partial filling of CDW energy gap. We p... [Phys. Rev. Lett. 106, 246404] Published Wed Jun 15, 2011

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Nernst Response of the Landau Tubes in Graphite across the Quantum Limit (2011)

Benoît Fauqué, Zengwei Zhu, Tim Murphy, and Kamran Behnia

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-18

Description: Author(s): Benoît Fauqué, Zengwei Zhu, Tim Murphy, and Kamran Behnia We report on a study of the Nernst effect in graphite extended up to 45 T. The Nernst response sharply peaks when a Landau tube is squeezed inside the thermally fuzzy Fermi surface and presents a temperature-independent fixed point when the tube flattens to a single ring. Beyond the quantum limit, t... [Phys. Rev. Lett. 106, 246405] Published Fri Jun 17, 2011

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Incommensurate Spin-Density Wave Order in Electron-Doped BaFe_{2}As_{2} Superconductors (2011)

D. K. Pratt, M. G. Kim, A. Kreyssig, Y. B. Lee, G. S. Tucker, A. Thaler, W. Tian, J. L. Zarestky, S. L. Bud’ko, P. C. Canfield, B. N. Harmon, A. I. Goldman, and R. J. McQueeney

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-21

Description: Author(s): D. K. Pratt, M. G. Kim, A. Kreyssig, Y. B. Lee, G. S. Tucker, A. Thaler, W. Tian, J. L. Zarestky, S. L. Bud’ko, P. C. Canfield, B. N. Harmon, A. I. Goldman, and R. J. McQueeney Neutron diffraction studies of Ba(Fe 1-x Co x ) 2 As 2 reveal that commensurate antiferromagnetic order gives way to incommensurate magnetic order for Co compositions between 0.056〈 x 〈0.06 . The incommensurability has the form of a small transverse splitting (0, ± ϵ , 0) from the commensurate antiferroma... [Phys. Rev. Lett. 106, 257001] Published Mon Jun 20, 2011

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Thermally Limited Current Carrying Ability of Graphene Nanoribbons (2011)

Albert D. Liao, Justin Z. Wu, Xinran Wang, Kristof Tahy, Debdeep Jena, Hongjie Dai, and Eric Pop

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-21

Description: Author(s): Albert D. Liao, Justin Z. Wu, Xinran Wang, Kristof Tahy, Debdeep Jena, Hongjie Dai, and Eric Pop We investigate high-field transport in graphene nanoribbons (GNRs) on SiO 2 , up to breakdown. The maximum current density is limited by self-heating, but can reach 〉3 mA/ μ m for GNRs ∼15 nm wide. Comparison with larger, micron-sized graphene devices reveals that narrow GNRs benefit from 3D heat s... [Phys. Rev. Lett. 106, 256801] Published Mon Jun 20, 2011

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Energy Transport by Neutral Collective Excitations at the Quantum Hall Edge (2011)

E. V. Deviatov, A. Lorke, G. Biasiol, and L. Sorba

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-23

Description: Author(s): E. V. Deviatov, A. Lorke, G. Biasiol, and L. Sorba We use the edge of the quantum Hall sample to study the possibility for counterpropagating neutral collective excitations. A novel sample design allows us to independently investigate charge and energy transport along the edge. We experimentally observe an upstream energy transfer with respect to th... [Phys. Rev. Lett. 106, 256802] Published Wed Jun 22, 2011

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Deterministic Generation of Entangled Photons in Superconducting Resonator Arrays (2011)

Yong Hu and Lin Tian

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-23

Description: Author(s): Yong Hu and Lin Tian We present a scheme for the deterministic generation of entangled photon pairs in a superconducting resonator array. The resonators form a Jaynes-Cummings lattice via the coupling to superconducting qubits, and the Kerr-like nonlinearity arises due to the coupling. We show that entangled photons can... [Phys. Rev. Lett. 106, 257002] Published Wed Jun 22, 2011

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Evidence for Long-Lived Quasiparticles Trapped in Superconducting Point Contacts (2011)

M. Zgirski, L. Bretheau, Q. Le Masne, H. Pothier, D. Esteve, and C. Urbina

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-23

Description: Author(s): M. Zgirski, L. Bretheau, Q. Le Masne, H. Pothier, D. Esteve, and C. Urbina We have observed that the supercurrent across phase-biased, highly transmitting atomic size contacts is strongly reduced within a broad phase interval around π . We attribute this effect to quasiparticle trapping in one of the discrete subgap Andreev bound states formed at the contact. Trapping occur... [Phys. Rev. Lett. 106, 257003] Published Wed Jun 22, 2011

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Suppression of Zeeman Splitting of the Energy Levels of Exciton-Polariton Condensates in Semiconductor Microcavities in an External Magnetic Field (2011)

P. Walker, T. C. H. Liew, D. Sarkar, M. Durska, A. P. D. Love, M. S. Skolnick, J. S. Roberts, I. A. Shelykh, A. V. Kavokin, and D. N. Krizhanovskii

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-23

Description: Author(s): P. Walker, T. C. H. Liew, D. Sarkar, M. Durska, A. P. D. Love, M. S. Skolnick, J. S. Roberts, I. A. Shelykh, A. V. Kavokin, and D. N. Krizhanovskii A key property of equilibrium exciton-polariton condensates in semiconductor microcavities is the suppression of the Zeeman splitting under a magnetic field. By studying magnetophotoluminescence spectra from a GaAs microcavity, we show experimentally that a similar effect occurs in a nonequilibrium ... [Phys. Rev. Lett. 106, 257401] Published Wed Jun 22, 2011

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Observation of Dirac Holes and Electrons in a Topological Insulator (2011)

A. A. Taskin, Zhi Ren, Satoshi Sasaki, Kouji Segawa, and Yoichi Ando

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-28

Description: Author(s): A. A. Taskin, Zhi Ren, Satoshi Sasaki, Kouji Segawa, and Yoichi Ando We show that in the new topological-insulator compound Bi 1.5 Sb 0.5 Te 1.7 Se 1.3 one can achieve a surfaced-dominated transport where the surface channel contributes up to 70% of the total conductance. Furthermore, it was found that in this material the transport properties sharply reflect the time depen... [Phys. Rev. Lett. 107, 016801] Published Mon Jun 27, 2011

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Metacinnabar (β-HgS): A Strong 3D Topological Insulator with Highly Anisotropic Surface States (2011)

François Virot, Roland Hayn, Manuel Richter, and Jeroen van den Brink

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-09

Description: Author(s): François Virot, Roland Hayn, Manuel Richter, and Jeroen van den Brink We establish the presence of topologically protected edge states on the (001) surface of HgS in the zinc-blende structure using density-functional electronic structure calculations. The Dirac point of the edge state cone is very close to the bulk valence band maximum. The Dirac cone is extremely ani... [Phys. Rev. Lett. 106, 236806] Published Wed Jun 08, 2011

