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Quantum Hall effect in monolayer-bilayer graphene planar junctions (2013)

Jifa Tian, Yongjin Jiang, Isaac Childres, Helin Cao, Jiangping Hu, and Yong P. Chen

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-07

Description: Author(s): Jifa Tian, Yongjin Jiang, Isaac Childres, Helin Cao, Jiangping Hu, and Yong P. Chen The Hall resistance of a homogeneous electron system is well known to be antisymmetric with respect to the magnetic field and the sign of charge carriers. We have observed that such symmetries no longer hold in planar hybrid structures consisting of partly single layer graphene (SLG) and partly bila... [Phys. Rev. B 88, 125410] Published Fri Sep 06, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Beyond-mean-field behavior of large Bose-Einstein condensates in double-well potentials (2013)

Bettina Gertjerenken and Christoph Weiss

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-07

Description: Author(s): Bettina Gertjerenken and Christoph Weiss For the dynamics of Bose-Einstein condensates (BECs), differences between mean-field (Gross-Pitaevskii) physics and N -particle quantum physics often disappear if the BEC becomes larger and larger. In particular, the time scale for which both dynamics agree should thus become larger if the particle n... [Phys. Rev. A 88, 033608] Published Fri Sep 06, 2013

Keywords: Matter waves and collective properties of cold atoms and molecules

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Damping in Yttrium Iron Garnet Nanoscale Films Capped by Platinum (2013)

Yiyan Sun, Houchen Chang, Michael Kabatek, Young-Yeal Song, Zihui Wang, Michael Jantz, William Schneider, Mingzhong Wu, E. Montoya, B. Kardasz, B. Heinrich, Suzanne G. E. te Velthuis, Helmut Schultheiss, and Axel Hoffmann

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-09-07

Description: Author(s): Yiyan Sun, Houchen Chang, Michael Kabatek, Young-Yeal Song, Zihui Wang, Michael Jantz, William Schneider, Mingzhong Wu, E. Montoya, B. Kardasz, B. Heinrich, Suzanne G. E. te Velthuis, Helmut Schultheiss, and Axel Hoffmann Strong damping enhancement in nm-thick yttrium iron garnet (YIG) films due to Pt capping layers was observed. This damping is substantially larger than the expected damping due to conventional spin pumping, is accompanied by a shift in the ferromagnetic resonance field, and can be suppressed by the ... [Phys. Rev. Lett. 111, 106601] Published Fri Sep 06, 2013

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Experimental Demonstration of Scanned Spin-Precession Microscopy (2013)

V. P. Bhallamudi, C. S. Wolfe, V. P. Amin, D. E. Labanowski, A. J. Berger, D. Stroud, J. Sinova, and P. C. Hammel

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-09-11

Description: Author(s): V. P. Bhallamudi, C. S. Wolfe, V. P. Amin, D. E. Labanowski, A. J. Berger, D. Stroud, J. Sinova, and P. C. Hammel We present a new tool for imaging spin properties. We show that a spatially averaged spin signal, measured as a function of a scanned magnetic probe’s position, contains information about the local spin properties. In this first demonstration we map the injected spin density in GaAs by measuring spi... [Phys. Rev. Lett. 111, 117201] Published Tue Sep 10, 2013

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Zeeman coupling and screening corrections to skyrmion excitations in graphene (2013)

Wenchen Luo and R. Côté

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-12

Description: Author(s): Wenchen Luo and R. Côté At half-filling of the fourfold degenerate Landau levels | n |≥1 in graphene, the ground states are spin-polarized quantum Hall states that support spin skyrmion excitations for | n |=1,2,3. Working in the Hartree-Fock approximation, we compute the excitation energy of an unbound spin skyrmion-antiskyrm... [Phys. Rev. B 88, 115417] Published Wed Sep 11, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Flexural mode of graphene on a substrate (2013)

Bruno Amorim and Francisco Guinea

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-12

Description: Author(s): Bruno Amorim and Francisco Guinea Out of plane vibrations are suppressed in graphene layers placed on a substrate. These vibrations, in suspended samples, are relevant for the understanding of properties such as the electrical resistivity, the thermal expansion coefficient, and others. We use a general framework to study the propert... [Phys. Rev. B 88, 115418] Published Wed Sep 11, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Thermodynamics of strongly correlated one-dimensional Bose gases (2013)

Andreas Vogler, Ralf Labouvie, Felix Stubenrauch, Giovanni Barontini, Vera Guarrera, and Herwig Ott

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-12

Description: Author(s): Andreas Vogler, Ralf Labouvie, Felix Stubenrauch, Giovanni Barontini, Vera Guarrera, and Herwig Ott We investigate the thermodynamics of one-dimensional (1D) Bose gases in the strongly correlated regime. To this end, we prepare ensembles of independent 1D Bose gases in a two-dimensional optical lattice and perform high-resolution in situ imaging of the column-integrated density distribution. Using... [Phys. Rev. A 88, 031603] Published Wed Sep 11, 2013

Keywords: Matter waves and collective properties of cold atoms and molecules

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Large quantum superpositions of a levitated nanodiamond through spin-optomechanical coupling (2013)

Zhang-qi Yin, Tongcang Li, Xiang Zhang, and L. M. Duan

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-12

Description: Author(s): Zhang-qi Yin, Tongcang Li, Xiang Zhang, and L. M. Duan We propose a method to generate and detect large quantum superposition states and arbitrary Fock states for the oscillational mode of an optically levitated nanocrystal diamond. The nonlinear interaction required for the generation of non-Gaussian quantum states is enabled through the spin-mechanica... [Phys. Rev. A 88, 033614] Published Wed Sep 11, 2013

Keywords: Matter waves and collective properties of cold atoms and molecules

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Mode conversion and long-lived vibrational modes in lead monolayers on silicon (111) after femtosecond laser excitation: A molecular dynamics simulation (2013)

Sung Sakong, Peter Kratzer, Simone Wall, Annika Kalus, and Michael Horn-von Hoegen

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-12

Description: Author(s): Sung Sakong, Peter Kratzer, Simone Wall, Annika Kalus, and Michael Horn-von Hoegen The dynamics of vibrations localized in a monolayer of Pb on Si(111) is studied using density functional theory and molecular dynamics methods. Recently, a pump-probe experiment has given direct access to the relaxation dynamics of the vibrational excitations in Pb, revealing two distinct time scale... [Phys. Rev. B 88, 115419] Published Wed Sep 11, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Dielectric screening and plasmons in AA-stacked bilayer graphene (2013)

Rafael Roldán and Luis Brey

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-14

Description: Author(s): Rafael Roldán and Luis Brey The screening properties and collective excitations (plasmons) in AA-stacked bilayer graphene are studied within the random phase approximation. Whereas long-lived plasmons in single-layer graphene and in AB-stacked bilayer graphene can exist only in doped samples, we find that coherent plasmons can... [Phys. Rev. B 88, 115420] Published Fri Sep 13, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Postadiabatic Hamiltonian for low-energy excitations in a slowly-time-dependent BCS-BEC crossover (2013)

Bernhard M. Breid and James R. Anglin

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-17

Description: Author(s): Bernhard M. Breid and James R. Anglin We develop a Hamiltonian that describes the time-dependent formation of a molecular Bose-Einstein condensate from a Bardeen-Cooper-Schrieffer state of fermionic atoms as a result of slowly sweeping through a Feshbach resonance. In contrast to many other calculations in the field, our Hamiltonian inc... [Phys. Rev. A 88, 033617] Published Mon Sep 16, 2013

Keywords: Matter waves and collective properties of cold atoms and molecules

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Combined effect of strain and defects on the conductance of graphene nanoribbons (2013)