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LaCo_{2}B_{2}: A Co-Based Layered Superconductor with a ThCr_{2}Si_{2}-Type Structure (2011)

Hiroshi Mizoguchi, Toshiaki Kuroda, Toshio Kamiya, and Hideo Hosono

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-09

Description: Author(s): Hiroshi Mizoguchi, Toshiaki Kuroda, Toshio Kamiya, and Hideo Hosono LaCo 2 B 2 with a ThCr 2 Si 2 -type (so-called “122”) structure composed of alternately stacked La and CoB layers exhibits metallic electrical conductivity and Pauli paramagnetic behavior down to 2 K. Bulk superconductivity with a T c of ∼4 K emerges upon substituting with dopant elements, i.e., isovalent ... [Phys. Rev. Lett. 106, 237001] Published Wed Jun 08, 2011

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Strength of Effective Coulomb Interactions in Graphene and Graphite (2011)

T. O. Wehling, E. Şaşıoğlu, C. Friedrich, A. I. Lichtenstein, M. I. Katsnelson, and S. Blügel

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-09

Description: Author(s): T. O. Wehling, E. Şaşıoğlu, C. Friedrich, A. I. Lichtenstein, M. I. Katsnelson, and S. Blügel To obtain an effective many-body model of graphene and related materials from first principles we calculate the partially screened frequency dependent Coulomb interaction. In graphene, the effective on-site (Hubbard) interaction is U 00 =9.3 eV in close vicinity to the critical value separating condu... [Phys. Rev. Lett. 106, 236805] Published Wed Jun 08, 2011

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Spin Fluctuations in Normal State CeCu_{2}Si_{2} on Approaching the Quantum Critical Point (2011)

Julia Arndt, Oliver Stockert, Karin Schmalzl, Enrico Faulhaber, Hirale S. Jeevan, Christoph Geibel, Wolfgang Schmidt, Michael Loewenhaupt, and Frank Steglich

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-14

Description: Author(s): Julia Arndt, Oliver Stockert, Karin Schmalzl, Enrico Faulhaber, Hirale S. Jeevan, Christoph Geibel, Wolfgang Schmidt, Michael Loewenhaupt, and Frank Steglich We report on the magnetic excitation spectrum in the normal state of the heavy-fermion superconductor CeCu 2 Si 2 on approaching the quantum critical point (QCP). The magnetic response in the superconducting state is characterized by a transfer of spectral weight to energies above a spin excitation gap... [Phys. Rev. Lett. 106, 246401] Published Mon Jun 13, 2011

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Spin-Resolved Tunneling Studies of the Exchange Field in EuS/Al Bilayers (2011)

Y. M. Xiong, S. Stadler, P. W. Adams, and G. Catelani

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-15

Description: Author(s): Y. M. Xiong, S. Stadler, P. W. Adams, and G. Catelani We use spin-resolved electron tunneling to study the exchange field in the Al component of EuS/Al bilayers, in both the superconducting and normal-state phases of the Al. Contrary to expectation, we show that the exchange field H ex is a nonlinear function of applied field, even in applied fields tha... [Phys. Rev. Lett. 106, 247001] Published Tue Jun 14, 2011

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Metal-Insulator Transition in Ultrathin LaNiO_{3} Films (2011)

R. Scherwitzl, S. Gariglio, M. Gabay, P. Zubko, M. Gibert, and J.-M. Triscone

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-15

Description: Author(s): R. Scherwitzl, S. Gariglio, M. Gabay, P. Zubko, M. Gibert, and J.-M. Triscone Transport in ultrathin films of LaNiO 3 evolves from a metallic to a strongly localized character as the film’s thickness is reduced and the sheet resistance reaches a value close to h / e 2 , the quantum of resistance in two dimensions. In the intermediate regime, quantum corrections to the Drude low-te... [Phys. Rev. Lett. 106, 246403] Published Tue Jun 14, 2011

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Dephasing of Triplet-Sideband Optical Emission of a Resonantly Driven InAs/GaAs Quantum Dot inside a Microcavity (2011)

S. M. Ulrich, S. Ates, S. Reitzenstein, A. Löffler, A. Forchel, and P. Michler

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-17

Description: Author(s): S. M. Ulrich, S. Ates, S. Reitzenstein, A. Löffler, A. Forchel, and P. Michler Detailed properties of resonance fluorescence from a single quantum dot in a micropillar cavity are investigated, with particular focus on emission coherence in the dependence on optical driving field power and detuning. A power-dependent series over a wide range reveals characteristic Mollow triple... [Phys. Rev. Lett. 106, 247402] Published Thu Jun 16, 2011

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Phonon-Dressed Mollow Triplet in the Regime of Cavity Quantum Electrodynamics: Excitation-Induced Dephasing and Nonperturbative Cavity Feeding Effects (2011)

C. Roy and S. Hughes

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-17

Description: Author(s): C. Roy and S. Hughes We study the resonance fluorescence spectra of a driven quantum dot placed inside a high- Q semiconductor cavity and interacting with an acoustic phonon bath. The dynamics is calculated using a time-convolutionless master equation in the polaron frame. We predict pronounced spectral broadening of the... [Phys. Rev. Lett. 106, 247403] Published Thu Jun 16, 2011

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Magnons as a Bose-Einstein Condensate in Nanocrystalline Gadolinium (2011)

S. N. Kaul and S. P. Mathew

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-18

Description: Author(s): S. N. Kaul and S. P. Mathew The recent observation [S. P. Mathew et al. , J. Phys. Conf. Ser. 200 , 072047 (2010) ] of the anomalous softening of spin-wave modes at low temperatures in nanocrystalline gadolinium is interpreted as a Bose-Einstein condensation (BEC) of magnons. A self-consistent calculation, based on the BEC pictur... [Phys. Rev. Lett. 106, 247204] Published Fri Jun 17, 2011

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Electric Control of Spin Currents and Spin-Wave Logic (2011)

Tianyu Liu and G. Vignale

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-18

Description: Author(s): Tianyu Liu and G. Vignale Spin waves in insulating magnets are ideal carriers for spin currents with low energy dissipation. An electric field can modify the dispersion of spin waves, by directly affecting, via spin-orbit coupling, the electrons that mediate the interaction between magnetic ions. Our microscopic calculations... [Phys. Rev. Lett. 106, 247203] Published Fri Jun 17, 2011

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Class of Molecular and Solid State Systems with Correlated Magnetic and Dielectric Bistabilities Induced by the Pseudo Jahn-Teller Effect (2011)

Pablo Garcia-Fernandez and Isaac B. Bersuker

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-18

Description: Author(s): Pablo Garcia-Fernandez and Isaac B. Bersuker Based on the earlier revealed hidden pseudo Jahn-Teller effect which essentially involves excited electronic states we show that, with extension to solids, polyatomic systems with half-filled degenerate shells, e 2 or t 3 , form a novel (practically inexhaustible) class of molecular and solid state mat... [Phys. Rev. Lett. 106, 246406] Published Fri Jun 17, 2011