Thomas Lehmann, Dmitry A. Ryndyk, and Gianaurelio Cuniberti

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-17

Description: Author(s): Thomas Lehmann, Dmitry A. Ryndyk, and Gianaurelio Cuniberti We investigate the combined influence of structural defects and uniaxial longitudinal strain on the electronic transport properties of armchair graphene nanoribbons using the numerical approach based on the semiempirical tight-binding model, the Landauer formalism, and the recursion method for Green... [Phys. Rev. B 88, 125420] Published Mon Sep 16, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Nematicity as a Probe of Superconducting Pairing in Iron-Based Superconductors (2013)

Rafael M. Fernandes and Andrew J. Millis

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-09-17

Description: Author(s): Rafael M. Fernandes and Andrew J. Millis In several families of iron-based superconducting materials, a d -wave pairing instability may compete with the leading s -wave instability. Here, we show that when both states have comparable free energies, superconducting and nematic degrees of freedom are strongly coupled. Whereas nematic order cau... [Phys. Rev. Lett. 111, 127001] Published Mon Sep 16, 2013

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Bulk-boundary correspondence for chiral symmetric quantum walks (2013)

János K. Asbóth and Hideaki Obuse

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-18

Description: Author(s): János K. Asbóth and Hideaki Obuse Discrete-time quantum walks (DTQW) have topological phases that are richer than those of time-independent lattice Hamiltonians. Even the basic symmetries, on which the standard classification of topological insulators hinges, have not yet been properly defined for quantum walks. We introduce the key... [Phys. Rev. B 88, 121406] Published Tue Sep 17, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Nanoscopic interferometer model for spin resonance in current noise (2013)

Anatoly Golub and Baruch Horovitz

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-18

Description: Author(s): Anatoly Golub and Baruch Horovitz We study a model for the observed phenomenon of electron spin resonance (ESR) at the Zeeman frequency as seen by a scanning tunneling microscope (STM) via its current noise. The model for this ESR-STM phenomenon allows the STM current to flow in two arms of a nanoscopic interferometer, one arm has d... [Phys. Rev. B 88, 115423] Published Tue Sep 17, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Peltier Cooling and Onsager Reciprocity in Ferromagnetic Thin Films (2013)

A. D. Avery and B. L. Zink

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-09-18

Description: Author(s): A. D. Avery and B. L. Zink We present direct measurements of the Peltier effect as a function of temperature from 77 to 325 K in Ni, Ni 80 Fe 20 , and Fe thin films made using a suspended Si-N membrane structure. Measurement of the Seebeck effect in the same films allows us to directly test predictions of Onsager reciprocity betw... [Phys. Rev. Lett. 111, 126602] Published Tue Sep 17, 2013

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Giant Magnetic Susceptibility of Gold Nanorods Detected by Magnetic Alignment (2013)

P. G. van Rhee, P. Zijlstra, T. G. A. Verhagen, J. Aarts, M. I. Katsnelson, J. C. Maan, M. Orrit, and P. C. M. Christianen

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-09-18

Description: Author(s): P. G. van Rhee, P. Zijlstra, T. G. A. Verhagen, J. Aarts, M. I. Katsnelson, J. C. Maan, M. Orrit, and P. C. M. Christianen We have determined the magnetic properties of single-crystalline Au nanorods in solution using an optically detected magnetic alignment technique. The rods exhibit a large anisotropy in the magnetic volume susceptibility ( Δ χ V ). Δ χ V increases with decreasing rod size and increasing aspect ratio and c... [Phys. Rev. Lett. 111, 127202] Published Tue Sep 17, 2013

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Local Conservation Laws and the Structure of the Many-Body Localized States (2013)

Maksym Serbyn, Z. Papić, and Dmitry A. Abanin

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-09-18

Description: Author(s): Maksym Serbyn, Z. Papić, and Dmitry A. Abanin We construct a complete set of local integrals of motion that characterize the many-body localized (MBL) phase. Our approach relies on the assumption that local perturbations act locally on the eigenstates in the MBL phase, which is supported by numerical simulations of the random-field X X Z spin cha... [Phys. Rev. Lett. 111, 127201] Published Tue Sep 17, 2013

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Fine structure of light-hole excitons in nanowire quantum dots (2013)

M. Zieliński

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-19

Description: Author(s): M. Zieliński Quantum dots with light-hole ground states could find numerous applications including faster quantum bit operations or coherent conversion of photons into electron spins. Typically, however, holes confined in epitaxial quantum dots are of heavy-hole character. I show, by use of atomistic tight-bindi... [Phys. Rev. B 88, 115424] Published Wed Sep 18, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Eigenfrequencies of the randomly pinned drum and conductivity of graphene (2013)

M. V. Medvedyeva and Ya. M. Blanter

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-19

Description: Author(s): M. V. Medvedyeva and Ya. M. Blanter Graphene is a convenient material for nanomechanical applications since high-frequency oscillations are easily accessible. In this article, we consider graphene on a rough substrate attached to imperfections at random locations. We explore the statistics of low-lying phonon modes, which exert most i... [Phys. Rev. B 88, 125423] Published Wed Sep 18, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Spin-Induced Optical Conductivity in the Spin-Liquid Candidate Herbertsmithite (2013)

D. V. Pilon, C. H. Lui, T. -H. Han, D. Shrekenhamer, A. J. Frenzel, W. J. Padilla, Y. S. Lee, and N. Gedik

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-09-19

Description: Author(s): D. V. Pilon, C. H. Lui, T. -H. Han, D. Shrekenhamer, A. J. Frenzel, W. J. Padilla, Y. S. Lee, and N. Gedik We report a direct measurement of the low-frequency optical conductivity of large-area single-crystal herbertsmithite, a promising spin-liquid candidate material, by means of terahertz time-domain spectroscopy. In the spectral range below 1.4 THz, we observe a contribution to the real part of the in... [Phys. Rev. Lett. 111, 127401] Published Wed Sep 18, 2013

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Derivative Discontinuity in the Strong-Interaction Limit of Density-Functional Theory (2013)

André Mirtschink, Michael Seidl, and Paola Gori-Giorgi

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-09-19

Description: Author(s): André Mirtschink, Michael Seidl, and Paola Gori-Giorgi We generalize the exact strong-interaction limit of the exchange-correlation energy of Kohn-Sham density functional theory to open systems with fluctuating particle numbers. When used in the self-consistent Kohn-Sham procedure on strongly interacting systems, this functional yields exact features cr... [Phys. Rev. Lett. 111, 126402] Published Wed Sep 18, 2013

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Detection and Measurement of Spin-Dependent Dynamics in Random Telegraph Signals (2013)

M. G. House, Ming Xiao, Guo; Ping Guo, Hai; Ou Li, Gang Cao, M. M. Rosenthal, and Hong; Wen Jiang

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-09-19

Description: Author(s): M. G. House, Ming Xiao, GuoPing Guo, HaiOu Li, Gang Cao, M. M. Rosenthal, and HongWen Jiang A quantum point contact was used to observe single-electron fluctuations of a quantum dot in a GaAs heterostructure. The resulting random telegraph signals (RTS) contain statistical information about the electron spin state if the tunneling dynamics are spin dependent. We develop a statistical metho... [Phys. Rev. Lett. 111, 126803] Published Wed Sep 18, 2013

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Coordination-driven magnetic-to-nonmagnetic transition in manganese-doped silicon clusters (2013)

V. Zamudio-Bayer, L. Leppert, K. Hirsch, A. Langenberg, J. Rittmann, M. Kossick, M. Vogel, R. Richter, A. Terasaki, T. Möller, B. v. Issendorff, S. Kümmel, and J. T. Lau