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Optical Coherent Control Induced by an Electric Field in a Semiconductor: A New Manifestation of the Franz-Keldysh Effect (2011)

J. K. Wahlstrand, H. Zhang, S. B. Choi, S. Kannan, D. S. Dessau, J. E. Sipe, and S. T. Cundiff

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-18

Description: Author(s): J. K. Wahlstrand, H. Zhang, S. B. Choi, S. Kannan, D. S. Dessau, J. E. Sipe, and S. T. Cundiff In (100)-oriented GaAs illuminated at normal incidence by a laser and its second harmonic, interference between one- and two-photon absorption results in ballistic current injection, but not modulation of the overall carrier injection rate. Results from a pump-probe experiment on a transversely bias... [Phys. Rev. Lett. 106, 247404] Published Fri Jun 17, 2011

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Disproportionation and Metallization at Low-Spin to High-Spin Transition in Multiorbital Mott Systems (2011)

Jan Kuneš and Vlastimil Křápek

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-22

Description: Author(s): Jan Kuneš and Vlastimil Křápek We study the thermally driven spin state transition in a two-orbital Hubbard model with crystal-field splitting, which provides a minimal description of the physics of LaCoO 3 . We employ the dynamical mean-field theory with a quantum Monte Carlo impurity solver. At intermediate temperatures we find a... [Phys. Rev. Lett. 106, 256401] Published Tue Jun 21, 2011

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Computation of Static Heisenberg-Chain Correlators: Control over Length and Temperature Dependence (2011)

Jun Sato, Britta Aufgebauer, Herman Boos, Frank Göhmann, Andreas Klümper, Minoru Takahashi, and Christian Trippe

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-24

Description: Author(s): Jun Sato, Britta Aufgebauer, Herman Boos, Frank Göhmann, Andreas Klümper, Minoru Takahashi, and Christian Trippe We communicate results on correlation functions for the spin- 1/2 Heisenberg chain in two particularly important cases: (a) for the infinite chain at arbitrary finite temperature T , and (b) for finite chains of arbitrary length L in the ground state. In both cases we present explicit formulas express... [Phys. Rev. Lett. 106, 257201] Published Thu Jun 23, 2011

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Quantitative Measurement of the Magnetic Exchange Interaction across a Vacuum Gap (2011)

R. Schmidt, C. Lazo, U. Kaiser, A. Schwarz, S. Heinze, and R. Wiesendanger

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-25

Description: Author(s): R. Schmidt, C. Lazo, U. Kaiser, A. Schwarz, S. Heinze, and R. Wiesendanger We demonstrate that magnetic exchange force spectroscopy allows for a quantitative determination of the distance-dependent magnetic exchange interaction across a vacuum gap. Experiments were performed on the antiferromagnetic Fe monolayer on W(001) with magnetically sensitive tips and compared to fi... [Phys. Rev. Lett. 106, 257202] Published Fri Jun 24, 2011

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Fermi-Edge Singularity in the Vicinity of the Resonant Scattering Condition (2011)

V. V. Mkhitaryan and M. E. Raikh

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-05-12

Description: Author(s): V. V. Mkhitaryan and M. E. Raikh Fermi-edge absorption theory predicting the spectrum A(ω)∝ω^{-2δ_{0} /π+δ_{0}^{2} /π^{2} } relies on the assumption that scattering phase δ_{0} is frequency independent. The dependence of δ_{0} on ω becomes crucial near the resonant condition, where the phase changes abruptly by π. In th... [Phys. Rev. Lett. 106, 197003] Published Wed May 11, 2011

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Metallic Behavior of Cyclotron Relaxation Time in Two-Dimensional Systems (2011)

Ryuichi Masutomi, Kohei Sasaki, Ippei Yasuda, Akihito Sekine, Kentarou Sawano, Yasuhiro Shiraki, and Tohru Okamoto

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-05-12

Description: Author(s): Ryuichi Masutomi, Kohei Sasaki, Ippei Yasuda, Akihito Sekine, Kentarou Sawano, Yasuhiro Shiraki, and Tohru Okamoto Cyclotron resonance of two-dimensional electrons is studied at low temperatures down to 0.4 K for a high-mobility Si/SiGe quantum well which exhibits a metallic temperature dependence of dc resistivity ρ. The relaxation time τ_{CR} shows a negative temperature dependence, which is similar to that... [Phys. Rev. Lett. 106, 196404] Published Wed May 11, 2011

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Electrostatic Conveyer for Excitons (2011)

A. G. Winbow, J. R. Leonard, M. Remeika, Y. Y. Kuznetsova, A. A. High, A. T. Hammack, L. V. Butov, J. Wilkes, A. A. Guenther, A. L. Ivanov, M. Hanson, and A. C. Gossard

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-05-13

Description: Author(s): A. G. Winbow, J. R. Leonard, M. Remeika, Y. Y. Kuznetsova, A. A. High, A. T. Hammack, L. V. Butov, J. Wilkes, A. A. Guenther, A. L. Ivanov, M. Hanson, and A. C. Gossard We report on the study of indirect excitons in moving lattices—conveyers created by a set of ac voltages applied to the electrodes on the sample surface. The wavelength of this moving lattice is set by the electrode periodicity, the amplitude is controlled by the applied voltage, and the velocity ... [Phys. Rev. Lett. 106, 196806] Published Thu May 12, 2011

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Internal Electron Diffraction from Atomically Ordered Subsurface Nanostructures in Metals (2011)

O. Kurnosikov, H. J. M. Swagten, and B. Koopmans

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-05-13

Description: Author(s): O. Kurnosikov, H. J. M. Swagten, and B. Koopmans We demonstrate that a part of interface at a subsurface nanocavity in Cu(110) can efficiently induce electron scattering back to the surface even if it is inclined with respect to the surface, if the condition for electron diffraction is fulfilled. This backscattering induces oscillations of electro... [Phys. Rev. Lett. 106, 196803] Published Thu May 12, 2011

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Numerical Study of Carrier Multiplication Pathways in Photoexcited Nanocrystal and Bulk Forms of PbSe (2011)

Kirill A. Velizhanin and Andrei Piryatinski

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-05-21

Description: Author(s): Kirill A. Velizhanin and Andrei Piryatinski Employing the interband exciton scattering model, we perform a numerical study of the direct photogeneration and population relaxation processes contributing to carrier multiplication (CM) in nanocrystalline and bulk PbSe. We argue that in both cases the impact ionization is the main mechanism of CM... [Phys. Rev. Lett. 106, 207401] Published Fri May 20, 2011

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Electrically Detected Magnetic Resonance of Neutral Donors Interacting with a Two-Dimensional Electron Gas (2011)

C. C. Lo, V. Lang, R. E. George, J. J. L. Morton, A. M. Tyryshkin, S. A. Lyon, J. Bokor, and T. Schenkel

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-05-21

Description: Author(s): C. C. Lo, V. Lang, R. E. George, J. J. L. Morton, A. M. Tyryshkin, S. A. Lyon, J. Bokor, and T. Schenkel We have measured the electrically detected magnetic resonance of donor-doped silicon field-effect transistors in resonant X - (9.7 GHz) and W -band (94 GHz) microwave cavities. The two-dimensional electron gas resonance signal increases by 2 orders of magnitude from X to W band, while the donor resona... [Phys. Rev. Lett. 106, 207601] Published Fri May 20, 2011

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Exciton-Spin Memory with a Semiconductor Quantum Dot Molecule (2011)

A. Boyer de la Giroday, N. Sköld, R. M. Stevenson, I. Farrer, D. A. Ritchie, and A. J. Shields

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-05-25

Description: Author(s): A. Boyer de la Giroday, N. Sköld, R. M. Stevenson, I. Farrer, D. A. Ritchie, and A. J. Shields We report on a single photon and spin storage device based on a semiconductor quantum dot molecule. Optically excited single electron-hole pairs are trapped within the molecule, and their recombination rate is electrically controlled over 3 orders of magnitude. Single photons are stored up to 1 μ s ... [Phys. Rev. Lett. 106, 216802] Published Tue May 24, 2011

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Band Bending in Conjugated Polymer Layers (2011)

Ilja Lange, James C. Blakesley, Johannes Frisch, Antje Vollmer, Norbert Koch, and Dieter Neher

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-05-26

Description: Author(s): Ilja Lange, James C. Blakesley, Johannes Frisch, Antje Vollmer, Norbert Koch, and Dieter Neher We use the Kelvin probe method to study the energy-level alignment of four conjugated polymers deposited on various electrodes. Band bending is observed in all polymers when the substrate work function exceeds critical values. Through modeling, we show that the band bending is explained by charge tr... [Phys. Rev. Lett. 106, 216402] Published Wed May 25, 2011

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Direct Measurement of the Out-of-Plane Spin Texture in the Dirac-Cone Surface State of a Topological Insulator (2011)

S. Souma, K. Kosaka, T. Sato, M. Komatsu, A. Takayama, T. Takahashi, M. Kriener, Kouji Segawa, and Yoichi Ando

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-05-26

Description: Author(s): S. Souma, K. Kosaka, T. Sato, M. Komatsu, A. Takayama, T. Takahashi, M. Kriener, Kouji Segawa, and Yoichi Ando We have performed spin- and angle-resolved photoemission spectroscopy of Bi 2 Te 3 and present the first direct evidence for the existence of the out-of-plane spin component on the surface state of a topological insulator. We found that the magnitude of the out-of-plane spin polarization on a hexagonal... [Phys. Rev. Lett. 106, 216803] Published Wed May 25, 2011

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Spin-Polarized Transient Electron Trapping in Phosphorus-Doped Silicon (2011)

Yuan Lu, Jing Li, and Ian Appelbaum

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-05-26

Description: Author(s): Yuan Lu, Jing Li, and Ian Appelbaum Experimental evidence of electron spin precession during travel through the phosphorus-doped Si channel of an all-electrical device simultaneously indicates two distinct processes: (i) short time scales ( ≈50 ps ) due to purely conduction-band transport from injector to detector and (ii) long time sc... [Phys. Rev. Lett. 106, 217202] Published Wed May 25, 2011

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Tracking the Effects of Interactions on Spinons in Gapless Heisenberg Chains (2011)

Jean-Sébastien Caux, Hitoshi Konno, Mark Sorrell, and Robert Weston

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-05-26

Description: Author(s): Jean-Sébastien Caux, Hitoshi Konno, Mark Sorrell, and Robert Weston We consider the effects of interactions on spinon excitations in Heisenberg spin- 1/2 chains. We compute the exact two-spinon part of the longitudinal structure factor of the infinite chain in zero field for all values of anisotropy in the gapless antiferromagnetic regime, via an exact algebraic appr... [Phys. Rev. Lett. 106, 217203] Published Wed May 25, 2011

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Photoinduced Melting of Antiferromagnetic Order in La_{0.5}Sr_{1.5}MnO_{4} Measured Using Ultrafast Resonant Soft X-Ray Diffraction (2011)

H. Ehrke, R. I. Tobey, S. Wall, S. A. Cavill, M. Först, V. Khanna, Th. Garl, N. Stojanovic, D. Prabhakaran, A. T. Boothroyd, M. Gensch, A. Mirone, P. Reutler, A. Revcolevschi, S. S. Dhesi, and A. Cavalleri

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-05-26

Description: Author(s): H. Ehrke, R. I. Tobey, S. Wall, S. A. Cavill, M. Först, V. Khanna, Th. Garl, N. Stojanovic, D. Prabhakaran, A. T. Boothroyd, M. Gensch, A. Mirone, P. Reutler, A. Revcolevschi, S. S. Dhesi, and A. Cavalleri We used ultrafast resonant soft x-ray diffraction to probe the picosecond dynamics of spin and orbital order in La 0.5 Sr 1.5 MnO 4 after photoexcitation with a femtosecond pulse of 1.5 eV radiation. Complete melting of antiferromagnetic spin order is evidenced by the disappearance of a (1/4,1/4,1/2) dif... [Phys. Rev. Lett. 106, 217401] Published Wed May 25, 2011

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Spin Resonance in EuTiO_{3} Probed by Time-Domain Gigahertz Ellipsometry (2011)

J. L. M. van Mechelen, D. van der Marel, I. Crassee, and T. Kolodiazhnyi

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-05-26

Description: Author(s): J. L. M. van Mechelen, D. van der Marel, I. Crassee, and T. Kolodiazhnyi We show an example of a purely magnetic spin resonance in EuTiO 3 and the resulting new record high Faraday rotation of 590°/mm at 1.6 T for 1 cm wavelengths probed by a novel technique of magneto-optical gigahertz time-domain ellipsometry. From our transmission measurements of linear polarized light... [Phys. Rev. Lett. 106, 217601] Published Wed May 25, 2011

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Both Electron and Hole Dirac Cone States in Ba(FeAs)_{2} Confirmed by Magnetoresistance (2011)

Khuong K. Huynh, Yoichi Tanabe, and Katsumi Tanigaki

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-05-26

Description: Author(s): Khuong K. Huynh, Yoichi Tanabe, and Katsumi Tanigaki Quantum transport of Dirac cone states in the iron pnictide Ba(FeAs) 2 with a d -multiband system is studied by using single crystal samples. Transverse magnetoresistance develops linearly against the magnetic field at low temperatures. The transport phenomena are interpreted in terms of the zeroth La... [Phys. Rev. Lett. 106, 217004] Published Wed May 25, 2011