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-20

Description: Author(s): V. Zamudio-Bayer, L. Leppert, K. Hirsch, A. Langenberg, J. Rittmann, M. Kossick, M. Vogel, R. Richter, A. Terasaki, T. Möller, B. v. Issendorff, S. Kümmel, and J. T. Lau The interaction of a single manganese impurity with silicon is analyzed in a combined experimental and theoretical study of the electronic, magnetic, and structural properties of manganese-doped silicon clusters. The structural transition from exohedral to endohedral doping coincides with 3 d electro... [Phys. Rev. B 88, 115425] Published Thu Sep 19, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Correlation lengths of the repulsive one-dimensional Bose gas (2013)

Ovidiu I. Pâţu and Andreas Klümper

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-20

Description: Author(s): Ovidiu I. Pâţu and Andreas Klümper We investigate the large-distance asymptotic behavior of the static density-density and field-field correlation functions in the one-dimensional Bose gas at finite temperature. The asymptotic expansions of the Bose gas correlators are obtained performing a specific continuum limit in the similar low... [Phys. Rev. A 88, 033623] Published Thu Sep 19, 2013

Keywords: Matter waves and collective properties of cold atoms and molecules

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Electronic structure of graphene on a reconstructed Pt(100) surface: Hydrogen adsorption, doping, and band gaps (2013)

Søren Ulstrup, Louis Nilsson, Jill A. Miwa, Richard Balog, Marco Bianchi, Liv Hornekær, and Philip Hofmann

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-20

Description: Author(s): Søren Ulstrup, Louis Nilsson, Jill A. Miwa, Richard Balog, Marco Bianchi, Liv Hornekær, and Philip Hofmann We probe the structure and electronic band structure of graphene grown on a Pt(100) substrate using scanning tunneling microscopy, low energy electron diffraction, and angle-resolved photoemission spectroscopy. It is found that the graphene layer lacks a well-defined azimuthal orientation with respe... [Phys. Rev. B 88, 125425] Published Thu Sep 19, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Imaging the Three-Dimensional Fermi-Surface Pairing near the Hidden-Order Transition in URu_{2}Si_{2} Using Angle-Resolved Photoemission Spectroscopy (2013)

Jian-Qiao Meng, Peter M. Oppeneer, John A. Mydosh, Peter S. Riseborough, Krzysztof Gofryk, John J. Joyce, Eric D. Bauer, Yinwan Li, and Tomasz Durakiewicz

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-09-20

Description: Author(s): Jian-Qiao Meng, Peter M. Oppeneer, John A. Mydosh, Peter S. Riseborough, Krzysztof Gofryk, John J. Joyce, Eric D. Bauer, Yinwan Li, and Tomasz Durakiewicz We report angle-resolved photoemission spectroscopy experiments probing deep into the hidden-order state of URu 2 Si 2 , utilizing tunable photon energies with sufficient energy and momentum resolution to detect the near Fermi-surface (FS) behavior. Our results reveal (i) the full itinerancy of the 5 f e... [Phys. Rev. Lett. 111, 127002] Published Thu Sep 19, 2013

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Massive Symmetry Breaking in LaAlO_{3}/SrTiO_{3}(111) Quantum Wells: A Three-Orbital Strongly Correlated Generalization of Graphene (2013)

David Doennig, Warren E. Pickett, and Rossitza Pentcheva

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-09-20

Description: Author(s): David Doennig, Warren E. Pickett, and Rossitza Pentcheva Density functional theory calculations with an on-site Coulomb repulsion term reveal competing ground states in (111)-oriented (LaAlO 3 ) M /(SrTiO 3 ) N superlattices with n -type interfaces, ranging from spin, orbitally polarized (with selective e g ′ , a 1 g , or d x y occupation), Dirac point Fermi surface, to ... [Phys. Rev. Lett. 111, 126804] Published Thu Sep 19, 2013

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Circular Dichroism and Superdiffusive Transport at the Surface of BiTeI (2013)

J. Mauchain, Y. Ohtsubo, M. Hajlaoui, E. Papalazarou, M. Marsi, A. Taleb-Ibrahimi, J. Faure, K. A. Kokh, O. E. Tereshchenko, S. V. Eremeev, E. V. Chulkov, and L. Perfetti

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-09-20

Description: Author(s): J. Mauchain, Y. Ohtsubo, M. Hajlaoui, E. Papalazarou, M. Marsi, A. Taleb-Ibrahimi, J. Faure, K. A. Kokh, O. E. Tereshchenko, S. V. Eremeev, E. V. Chulkov, and L. Perfetti We investigate the electronic states of BiTeI after the optical pumping with circularly polarized photons. Our data show that photoexcited electrons reach an internal thermalization within 300 fs of the arrival of the pump pulse. Instead, the dichroic contrast generated by the circularly polarized l... [Phys. Rev. Lett. 111, 126603] Published Thu Sep 19, 2013

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Periodic Landau gauge and quantum Hall effect in twisted bilayer graphene (2013)

Yasumasa Hasegawa and Mahito Kohmoto

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-21

Description: Author(s): Yasumasa Hasegawa and Mahito Kohmoto Energy versus magnetic field (Hofstadter butterfly diagram) in twisted bilayer graphene is studied theoretically. If we take the usual Landau gauge, we cannot take a finite periodicity even when the magnetic flux through a supercell is a rational number. We show that the periodic Landau gauge, which... [Phys. Rev. B 88, 125426] Published Fri Sep 20, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Strong magnetoelectric coupling in multiferroic Co/BaTiO_{3} thin films (2013)

N. Jedrecy, H. J. von Bardeleben, V. Badjeck, D. Demaille, D. Stanescu, H. Magnan, and A. Barbier

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-24

Description: Author(s): N. Jedrecy, H. J. von Bardeleben, V. Badjeck, D. Demaille, D. Stanescu, H. Magnan, and A. Barbier We have found evidence for a strong magnetoelectric (ME) coupling at room temperature between polycrystalline Co layers (5−40 nm) and single-crystalline (001)-oriented BaTiO 3 layers (15−17 nm). We took advantage of the quasi-single polarization orientation, perpendicular to the film plane, of the fe... [Phys. Rev. B 88, 121409] Published Mon Sep 23, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Tight-binding model for exciton-polariton condensates in external potentials (2013)

Piotr Stępnicki and Michał Matuszewski

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-24

Description: Author(s): Piotr Stępnicki and Michał Matuszewski We propose a mean-field model to describe exciton-polariton condensates in deep periodic external potentials. We derive a set of coupled discrete equations for both condensed and uncondensed components, with interaction and tunneling coefficients obtained within the tight-binding approximation. We u... [Phys. Rev. A 88, 033626] Published Mon Sep 23, 2013

Keywords: Matter waves and collective properties of cold atoms and molecules

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Zero sound in a two-dimensional dipolar Fermi gas (2013)

Zhen-Kai Lu, S. I. Matveenko, and G. V. Shlyapnikov

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-24

Description: Author(s): Zhen-Kai Lu, S. I. Matveenko, and G. V. Shlyapnikov We study zero sound in a weakly interacting two-dimensional (2D) gas of single-component fermionic dipoles (polar molecules or atoms with a large magnetic moment) tilted with respect to the plane of their translational motion. It is shown that the propagation of zero sound is provided by both mean-f... [Phys. Rev. A 88, 033625] Published Mon Sep 23, 2013

Keywords: Matter waves and collective properties of cold atoms and molecules

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Scaling between Magnetic and Lattice Fluctuations in Iron Pnictide Superconductors (2013)

Rafael M. Fernandes, Anna E. Böhmer, Christoph Meingast, and Jörg Schmalian

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-09-25

Description: Author(s): Rafael M. Fernandes, Anna E. Böhmer, Christoph Meingast, and Jörg Schmalian The phase diagram of the iron arsenides is dominated by a magnetic and a structural phase transition, which need to be suppressed in order for superconductivity to appear. The proximity between the two transition temperature lines indicates correlation between these two phases, whose nature remains ... [Phys. Rev. Lett. 111, 137001] Published Tue Sep 24, 2013