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Theory of Carrier Concentration-Dependent Electronic Behavior in Layered Cobaltates (2011)

H. Li, R. T. Clay, and S. Mazumdar

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-05-26

Description: Author(s): H. Li, R. T. Clay, and S. Mazumdar A natural explanation for the carrier concentration-dependent electronic behavior in the layered cobaltates emerges within correlated-electron Hamiltonians with finite on-site and significant nearest neighbor hole-hole Coulomb repulsions. The nearest neighbor repulsion decreases hole double occupanc... [Phys. Rev. Lett. 106, 216401] Published Wed May 25, 2011

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Real-Time Observation of Discrete Andreev Tunneling Events (2011)

V. F. Maisi, O.-P. Saira, Yu. A. Pashkin, J. S. Tsai, D. V. Averin, and J. P. Pekola

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-05-26

Description: Author(s): V. F. Maisi, O.-P. Saira, Yu. A. Pashkin, J. S. Tsai, D. V. Averin, and J. P. Pekola We provide a direct proof of two-electron Andreev transitions in a superconductor–normal-metal tunnel junction by detecting them in a real-time electron counting experiment. Our results are consistent with ballistic Andreev transport with an order of magnitude higher rate than expected for a uniform... [Phys. Rev. Lett. 106, 217003] Published Wed May 25, 2011

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Anomalous Decoherence Effect in a Quantum Bath (2011)

Nan Zhao, Zhen-Yu Wang, and Ren-Bao Liu

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-05-27

Description: Author(s): Nan Zhao, Zhen-Yu Wang, and Ren-Bao Liu Decoherence of quantum objects in noisy environments is important in quantum sciences and technologies. It is generally believed that different processes coupled to the same noise source have similar decoherence behaviors and stronger noises cause faster decoherence. Here we show that in a quantum b... [Phys. Rev. Lett. 106, 217205] Published Thu May 26, 2011

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Anisotropic Hysteretic Hall Effect and Magnetic Control of Chiral Domains in the Chiral Spin States of Pr_{2}Ir_{2}O_{7} (2011)

L. Balicas, S. Nakatsuji, Y. Machida, and S. Onoda

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-05-27

Description: Author(s): L. Balicas, S. Nakatsuji, Y. Machida, and S. Onoda We uncover a strong anisotropy in both the anomalous Hall effect (AHE) and the magnetoresistance of the chiral spin states of Pr 2 Ir 2 O 7 . The AHE appearing below 1.5 K at a zero magnetic field shows hysteresis which is most pronounced for fields cycled along the [111] direction. This hysteresis is com... [Phys. Rev. Lett. 106, 217204] Published Thu May 26, 2011

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Structural Secrets of Multiferroic Interfaces (2011)

H. L. Meyerheim, F. Klimenta, A. Ernst, K. Mohseni, S. Ostanin, M. Fechner, S. Parihar, I. V. Maznichenko, I. Mertig, and J. Kirschner

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-02-24

Description: Author(s): H. L. Meyerheim, F. Klimenta, A. Ernst, K. Mohseni, S. Ostanin, M. Fechner, S. Parihar, I. V. Maznichenko, I. Mertig, and J. Kirschner We present an experimental and theoretical study of the geometric structure of ultrathin BaTiO_{3} films grown on Fe(001). Surface x-ray diffraction reveals that the films are terminated by a BaO layer, while the TiO_{2} layer is next to the top Fe layer. Cations in termination layers have incomplet... [Phys. Rev. Lett. 106, 087203] Published Wed Feb 23, 2011

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Hybridization Wave as the “Hidden Order” in URu_{2} Si_{2} (2011)

Yonatan Dubi and Alexander V. Balatsky

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-02-24

Description: Author(s): Yonatan Dubi and Alexander V. Balatsky A phenomenological model for the “hidden order” transition in the heavy-Fermion material URu_{2} Si_{2} is introduced. The hidden order is identified as an incommensurate, momentum-carrying hybridization between the light hole band and the heavy electron band. This modulated hybridization appear... [Phys. Rev. Lett. 106, 086401] Published Wed Feb 23, 2011

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Disorder-Mediated Electron Valley Resonance in Carbon Nanotube Quantum Dots (2011)

András Pályi and Guido Burkard

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-02-24

Description: Author(s): András Pályi and Guido Burkard We propose a scheme for coherent rotation of the valley isospin of a single electron confined in a carbon nanotube quantum dot. The scheme exploits the ubiquitous atomic disorder of the nanotube crystal lattice, which induces time-dependent valley mixing as the confined electron is pushed back and f... [Phys. Rev. Lett. 106, 086801] Published Wed Feb 23, 2011

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Imaging and Control of Surface Magnetization Domains in a Magnetoelectric Antiferromagnet (2011)

Ning Wu, Xi He, Aleksander L. Wysocki, Uday Lanke, Takashi Komesu, Kirill D. Belashchenko, Christian Binek, and Peter A. Dowben

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-02-24

Description: Author(s): Ning Wu, Xi He, Aleksander L. Wysocki, Uday Lanke, Takashi Komesu, Kirill D. Belashchenko, Christian Binek, and Peter A. Dowben We report the direct observation of surface magnetization domains of the magnetoelectric Cr_{2} O_{3} using photoemission electron microscopy with magnetic circular dichroism contrast and magnetic force microscopy. The domain pattern is strongly affected by the applied electric field conditions. Zer... [Phys. Rev. Lett. 106, 087202] Published Wed Feb 23, 2011

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Towards the Identification of a Quantum Critical Line in the (p, B) Phase Diagram of CeCoIn_{5} with Thermal-Expansion Measurements (2011)

S. Zaum, K. Grube, R. Schäfer, E. D. Bauer, J. D. Thompson, and H. v. Löhneysen

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-02-24

Description: Author(s): S. Zaum, K. Grube, R. Schäfer, E. D. Bauer, J. D. Thompson, and H. v. Löhneysen The low-temperature thermal expansion of CeCoIn_{5} single crystals measured parallel and perpendicular to magnetic fields B oriented along the c axis yields the volume thermal-expansion coefficient β. Considerable deviations of β(T) from Fermi-liquid behavior occur already within the superconduct... [Phys. Rev. Lett. 106, 087003] Published Wed Feb 23, 2011

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Cooling of Nanomechanical Resonators by Thermally Activated Single-Electron Transport (2011)

F. Santandrea, L. Y. Gorelik, R. I. Shekhter, and M. Jonson

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-05-06

Description: Author(s): F. Santandrea, L. Y. Gorelik, R. I. Shekhter, and M. Jonson We show that the vibrations of a nanomechanical resonator can be cooled to near its quantum ground state by tunneling injection of electrons from a scanning tunneling microscope tip. The interplay between two mechanisms for coupling the electronic and mechanical degrees of freedom results in a bias-... [Phys. Rev. Lett. 106, 186803] Published Thu May 05, 2011

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Numerical Calculation of the Neutral Fermion Gap at the ν=5/2 Fractional Quantum Hall State (2011)

Parsa Bonderson, Adrian E. Feiguin, and Chetan Nayak

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-05-06

Description: Author(s): Parsa Bonderson, Adrian E. Feiguin, and Chetan Nayak We present the first numerical computation of the neutral fermion gap, Δ_{F} , in the ν=5/2 quantum Hall state, which is analogous to the energy gap for a Bogoliubov-de Gennes quasiparticle in a superconductor. We find Δ_{F} ≈0.027e^{2} /εℓ_{0} , comparable to the charge gap. We also deduce ... [Phys. Rev. Lett. 106, 186802] Published Thu May 05, 2011

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Blueshifting the Onset of Optical UV Absorption for Water under Pressure (2011)

Andreas Hermann and Peter Schwerdtfeger

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-05-07

Description: Author(s): Andreas Hermann and Peter Schwerdtfeger First-principles calculations show that the optical UV absorption onset of solid water is blueshifted with increasing pressure. Across several crystal structures and a wide pressure range, the optical gap increases almost linearly with external pressure, making solid water more transparent. The orig... [Phys. Rev. Lett. 106, 187403] Published Fri May 06, 2011

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Renormalization of Optical Excitations in Molecules near a Metal Surface (2011)

J. M. Garcia-Lastra and K. S. Thygesen

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-05-07

Description: Author(s): J. M. Garcia-Lastra and K. S. Thygesen The lowest electronic excitations of benzene and a set of donor-acceptor molecular complexes are calculated for the gas phase and on the Al(111) surface using the many-body Bethe-Salpeter equation. The energy of the charge-transfer excitations obtained for the gas phase complexes are found to be aro... [Phys. Rev. Lett. 106, 187402] Published Fri May 06, 2011

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Slow Conductance Relaxation in Insulating Granular Al: Evidence for Screening Effects (2011)

J. Delahaye, J. Honoré, and T. Grenet

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-05-07

Description: Author(s): J. Delahaye, J. Honoré, and T. Grenet It is shown that the conductance relaxations observed in electrical field effect measurements on granular Al films are the sum of two contributions. One is sensitive to gate voltage changes and gives the already reported anomalous electrical field effect. The other one is independent of the gate vol... [Phys. Rev. Lett. 106, 186602] Published Fri May 06, 2011

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Mechanism for Explaining Differences in the Order Parameters of FeAs-Based and FeP-Based Pnictide Superconductors (2011)

Ronny Thomale, Christian Platt, Werner Hanke, and B. Andrei Bernevig

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-05-07

Description: Author(s): Ronny Thomale, Christian Platt, Werner Hanke, and B. Andrei Bernevig We put forward a scenario that explains the difference between the order-parameter character in arsenide (As) and phosphorous (P) iron-based superconductors. Using functional renormalization group to analyze it in detail, we find that nodal superconductivity on the electron pockets (hole pocket gaps... [Phys. Rev. Lett. 106, 187003] Published Fri May 06, 2011

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Electronic Structure of Superconducting KC_{8} and Nonsuperconducting LiC_{6} Graphite Intercalation Compounds: Evidence for a Graphene-Sheet-Driven Superconducting State (2011)

Z.-H. Pan, J. Camacho, M. H. Upton, A. V. Fedorov, C. A. Howard, M. Ellerby, and T. Valla

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-05-07

Description: Author(s): Z.-H. Pan, J. Camacho, M. H. Upton, A. V. Fedorov, C. A. Howard, M. Ellerby, and T. Valla We have performed photoemission studies of the electronic structure in LiC_{6} and KC_{8} , a nonsuperconducting and a superconducting graphite intercalation compound, respectively. We have found that the charge transfer from the intercalant layers to graphene layers is larger in KC_{8} than in LiC_... [Phys. Rev. Lett. 106, 187002] Published Fri May 06, 2011

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Rods of Neutron Scattering Intensity in Yb_{2} Ti_{2} O_{7} : Compelling Evidence for Significant Anisotropic Exchange in a Magnetic Pyrochlore Oxide (2011)

Jordan D. Thompson, Paul A. McClarty, Henrik M. Rønnow, Louis P. Regnault, Andreas Sorge, and Michel J. P. Gingras

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-05-07

Description: Author(s): Jordan D. Thompson, Paul A. McClarty, Henrik M. Rønnow, Louis P. Regnault, Andreas Sorge, and Michel J. P. Gingras Paramagnetic correlations in the magnetic material Yb_{2} Ti_{2} O_{7} have been investigated via neutron scattering, revealing a [111] rod of scattering intensity. Assuming interactions between the Yb^{3+} ions composed of all symmetry-allowed nearest neighbor exchange interactions and long-range d... [Phys. Rev. Lett. 106, 187202] Published Fri May 06, 2011

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Coherent Heavy Quasiparticles in a CePt_{5} Surface Alloy (2011)

M. Klein, A. Nuber, H. Schwab, C. Albers, N. Tobita, M. Higashiguchi, J. Jiang, S. Fukuda, K. Tanaka, K. Shimada, M. Mulazzi, F. F. Assaad, and F. Reinert

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-05-07

Description: Author(s): M. Klein, A. Nuber, H. Schwab, C. Albers, N. Tobita, M. Higashiguchi, J. Jiang, S. Fukuda, K. Tanaka, K. Shimada, M. Mulazzi, F. F. Assaad, and F. Reinert We report on the results of a high-resolution angle-resolved photoemission study on the ordered surface alloy CePt_{5} . The temperature dependence of the spectra show the formation of the coherent low-energy heavy-fermion band near the Fermi level. These experimental data are supported by a multiba... [Phys. Rev. Lett. 106, 186407] Published Fri May 06, 2011

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Semiclassical Neutral Atom as a Reference System in Density Functional Theory (2011)

Lucian A. Constantin, E. Fabiano, S. Laricchia, and F. Della Sala

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-05-07

Description: Author(s): Lucian A. Constantin, E. Fabiano, S. Laricchia, and F. Della Sala We use the asymptotic expansions of the semiclassical neutral atom as a reference system in density functional theory to construct accurate generalized gradient approximations (GGAs) for the exchange-correlation and kinetic energies without any empiricism. These asymptotic functionals are among the ... [Phys. Rev. Lett. 106, 186406] Published Fri May 06, 2011

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Pressure-Induced Valence Crossover in Superconducting CeCu_{2} Si_{2} (2011)

J.-P. Rueff, S. Raymond, M. Taguchi, M. Sikora, J.-P. Itié, F. Baudelet, D. Braithwaite, G. Knebel, and D. Jaccard