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Large-Gap Quantum Spin Hall Insulators in Tin Films (2013)

Yong Xu, Binghai Yan, Hai-Jun Zhang, Jing Wang, Gang Xu, Peizhe Tang, Wenhui Duan, and Shou-Cheng Zhang

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-09-25

Description: Author(s): Yong Xu, Binghai Yan, Hai-Jun Zhang, Jing Wang, Gang Xu, Peizhe Tang, Wenhui Duan, and Shou-Cheng Zhang The search for large-gap quantum spin Hall (QSH) insulators and effective approaches to tune QSH states is important for both fundamental and practical interests. Based on first-principles calculations we find two-dimensional tin films are QSH insulators with sizable bulk gaps of 0.3 eV, sufficientl... [Phys. Rev. Lett. 111, 136804] Published Tue Sep 24, 2013

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Interplay of the Kondo Effect and Strong Spin-Orbit Coupling in Multihole Ultraclean Carbon Nanotubes (2013)

J. P. Cleuziou, N. G. N’Guyen, S. Florens, and W. Wernsdorfer

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-09-25

Description: Author(s): J. P. Cleuziou, N. G. N’Guyen, S. Florens, and W. Wernsdorfer We report on cotunneling spectroscopy magnetoconductance measurements of multihole ultraclean carbon nanotube quantum dots in the SU(4) Kondo regime with strong spin-orbit coupling. Successive shells show a gradual weakening of the Kondo effect with respect to the spin-orbital splittings, leading to... [Phys. Rev. Lett. 111, 136803] Published Tue Sep 24, 2013

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Majorana Fermions in Vortex Lattices (2013)

Rudro R. Biswas

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-09-26

Description: Author(s): Rudro R. Biswas We consider Majorana fermions tunneling among an array of vortices in a 2D chiral p -wave superconductor or equivalent material. The amplitude for Majorana fermions to tunnel between a pair of vortices is found to necessarily depend on the background superconducting phase profile; it is found to be p... [Phys. Rev. Lett. 111, 136401] Published Wed Sep 25, 2013

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Photoluminescence of Single-Walled Carbon Nanotubes: The Role of Stokes Shift and Impurity Levels (2013)

Jinglin Mu, Yuchen Ma, Huabing Yin, Chengbu Liu, and Michael Rohlfing

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-09-26

Description: Author(s): Jinglin Mu, Yuchen Ma, Huabing Yin, Chengbu Liu, and Michael Rohlfing Recent experiments have indicated that dopants and defects can trigger new redshifted photoluminescence (PL) peaks below the E 11 peak in single-walled carbon nanotubes (SWCNTs). To understand the origin of the new PL peaks, we study theoretically the excited-state properties of SWCNTs with some typi... [Phys. Rev. Lett. 111, 137401] Published Wed Sep 25, 2013

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Entanglement Detection from Conductance Measurements in Carbon Nanotube Cooper Pair Splitters (2013)

Bernd Braunecker, Pablo Burset, and Alfredo Levy Yeyati

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-09-26

Description: Author(s): Bernd Braunecker, Pablo Burset, and Alfredo Levy Yeyati Spin-orbit interaction provides a spin filtering effect in carbon nanotube based Cooper pair splitters that allows us to determine spin correlators directly from current measurements. The spin filtering axes are tunable by a global external magnetic field. By a bending of the nanotube, the filtering... [Phys. Rev. Lett. 111, 136806] Published Wed Sep 25, 2013

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Observation of Squeezing in the Electron Quantum Shot Noise of a Tunnel Junction (2013)

Gabriel Gasse, Christian Lupien, and Bertrand Reulet

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-09-26

Description: Author(s): Gabriel Gasse, Christian Lupien, and Bertrand Reulet We report the measurement of the fluctuations of the two quadratures of the electromagnetic field generated by a quantum conductor, a dc- and ac-biased tunnel junction placed at very low temperature. We observe that the variance of the fluctuations on one quadrature can go below that of vacuum, i.e.... [Phys. Rev. Lett. 111, 136601] Published Wed Sep 25, 2013

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Demixing in symmetric supersolid mixtures (2013)

Piyush Jain, Saverio Moroni, Massimo Boninsegni, and Lode Pollet

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-27

Description: Author(s): Piyush Jain, Saverio Moroni, Massimo Boninsegni, and Lode Pollet The droplet crystal phase of a symmetric binary mixture of soft-core bosons is studied by computer simulation. At high temperature each droplet comprises on average equal numbers of particles of either component, but the two components demix below the supersolid transition temperature, i.e., droplet... [Phys. Rev. A 88, 033628] Published Thu Sep 26, 2013

Keywords: Matter waves and collective properties of cold atoms and molecules

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Classification of spin-nematic squeezing in spin-1 collective atomic systems (2013)

Emi Yukawa, Masahito Ueda, and Kae Nemoto

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-27

Description: Author(s): Emi Yukawa, Masahito Ueda, and Kae Nemoto In spin-1 collective atomic systems, the spin and nematic-tensor operators constitute the su(3) Lie algebra, whose su(2) subalgebras are shown to give two distinct classes of squeezing which are unitarily equivalent to spin squeezing and spin-nematic squeezing. We explicitly construct a unitary oper... [Phys. Rev. A 88, 033629] Published Thu Sep 26, 2013

Keywords: Matter waves and collective properties of cold atoms and molecules

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Strain stabilization and thickness dependence of magnetism in epitaxial transition metal monosilicide thin films on Si(111) (2013)

Benjamin Geisler and Peter Kratzer

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-27

Description: Author(s): Benjamin Geisler and Peter Kratzer We present a comprehensive study of different 3 d transition metal monosilicides in their ground state crystal structure (B20), ranging from equilibrium bulk over biaxially strained bulk to epitaxial thin films on Si(111), by means of density functional theory. The magnetic properties of MnSi and FeS... [Phys. Rev. B 88, 115433] Published Thu Sep 26, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Effect of edge reconstruction and electron-electron interactions on quantum transport in graphene nanoribbons (2013)

S. Ihnatsenka and G. Kirczenow

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-27

Description: Author(s): S. Ihnatsenka and G. Kirczenow We present numerical studies of conduction in graphene nanoribbons with reconstructed edges based on the standard tight-binding model of the graphene and the extended Hückel model of the reconstructed defects. We performed atomic geometry relaxation of individual defects using density functional the... [Phys. Rev. B 88, 125430] Published Thu Sep 26, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Electron delocalization in gate-tunable gapless silicene (2013)

Yan-Yang Zhang, Wei-Feng Tsai, Kai Chang, X.-T. An, G.-P. Zhang, X.-C. Xie, and Shu-Shen Li

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-27

Description: Author(s): Yan-Yang Zhang, Wei-Feng Tsai, Kai Chang, X.-T. An, G.-P. Zhang, X.-C. Xie, and Shu-Shen Li The application of a perpendicular electric field can drive silicene into a gapless state, characterized by two nearly fully spin-polarized Dirac cones owing to both relatively large spin-orbital interactions and inversion symmetry breaking. Here we argue that since intervalley scattering from nonma... [Phys. Rev. B 88, 125431] Published Thu Sep 26, 2013

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Bonding, stability, and electronic properties of the BC_{3} honeycomb monolayer structure on NbB_{2}(0001) (2013)

Shi-Yu Liu, Shiyang Liu, De-Jun Li, Hongli Dang, Yingdi Liu, Sha Xue, Wenhua Xue, and Sanwu Wang