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-05-07

Description: Author(s): J.-P. Rueff, S. Raymond, M. Taguchi, M. Sikora, J.-P. Itié, F. Baudelet, D. Braithwaite, G. Knebel, and D. Jaccard Measurement of the Ce valence in the heavy fermion CeCu_{2} Si_{2} is reported for the first time under pressure and at low temperature (T=14 K) in proximity of the superconducting region. CeCu_{2} Si_{2} is considered as a strong candidate for a new type of pairing mechanism related to critica... [Phys. Rev. Lett. 106, 186405] Published Fri May 06, 2011

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Unconventional High-Temperature Superconductivity from Repulsive Interactions: Theoretical Constraints (2011)

A. S. Alexandrov and V. V. Kabanov

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-04-01

Description: Author(s): A. S. Alexandrov and V. V. Kabanov Unconventional symmetries of the order parameter allowed some researchers to maintain that a purely repulsive interaction between electrons provides superconductivity without phonons in a number of high-temperature superconductors. It is shown that the Cooper pairing in p and d states is not possibl... [Phys. Rev. Lett. 106, 136403] Published Thu Mar 31, 2011

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Effect of Measurement Backaction on Adiabatic Coherent Electron Transport (2011)

Jérôme Rech and Stefan Kehrein

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-04-01

Description: Author(s): Jérôme Rech and Stefan Kehrein We study the backaction of a nearby measurement device on electrons undergoing coherent transfer via adiabatic passage (CTAP) in a triple-well system. The measurement is provided by a quantum point contact capacitively coupled to the middle well. We account for this continuous measurement by treatin... [Phys. Rev. Lett. 106, 136808] Published Thu Mar 31, 2011

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Evolution of Paramagnetic Quasiparticle Excitations Emerged in the High-Field Superconducting Phase of CeCoIn_{5} (2011)

K. Kumagai, H. Shishido, T. Shibauchi, and Y. Matsuda

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-03-31

Description: Author(s): K. Kumagai, H. Shishido, T. Shibauchi, and Y. Matsuda We present ^{115} In NMR measurements in a novel thermodynamic phase of CeCoIn_{5} in a high magnetic field, where exotic superconductivity exists with the incommensurate spin-density wave order. We show that the NMR spectra in this phase provide direct evidence for the emergence of the spatially di... [Phys. Rev. Lett. 106, 137004] Published Wed Mar 30, 2011

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Optical Detection of Attosecond Ionization Induced by a Few-Cycle Laser Field in a Transparent Dielectric Material (2011)

Alexander V. Mitrofanov, Aart J. Verhoef, Evgenii E. Serebryannikov, Julien Lumeau, Leonid Glebov, Aleksei M. Zheltikov, and Andrius Baltuška

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-04-05

Description: Author(s): Alexander V. Mitrofanov, Aart J. Verhoef, Evgenii E. Serebryannikov, Julien Lumeau, Leonid Glebov, Aleksei M. Zheltikov, and Andrius Baltuška We observe an optical signature induced by the modulation of electron density inside a bulk transparent solid that is quasiperiodically ionized on an attosecond time scale by electric field peaks of a focused few-cycle laser pulse. The emitted optical signal resulting from the attosecond ionization ... [Phys. Rev. Lett. 106, 147401] Published Mon Apr 04, 2011

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Spin-Incoherent Behavior in the Ground State of Strongly Correlated Systems (2011)

Adrian E. Feiguin and Gregory A. Fiete

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-04-05

Description: Author(s): Adrian E. Feiguin and Gregory A. Fiete It is commonly believed that strongly interacting one-dimensional Fermi systems with gapless excitations are effectively described by Luttinger liquid theory. However, when the temperature of the system is high compared to the spin energy, but small compared to the charge energy, the system becomes ... [Phys. Rev. Lett. 106, 146401] Published Mon Apr 04, 2011

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Macrospin Tunneling and Magnetopolaritons with Nanomechanical Interference (2011)

Alexey A. Kovalev, Lorien X. Hayden, Gerrit E. W. Bauer, and Yaroslav Tserkovnyak

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-04-05

Description: Author(s): Alexey A. Kovalev, Lorien X. Hayden, Gerrit E. W. Bauer, and Yaroslav Tserkovnyak We theoretically address the quantum dynamics of a nanomechanical resonator coupled to the macrospin of a magnetic nanoparticle by both instanton and perturbative approaches. We demonstrate suppression of the tunneling between opposite magnetizations and destruction of magnetopolaritons (coherent ma... [Phys. Rev. Lett. 106, 147203] Published Mon Apr 04, 2011

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Twisted Hubbard Model for Sr_{2} IrO_{4} : Magnetism and Possible High Temperature Superconductivity (2011)

Fa Wang and T. Senthil

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-03-31

Description: Author(s): Fa Wang and T. Senthil Sr_{2} IrO_{4} has been suggested as a Mott insulator from a single J_{eff} =1/2 band, similar to the cuprates. However, this picture is complicated by the measured large magnetic anisotropy and ferromagnetism. Based on a careful mapping to the J_{eff} =1/2 (pseudospin-1/2) space, we propose that th... [Phys. Rev. Lett. 106, 136402] Published Wed Mar 30, 2011

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Properties of Hydrogen Terminated Diamond as a Photocathode (2011)

J. D. Rameau, J. Smedley, E. M. Muller, T. E. Kidd, and P. D. Johnson

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-03-31

Description: Author(s): J. D. Rameau, J. Smedley, E. M. Muller, T. E. Kidd, and P. D. Johnson Electron emission from the negative electron affinity (NEA) surface of hydrogen terminated, boron doped diamond in the [100] orientation is investigated using angle resolved photoemission spectroscopy (ARPES). ARPES measurements using 16 eV synchrotron and 6 eV laser light are compared and found t... [Phys. Rev. Lett. 106, 137602] Published Wed Mar 30, 2011

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Plasmon Response of a Quantum-Confined Electron Gas Probed by Core-Level Photoemission (2011)

Mustafa M. Özer, Eun Ju Moon, Adolfo G. Eguiluz, and Hanno H. Weitering

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-05-11

Description: Author(s): Mustafa M. Özer, Eun Ju Moon, Adolfo G. Eguiluz, and Hanno H. Weitering We demonstrate the existence of quantized “bulk” plasmons in ultrathin magnesium films on Si(111) by analyzing plasmon-loss satellites in core-level photoemission spectra, recorded as a function of the film thickness d. Remarkably, the plasmon energy is shown to vary as 1/d^{2} all the way down ... [Phys. Rev. Lett. 106, 197601] Published Tue May 10, 2011

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Spin-Spin Interactions in Organic Magnetoresistance Probed by Angle-Dependent Measurements (2011)

W. Wagemans, A. J. Schellekens, M. Kemper, F. L. Bloom, P. A. Bobbert, and B. Koopmans

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-05-11

Description: Author(s): W. Wagemans, A. J. Schellekens, M. Kemper, F. L. Bloom, P. A. Bobbert, and B. Koopmans The dependence of organic magnetoresistance (OMAR) on the orientation of the magnetic field has been investigated. In contrast with previous claims, a finite and systematic change in magnitude is observed when the orientation of the field is changed with respect to the sample. It is demonstrated tha... [Phys. Rev. Lett. 106, 196802] Published Tue May 10, 2011

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Bulk Band Gap and Surface State Conduction Observed in Voltage-Tuned Crystals of the Topological Insulator Bi_{2} Se_{3} (2011)

J. G. Checkelsky, Y. S. Hor, R. J. Cava, and N. P. Ong

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-05-11

Description: Author(s): J. G. Checkelsky, Y. S. Hor, R. J. Cava, and N. P. Ong We report a transport study of exfoliated few monolayer crystals of topological insulator Bi_{2} Se_{3} in an electric field effect geometry. By doping the bulk crystals with Ca, we are able to fabricate devices with sufficiently low bulk carrier density to change the sign of the Hall density with t... [Phys. Rev. Lett. 106, 196801] Published Tue May 10, 2011

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Resonant Tunneling through Electronic Trapping States in Thin MgO Magnetic Junctions (2011)

J. M. Teixeira, J. Ventura, J. P. Araujo, J. B. Sousa, P. Wisniowski, S. Cardoso, and P. P. Freitas

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-05-11

Description: Author(s): J. M. Teixeira, J. Ventura, J. P. Araujo, J. B. Sousa, P. Wisniowski, S. Cardoso, and P. P. Freitas We report an inelastic electron tunneling spectroscopy study on MgO magnetic junctions with thin barriers (0.85–1.35 nm). Inelastic electron tunneling spectroscopy reveals resonant electronic trapping within the barrier for voltages V〉0.15 V. These trapping features are associated with defect... [Phys. Rev. Lett. 106, 196601] Published Tue May 10, 2011

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Ferromagnetic Enhancement of CE-Type Spin Ordering in (Pr,Ca)MnO_{3} (2011)

S. Y. Zhou, Y. Zhu, M. C. Langner, Y.-D. Chuang, P. Yu, W. L. Yang, A. G. Cruz Gonzalez, N. Tahir, M. Rini, Y.-H. Chu, R. Ramesh, D.-H. Lee, Y. Tomioka, Y. Tokura, Z. Hussain, and R. W. Schoenlein

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-05-05

Description: Author(s): S. Y. Zhou, Y. Zhu, M. C. Langner, Y.-D. Chuang, P. Yu, W. L. Yang, A. G. Cruz Gonzalez, N. Tahir, M. Rini, Y.-H. Chu, R. Ramesh, D.-H. Lee, Y. Tomioka, Y. Tokura, Z. Hussain, and R. W. Schoenlein We present resonant soft x-ray scattering results from small bandwidth manganites (Pr,Ca)MnO_{3} , which show that the CE-type spin ordering (SO) at the phase boundary is stabilized only below the canted antiferromagnetic transition temperature and enhanced by ferromagnetism in the macroscopically i... [Phys. Rev. Lett. 106, 186404] Published Wed May 04, 2011

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Defects in Heavy-Fermion Materials: Unveiling Strong Correlations in Real Space (2011)

Jeremy Figgins and Dirk K. Morr

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-08-03

Description: Author(s): Jeremy Figgins and Dirk K. Morr Defects provide important insight into the complex electronic and magnetic structure of heavy-fermion materials by inducing qualitatively different real-space perturbations in the electronic and magnetic correlations of the system. These perturbations possess direct experimental signatures in the lo... [Phys. Rev. Lett. 107, 066401] Published Tue Aug 02, 2011

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Ab Initio Calculation of the Gilbert Damping Parameter via the Linear Response Formalism (2011)

H. Ebert, S. Mankovsky, D. Ködderitzsch, and P. J. Kelly

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-08-03

Description: Author(s): H. Ebert, S. Mankovsky, D. Ködderitzsch, and P. J. Kelly A Kubo-Greenwood-like equation for the Gilbert damping parameter α is presented that is based on the linear response formalism. Its implementation using the fully relativistic Korringa-Kohn-Rostoker band structure method in combination with coherent potential approximation alloy theory allows it to ... [Phys. Rev. Lett. 107, 066603] Published Tue Aug 02, 2011

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Electronic versus Lattice Match for Metal-Semiconductor Epitaxial Growth: Pb on Ge(111) (2011)

S.-J. Tang, Chang-Yeh Lee, Chien-Chung Huang, Tay-Rong Chang, Cheng-Maw Cheng, Ku-Ding Tsuei, H.-T. Jeng, V. Yeh, and Tai-Chang Chiang

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-08-03

Description: Author(s): S.-J. Tang, Chang-Yeh Lee, Chien-Chung Huang, Tay-Rong Chang, Cheng-Maw Cheng, Ku-Ding Tsuei, H.-T. Jeng, V. Yeh, and Tai-Chang Chiang Lattice match is important for epitaxial growth. We show that a competing mechanism, electronic match, can dominate at small film thicknesses for metal-semiconductor systems, where quantum confinement and symmetry requirements may favor a different growth pattern. For Pb(111) on Ge(111), an accident... [Phys. Rev. Lett. 107, 066802] Published Tue Aug 02, 2011

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Origin of Excess Low-Energy States in a Disordered Superconductor in a Zeeman Field (2011)

Y. L. Loh, N. Trivedi, Y. M. Xiong, P. W. Adams, and G. Catelani

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-08-03

Description: Author(s): Y. L. Loh, N. Trivedi, Y. M. Xiong, P. W. Adams, and G. Catelani Tunneling density of states measurements of disordered superconducting Al films in high Zeeman fields reveal a significant population of subgap states which cannot be explained by standard BCS theory. We provide a natural explanation of these excess states in terms of a novel disordered Larkin-Ovchi... [Phys. Rev. Lett. 107, 067003] Published Tue Aug 02, 2011

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Measurements of the Anisotropic In-Plane Resistivity of Underdoped FeAs-Based Pnictide Superconductors (2011)

J. J. Ying, X. F. Wang, T. Wu, Z. J. Xiang, R. H. Liu, Y. J. Yan, A. F. Wang, M. Zhang, G. J. Ye, P. Cheng, J. P. Hu, and X. H. Chen

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-08-03

Description: Author(s): J. J. Ying, X. F. Wang, T. Wu, Z. J. Xiang, R. H. Liu, Y. J. Yan, A. F. Wang, M. Zhang, G. J. Ye, P. Cheng, J. P. Hu, and X. H. Chen We systematically investigated the in-plane resistivity anisotropy of electron-underdoped EuFe 2-x Co x As 2 and BaFe 2-x Co x As 2 and hole-underdoped Ba 1-x K x Fe 2 As 2 . Large in-plane resistivity anisotropy was found in the former samples, while tiny in-plane resistivity anisotropy was detected in the latter on... [Phys. Rev. Lett. 107, 067001] Published Tue Aug 02, 2011

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