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-27

Description: Author(s): Shi-Yu Liu, Shiyang Liu, De-Jun Li, Hongli Dang, Yingdi Liu, Sha Xue, Wenhua Xue, and Sanwu Wang Two-dimensional graphenelike BC 3 honeycomb structures, which have been grown on the NbB 2 (0001) surface, possess intriguing properties that offer new opportunities for applications in nanoelectronics, mechanical materials, and superconductivity. The bonding configuration of BC 3 on the substrate has n... [Phys. Rev. B 88, 115434] Published Thu Sep 26, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Growth of Si ultrathin films on silver surfaces: Evidence of an Ag(110) reconstruction induced by Si (2013)

Romain Bernard, Thomas Leoni, Axel Wilson, Tony Lelaidier, Houda Sahaf, Eric Moyen, Loïc Assaud, Lionel Santinacci, Frédéric Leroy, Fabien Cheynis, Alain Ranguis, Haik Jamgotchian, Conrad Becker, Yves Borensztein, Margrit Hanbücken, Geoffroy Prévot, and Laurence Masson

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-27

Description: Author(s): Romain Bernard, Thomas Leoni, Axel Wilson, Tony Lelaidier, Houda Sahaf, Eric Moyen, Loïc Assaud, Lionel Santinacci, Frédéric Leroy, Fabien Cheynis, Alain Ranguis, Haik Jamgotchian, Conrad Becker, Yves Borensztein, Margrit Hanbücken, Geoffroy Prévot, and Laurence Masson We report here in situ measurements of the evolution of the Ag(110) surface during Si growth, using scanning tunneling microscopy and grazing incidence x-ray diffraction. We provide compelling evidence of an Ag(110) surface reconstruction associated with the release of Ag atoms induced by the growth... [Phys. Rev. B 88, 121411] Published Thu Sep 26, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Multispinon Continua at Zero and Finite Temperature in a Near-Ideal Heisenberg Chain (2013)

B. Lake, D. A. Tennant, J.-S. Caux, T. Barthel, U. Schollwöck, S. E. Nagler, and C. D. Frost

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-09-27

Description: Author(s): B. Lake, D. A. Tennant, J.-S. Caux, T. Barthel, U. Schollwöck, S. E. Nagler, and C. D. Frost The space-and time-dependent response of many-body quantum systems is the most informative aspect of their emergent behavior. The dynamical structure factor, experimentally measurable using neutron scattering, can map this response in wave vector and energy with great detail, allowing theories to be... [Phys. Rev. Lett. 111, 137205] Published Thu Sep 26, 2013

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Charge Qubit Coupled to an Intense Microwave Electromagnetic Field in a Superconducting Nb Device: Evidence for Photon-Assisted Quasiparticle Tunneling (2013)

S. E. de Graaf, J. Leppäkangas, A. Adamyan, A. V. Danilov, T. Lindström, M. Fogelström, T. Bauch, G. Johansson, and S. E. Kubatkin

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-09-27

Description: Author(s): S. E. de Graaf, J. Leppäkangas, A. Adamyan, A. V. Danilov, T. Lindström, M. Fogelström, T. Bauch, G. Johansson, and S. E. Kubatkin We study a superconducting charge qubit coupled to an intensive electromagnetic field and probe changes in the resonance frequency of the formed dressed states. At large driving strengths, exceeding the qubit energy-level splitting, this reveals the well known Landau-Zener-Stückelberg interference s... [Phys. Rev. Lett. 111, 137002] Published Thu Sep 26, 2013

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Chirality Dependence of the Absorption Cross Section of Carbon Nanotubes (2013)

Fabien Vialla, Cyrielle Roquelet, Benjamin Langlois, Géraud Delport, Silvia Morim Santos, Emmanuelle Deleporte, Philippe Roussignol, Claude Delalande, Christophe Voisin, and Jean-Sébastien Lauret

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-09-27

Description: Author(s): Fabien Vialla, Cyrielle Roquelet, Benjamin Langlois, Géraud Delport, Silvia Morim Santos, Emmanuelle Deleporte, Philippe Roussignol, Claude Delalande, Christophe Voisin, and Jean-Sébastien Lauret The variation of the optical absorption of carbon nanotubes with their geometry has been a long-standing question at the heart of both metrological and applicative issues, in particular because optical spectroscopy is one of the primary tools for the assessment of the chiral species abundance of sam... [Phys. Rev. Lett. 111, 137402] Published Thu Sep 26, 2013

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Quantized Conductance and Switching in Percolating Nanoparticle Films (2013)

Abdul Sattar, Shawn Fostner, and Simon A. Brown

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-09-27

Description: Author(s): Abdul Sattar, Shawn Fostner, and Simon A. Brown We demonstrate switching behavior and quantized conductance at room temperature in percolating films of nanoparticles. Our experiments and complementary simulations show that switching and quantization result from the formation of atomic-scale wires in the gaps between particles. These effects occur... [Phys. Rev. Lett. 111, 136808] Published Thu Sep 26, 2013

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Shot-Noise Signatures of Charge Fractionalization in the ν=2 Quantum Hall Edge (2013)

Mirco Milletarì and Bernd Rosenow

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-09-27

Description: Author(s): Mirco Milletarì and Bernd Rosenow We investigate the effect of interactions on shot noise in ν =2 quantum Hall edges, where a repulsive coupling between copropagating edge modes is expected to give rise to charge fractionalization. Using the method of nonequilibrium bosonization, we find that even asymptotically the edge distribution... [Phys. Rev. Lett. 111, 136807] Published Thu Sep 26, 2013

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Magnetization of SrCu_{2}(BO_{3})_{2} in Ultrahigh Magnetic Fields up to 118 T (2013)

Y. H. Matsuda, N. Abe, S. Takeyama, H. Kageyama, P. Corboz, A. Honecker, S. R. Manmana, G. R. Foltin, K. P. Schmidt, and F. Mila

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-09-27

Description: Author(s): Y. H. Matsuda, N. Abe, S. Takeyama, H. Kageyama, P. Corboz, A. Honecker, S. R. Manmana, G. R. Foltin, K. P. Schmidt, and F. Mila The magnetization process of the orthogonal-dimer antiferromagnet SrCu 2 (BO 3 ) 2 is investigated in high magnetic fields of up to 118 T. A 1/2 plateau is clearly observed in the field range 84 to 108 T in addition to 1/8, 1/4, and 1/3 plateaus at lower fields. Using a combination of state-of-the-art nu... [Phys. Rev. Lett. 111, 137204] Published Thu Sep 26, 2013

Keywords: Condensed Matter: Electronic Properties, etc.

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Fate of CP^{N-1} Fixed Points with q Monopoles (2013)

Matthew S. Block, Roger G. Melko, and Ribhu K. Kaul

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-09-27

Description: Author(s): Matthew S. Block, Roger G. Melko, and Ribhu K. Kaul We present an extensive quantum Monte Carlo study of the Néel to valence-bond solid (VBS) phase transition on rectangular- and honeycomb-lattice SU( N ) antiferromagnets in sign-problem-free models. We find that in contrast to the honeycomb lattice and previously studied square-lattice systems, on the... [Phys. Rev. Lett. 111, 137202] Published Thu Sep 26, 2013

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Evidence for Long-Range Spin Order Instead of a Peierls Transition in Si(553)-Au Chains (2013)

J. Aulbach, J. Schäfer, S. C. Erwin, S. Meyer, C. Loho, J. Settelein, and R. Claessen

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-09-27

Description: Author(s): J. Aulbach, J. Schäfer, S. C. Erwin, S. Meyer, C. Loho, J. Settelein, and R. Claessen Stabilization of the Si(553) surface by Au adsorption results in two different atomically defined chain types, one of Au atoms and one of Si. At low temperature these chains develop two- and threefold periodicity, respectively, previously attributed to Peierls instabilities. Here we report evidence ... [Phys. Rev. Lett. 111, 137203] Published Thu Sep 26, 2013

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Transverse spin diffusion in strongly interacting Fermi gases (2013)

Tilman Enss

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-28

Description: Author(s): Tilman Enss We compute spin diffusion in a dilute Fermi gas at arbitrary temperature, polarization, and strong interaction in the normal phase using kinetic theory. While the longitudinal spin diffusivity D ∥ depends weakly on polarization and diverges for small temperatures, the transverse spin diffusivity D ⊥ h... [Phys. Rev. A 88, 033630] Published Fri Sep 27, 2013

Keywords: Matter waves and collective properties of cold atoms and molecules

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Transport of spin anisotropy without spin currents (2013)

Michael Hell, Sourin Das, and Maarten R. Wegewijs

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-28

Description: Author(s): Michael Hell, Sourin Das, and Maarten R. Wegewijs We revisit the transport of spin-degrees of freedom across an electrically and thermally biased tunnel junction between two ferromagnets with noncollinear magnetizations. Besides the well-known charge current and spin current we show that a nonzero spin-quadrupole current flows between the ferromagn... [Phys. Rev. B 88, 115435] Published Fri Sep 27, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Probing the generalized magicity of Ag nanoclusters constructed on Si(111) by atomic manipulation (2013)

Fangfei Ming, Guohua Zhong, Qin Liu, Kedong Wang, Zhenyu Zhang, and Xudong Xiao

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-28

Description: Author(s): Fangfei Ming, Guohua Zhong, Qin Liu, Kedong Wang, Zhenyu Zhang, and Xudong Xiao Using scanning tunneling microscopy supplemented with first-principles calculations, we examine all the thermally activated atomistic processes of Ag n ( n = 1–26) constructed atom-by-atom on a Si(111)-(7×7) substrate, and we exploit such cluster dynamical information to further determine the energeti... [Phys. Rev. B 88, 125432] Published Fri Sep 27, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Magnetic and Kohn-Luttinger instabilities near a Van Hove singularity: Monolayer versus twisted bilayer graphene (2013)

J. González

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-28

Description: Author(s): J. González We investigate the many-body instabilities of electrons interacting near Van Hove singularities arising in monolayer and twisted bilayer graphene. We show that a pairing instability must be dominant over the tendency to magnetic order as the Fermi level is tuned to the Van Hove singularity in the co... [Phys. Rev. B 88, 125434] Published Fri Sep 27, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Moiré beatings in graphene on Ru(0001) (2013)

Marcella Iannuzzi, Irakli Kalichava, Haifeng Ma, Steven J. Leake, Haitao Zhou, Geng Li, Yi Zhang, Oliver Bunk, Hongjun Gao, Jürg Hutter, Philip R. Willmott, and Thomas Greber

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-28

Description: Author(s): Marcella Iannuzzi, Irakli Kalichava, Haifeng Ma, Steven J. Leake, Haitao Zhou, Geng Li, Yi Zhang, Oliver Bunk, Hongjun Gao, Jürg Hutter, Philip R. Willmott, and Thomas Greber The moiré superstructure of a single layer of carbon on ruthenium, where 25×25 graphene honeycombs sit on 23×23 substrate unit cells, is determined from first principles. The density functional theory (DFT) calculations predict two kinds of structural units, Ω and Y , in the supercell, which are iden... [Phys. Rev. B 88, 125433] Published Fri Sep 27, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Collective Spin Hall Effect for Electron-Hole Gratings (2013)

Ka Shen and G. Vignale

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-09-28

Description: Author(s): Ka Shen and G. Vignale We show that an electric field parallel to the wave fronts of an electron-hole grating in a GaAs quantum well generates, via the electronic spin Hall effect, a spin grating of the same wave vector and with an amplitude that can exceed 1% of the amplitude of the initial density grating. We refer to t... [Phys. Rev. Lett. 111, 136602] Published Fri Sep 27, 2013

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Self-consistent tight-binding description of Dirac points moving and merging in two-dimensional optical lattices (2013)

Julen Ibañez-Azpiroz, Asier Eiguren, Aitor Bergara, Giulio Pettini, and Michele Modugno

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-10-01

Description: Author(s): Julen Ibañez-Azpiroz, Asier Eiguren, Aitor Bergara, Giulio Pettini, and Michele Modugno We present an accurate ab initio tight-binding model, capable of describing the dynamics of Dirac points in tunable honeycomb optical lattices following a recent experimental realization [ Tarruell et al. Nature (London) 483 302 (2012) ]. Our scheme is based on first-principle maximally localized Wa... [Phys. Rev. A 88, 033631] Published Mon Sep 30, 2013

Keywords: Matter waves and collective properties of cold atoms and molecules

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Tunable omnidirectional strong light-matter interactions mediated by graphene surface plasmons (2013)

Feng Liu and Ertugrul Cubukcu

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-10-01

Description: Author(s): Feng Liu and Ertugrul Cubukcu In this theoretical work, we report on voltage-controllable hybridization of electromagnetic modes arising from strong interaction between graphene surface plasmons and molecular vibrations. The interaction strength depends strongly on the volume density of molecular dipoles, the molecular relaxatio... [Phys. Rev. B 88, 115439] Published Mon Sep 30, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Tight-binding couplings in microwave artificial graphene (2013)

Matthieu Bellec, Ulrich Kuhl, Gilles Montambaux, and Fabrice Mortessagne

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-10-01

Description: Author(s): Matthieu Bellec, Ulrich Kuhl, Gilles Montambaux, and Fabrice Mortessagne We experimentally study the propagation of microwaves in an artificial honeycomb lattice made of dielectric resonators. This evanescent propagation is well described by a tight-binding model, very much like the propagation of electrons in graphene. We measure the density of states, as well as the wa... [Phys. Rev. B 88, 115437] Published Mon Sep 30, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Dipole-induced localized plasmon modes and resonant surface plasmon scattering (2013)

E. G. Mishchenko

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-10-01

Description: Author(s): E. G. Mishchenko A metal film supports the continuum of propagating surface plasmon waves. The interaction of these waves with a dipole (nanoparticle) positioned some distance from the surface of the film can produce well-defined localized plasmon modes whose frequency nonetheless resides inside the continuum. This ... [Phys. Rev. B 88, 115436] Published Mon Sep 30, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Anisotropic Fermi contour of (001) GaAs electrons in parallel magnetic fields (2013)

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

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-10-01

Description: Author(s): D. Kamburov, M. A. Mueed, M. Shayegan, L. N. Pfeiffer, K. W. West, K. W. Baldwin, J. J. D. Lee, and R. Winkler We demonstrate a severe Fermi contour anisotropy induced by the application of a parallel magnetic field to high-mobility electrons confined to a 30-nm-wide (001) GaAs quantum well. We study commensurability oscillations, namely, geometrical resonances of the electron orbits with a unidirectional, s... [Phys. Rev. B 88, 125435] Published Mon Sep 30, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Excitons in nitride heterostructures: From zero- to one-dimensional behavior (2013)

D. Rosales, T. Bretagnon, B. Gil, A. Kahouli, J. Brault, B. Damilano, J. Massies, M. V. Durnev, and A. V. Kavokin

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-10-01

Description: Author(s): D. Rosales, T. Bretagnon, B. Gil, A. Kahouli, J. Brault, B. Damilano, J. Massies, M. V. Durnev, and A. V. Kavokin We report an unusual temperature dependence of exciton lifetimes in arrays of GaN nanostructures grown on semipolar (11-22) oriented Al 0.5 Ga 0.5 N alloy by molecular beam epitaxy. Atomic force microscopy measurements revealed: (i) a one-dimensional ordering tendency along the [1-100] crystallographic ... [Phys. Rev. B 88, 125437] Published Mon Sep 30, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Tuning electron transport through molecular junctions by chemical modification of the molecular core: First-principles study (2013)

Shigeru Tsukamoto, Vasile Caciuc, Nicolae Atodiresei, and Stefan Blügel

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-10-01

Description: Author(s): Shigeru Tsukamoto, Vasile Caciuc, Nicolae Atodiresei, and Stefan Blügel The unique versatility of the electronic structures of organic molecules can be potentially utilized to engineer single-molecular electronic devices with specific functionalities. Here, we report on how the electronic structures and the transport properties of molecular junctions containing a π -conj... [Phys. Rev. B 88, 125436] Published Mon Sep 30, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Metamaterial Transparency Induced by Cooperative Electromagnetic Interactions (2013)

Stewart D. Jenkins and Janne Ruostekoski

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-10-01

Description: Author(s): Stewart D. Jenkins and Janne Ruostekoski We propose a cooperative asymmetry-induced transparency, CAIT, formed by collective excitations in metamaterial arrays of discrete resonators. CAIT can display a sharp transmission resonance even when the constituent resonators individually exhibit broad resonances. We further show how dynamically r... [Phys. Rev. Lett. 111, 147401] Published Mon Sep 30, 2013

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Conductivity of Graphene with Resonant and Nonresonant Adsorbates (2013)

Guy Trambly de Laissardière and Didier Mayou

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-10-02

Description: Author(s): Guy Trambly de Laissardière and Didier Mayou We propose a unified description of transport in graphene with adsorbates that fully takes into account localization effects and loss of electronic coherence due to inelastic processes. We focus in particular on the role of the scattering properties of the adsorbates and analyze in detail cases with... [Phys. Rev. Lett. 111, 146601] Published Tue Oct 01, 2013

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Interplay between Classical Magnetic Moments and Superconductivity in Quantum One-Dimensional Conductors: Toward a Self-Sustained Topological Majorana Phase (2013)

Bernd Braunecker and Pascal Simon

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-10-02

Description: Author(s): Bernd Braunecker and Pascal Simon We study a one-dimensional interacting electronic liquid coupled to a 1D array of classical magnetic moments and to a superconductor. We show that at low energy and temperature the magnetic moments and the electrons become strongly entangled and that a magnetic spiral structure emerges. For strong e... [Phys. Rev. Lett. 111, 147202] Published Tue Oct 01, 2013

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Exciton-Polariton Gap Solitons in Two-Dimensional Lattices (2013)

E. A. Cerda-Méndez, D. Sarkar, D. N. Krizhanovskii, S. S. Gavrilov, K. Biermann, M. S. Skolnick, and P. V. Santos

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-10-03

Description: Author(s): E. A. Cerda-Méndez, D. Sarkar, D. N. Krizhanovskii, S. S. Gavrilov, K. Biermann, M. S. Skolnick, and P. V. Santos We report on the two-dimensional gap-soliton nature of exciton-polariton macroscopic coherent phases (PMCP) in a square lattice with a tunable amplitude. The resonantly excited PMCP forms close to the negative mass M point of the lattice band structure with energy within the lattice band gap and its... [Phys. Rev. Lett. 111, 146401] Published Wed Oct 02, 2013

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Quantum Transport in Magnetic Topological Insulator Thin Films (2013)

Hai-Zhou Lu, An Zhao, and Shun-Qing Shen

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-10-03

Description: Author(s): Hai-Zhou Lu, An Zhao, and Shun-Qing Shen The experimental observation of the long-sought quantum anomalous Hall effect was recently reported in magnetically doped topological insulator thin films [Chang et al. , Science 340 167 (2013) ]. An intriguing observation is a rapid decrease from the quantized plateau in the Hall conductance, accom... [Phys. Rev. Lett. 111, 146802] Published Wed Oct 02, 2013

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Engineering Topological Surface States: HgS, HgSe, and HgTe (2013)

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: 2013-10-03

Description: Author(s): François Virot, Roland Hayn, Manuel Richter, and Jeroen van den Brink Using density functional electronic structure calculations, we establish the consequences of surface termination and modification on protected surface states of metacinnabar ( β -HgS). Whereas we find that the Dirac cone is isotropic and well separated from the valence band for the (110) surface, it i... [Phys. Rev. Lett. 111, 146803] Published Wed Oct 02, 2013

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Fundamental Differences between Quantum Spin Hall Edge States at Zigzag and Armchair Terminations of Honeycomb and Ruby Nets (2013)

Laura Cano-Cortés, Carmine Ortix, and Jeroen van den Brink

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-10-03

Description: Author(s): Laura Cano-Cortés, Carmine Ortix, and Jeroen van den Brink Combining an analytical and numerical approach we investigate the dispersion of the topologically protected spin-filtered edge states of the quantum spin Hall state on honeycomb and ruby nets with zigzag (ZZ) and armchair (AC) edges. We show that the Fermi velocity of the helical edge states on ZZ e... [Phys. Rev. Lett. 111, 146801] Published Wed Oct 02, 2013

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Local Spin Relaxation within the Random Heisenberg Chain (2013)

J. Herbrych, J. Kokalj, and P. Prelovšek

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-10-03

Description: Author(s): J. Herbrych, J. Kokalj, and P. Prelovšek Finite-temperature local dynamical spin correlations S n n ( ω ) are studied numerically within the random spin-1/2 antiferromagnetic Heisenberg chain. The aim is to explain measured NMR spin-lattice relaxation times in BaCu 2 (Si 0.5 Ge 0.5 ) 2 O 7 , which is the realization of a random spin chain. In agreement w... [Phys. Rev. Lett. 111, 147203] Published Wed Oct 02, 2013

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Diffusing magnetic Tb impurities and magnetotransport in strongly spin-polarized Bi films (2013)

Sergii Sologub, Daniel Lükermann, Herbert Pfnür, and Christoph Tegenkamp

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-07

Description: Author(s): Sergii Sologub, Daniel Lükermann, Herbert Pfnür, and Christoph Tegenkamp As a contribution to electronic transport within strongly spin-polarized surface states and its modification by adsorption of magnetic impurities we studied the adsorption of Tb (atomic magnetic moment 10 μ B ) on epitaxial Bi(111) films by means of surface sensitive (magneto)conductance and low-energ... [Phys. Rev. B 88, 115412] Published Fri Sep 06, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Collective modes in the anisotropic unitary Fermi gas and the inclusion of a backflow term (2013)

L. Salasnich, P. Comaron, M. Zambon, and F. Toigo

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-10

Description: Author(s): L. Salasnich, P. Comaron, M. Zambon, and F. Toigo We study the collective modes of the confined unitary Fermi gas under anisotropic harmonic confinement as a function of the number of atoms. We use the equations of extended superfluid hydrodynamics, which take into account a dispersive von Weizsäcker-like term [ C. F. von Weizsäcker Z. Phys. 96 43... [Phys. Rev. A 88, 033610] Published Mon Sep 09, 2013

Keywords: Matter waves and collective properties of cold atoms and molecules

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Electronic and optical gap renormalization in carbon nanotubes near a metallic surface (2013)

Catalin D. Spataru

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-10

Description: Author(s): Catalin D. Spataru Renormalization of quasiparticles and excitons in carbon nanotubes (CNTs) near a metallic surface has been studied within a many-body formalism using an embedding approach newly implemented in the GW and Bethe-Salpeter methods. The quasiparticle band-gap renormalization in semiconducting CNTs is fou... [Phys. Rev. B 88, 125412] Published Mon Sep 09, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Quasiparticle interference on the surface of the topological crystalline insulator Pb_{1−x}Sn_{x}Se (2013)

A. Gyenis, I. K. Drozdov, S. Nadj-Perge, O. B. Jeong, J. Seo, I. Pletikosić, T. Valla, G. D. Gu, and A. Yazdani

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-10

Description: Author(s): A. Gyenis, I. K. Drozdov, S. Nadj-Perge, O. B. Jeong, J. Seo, I. Pletikosić, T. Valla, G. D. Gu, and A. Yazdani Topological crystalline insulators represent a novel topological phase of matter in which the surface states are protected by discrete point group symmetries of the underlying lattice. Rock-salt lead-tin-selenide alloy is one possible realization of this phase, which undergoes a topological phase tr... [Phys. Rev. B 88, 125414] Published Mon Sep 09, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Quantum Bicriticality in the Heavy-Fermion Metamagnet YbAgGe (2013)

Y. Tokiwa, M. Garst, P. Gegenwart, S. L. Bud’ko, and P. C. Canfield

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-09-10

Description: Author(s): Y. Tokiwa, M. Garst, P. Gegenwart, S. L. Bud’ko, and P. C. Canfield Bicritical points, at which two distinct symmetry-broken phases become simultaneously unstable, are typical for spin-flop metamagnetism. Interestingly, the heavy-fermion compound YbAgGe also possesses such a bicritical point (BCP) with a low temperature T BCP ≈0.3 K at a magnetic field of μ 0 H BCP ≈4.5 ... [Phys. Rev. Lett. 111, 116401] Published Mon Sep 09, 2013

Keywords: Condensed Matter: Electronic Properties, etc.

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Landau levels in lattices with long-range hopping (2013)

Hakan Atakişi and M. Ö. Oktel

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-11

Description: Author(s): Hakan Atakişi and M. Ö. Oktel Landau levels (LLs) are broadened in the presence of a periodic potential, forming a barrier for accurate simulation of the fractional quantum Hall effect using cold atoms in optical lattices. Recently, it has been shown that the degeneracy of the lowest Landau level (LLL) can be restored in a tight... [Phys. Rev. A 88, 033612] Published Tue Sep 10, 2013

Keywords: Matter waves and collective properties of cold atoms and molecules

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Hidden T-Linear Scattering Rate in Ba_{0.6}K_{0.4}Fe_{2}As_{2} Revealed by Optical Spectroscopy (2013)

Y. M. Dai, B. Xu, B. Shen, H. Xiao, H. H. Wen, X. G. Qiu, C. C. Homes, and R. P. S. M. Lobo

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-09-11

Description: Author(s): Y. M. Dai, B. Xu, B. Shen, H. Xiao, H. H. Wen, X. G. Qiu, C. C. Homes, and R. P. S. M. Lobo The optical properties of Ba 0.6 K 0.4 Fe 2 As 2 have been determined in the normal state for a number of temperatures over a wide frequency range. Two Drude terms, representing two groups of carriers with different scattering rates (1/ τ ), well describe the real part of the optical conductivity σ 1 ( ω ). A “b... [Phys. Rev. Lett. 111, 117001] Published Tue Sep 10, 2013

Keywords: Condensed Matter: Electronic Properties, etc.

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Engineering Correlation Effects via Artificially Designed Oxide Superlattices (2013)

Hanghui Chen, Andrew J. Millis, and Chris A. Marianetti

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-09-11

Description: Author(s): Hanghui Chen, Andrew J. Millis, and Chris A. Marianetti Ab initio calculations are used to predict that a superlattice composed of layers of LaTiO 3 and LaNiO 3 alternating along the [001] direction is a S =1 Mott insulator with large magnetic moments on the Ni sites, negligible moments on the Ti sites and a charge transfer gap set by the energy difference ... [Phys. Rev. Lett. 111, 116403] Published Tue Sep 10, 2013

Keywords: Condensed Matter: Electronic Properties, etc.

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Localized defect modes in graphene (2013)

Alexander V. Savin and Yuri S. Kivshar

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-12

Description: Author(s): Alexander V. Savin and Yuri S. Kivshar We study the properties of localized vibrational modes associated with structural defects in a sheet of graphene. For the examples of the Stone-Wales defects, one- and two-atom vacancies, many-atom linear vacancies, and adatoms in a honeycomb lattice, we demonstrate that the local defect modes are c... [Phys. Rev. B 88, 125417] Published Wed Sep 11, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Backscattering echo of correlated wave packets (2013)

Nicolas Cherroret and Dominique Delande

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-13

Description: Author(s): Nicolas Cherroret and Dominique Delande We present an analytical theory describing a phenomenon of enhanced backscattering corresponding to the spatial refocussing of a spreadout correlated wave packet due to a brief interaction with a disordered potential. Our theory is validated by numerical simulations and explains the physics observed... [Phys. Rev. A 88, 035602] Published Thu Sep 12, 2013

Keywords: Matter waves and collective properties of cold atoms and molecules

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Condensed Astatine: Monatomic and Metallic (2013)

Andreas Hermann, Roald Hoffmann, and N. W. Ashcroft

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-09-13

Description: Author(s): Andreas Hermann, Roald Hoffmann, and N. W. Ashcroft The condensed matter properties of the nominal terminating element of the halogen group with atomic number 85, astatine, are as yet unknown. In the intervening more than 70 years since its discovery significant advances have been made in substrate cooling and the other techniques necessary for the p... [Phys. Rev. Lett. 111, 116404] Published Thu Sep 12, 2013

Keywords: Condensed Matter: Electronic Properties, etc.

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Noninvasive manipulation of the optical response of opal photonic crystals (2013)

Sergei G. Romanov, Alois Regensburger, Alexander V. Korovin, Alexandra S. Romanova, and Ulf Peschel

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-14

Description: Author(s): Sergei G. Romanov, Alois Regensburger, Alexander V. Korovin, Alexandra S. Romanova, and Ulf Peschel The efficient manipulation with optical spectra of colloidal photonic crystals was achieved using the metal mirror positioned either immediately or at a distance from the crystal surface. If the mirror is close to the surface, the changes are mostly quantitative and relate to the improved light conf... [Phys. Rev. B 88, 125418] Published Fri Sep 13, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Roton-assisted chiral p-wave superfluid in a quasi-two-dimensional dipolar Bose-Fermi quantum-gas mixture (2013)

Ben Kain and Hong Y. Ling

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-17

Description: Author(s): Ben Kain and Hong Y. Ling The chiral p -wave ( p x ± i p y ) superfluid has attracted significant attention in recent years, mainly because its vortex core supports a Majorana fermion which, due to its non-Abelian statistics, can be explored for implementing topological quantum computation. Mixing dipolar bosons with fermions in qua... [Phys. Rev. A 88, 033616] Published Mon Sep 16, 2013

Keywords: Matter waves and collective properties of cold atoms and molecules

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Supersolid structure and excitation spectrum of soft-core bosons in three dimensions (2013)

Francesco Ancilotto, Maurizio Rossi, and Flavio Toigo

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-17

Description: Author(s): Francesco Ancilotto, Maurizio Rossi, and Flavio Toigo By means of a mean-field method, we have studied the zero-temperature structure and excitation spectrum of a three-dimensional soft-core bosonic system for a value of the interaction strength that favors a crystal structure made of atomic nanoclusters arranged with fcc ordering. In addition to the l... [Phys. Rev. A 88, 033618] Published Mon Sep 16, 2013

Keywords: Matter waves and collective properties of cold atoms and molecules

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Charge compensation by long-period reconstruction in strongly polar lithium niobate surfaces (2013)

S. Sanna, S. Rode, R. Hölscher, S. Klassen, C. Marutschke, K. Kobayashi, H. Yamada, W. G. Schmidt, and A. Kühnle

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-17

Description: Author(s): S. Sanna, S. Rode, R. Hölscher, S. Klassen, C. Marutschke, K. Kobayashi, H. Yamada, W. G. Schmidt, and A. Kühnle The microscopic structure of the polar (0001̅ ) and (0001) surfaces of lithium niobate is investigated by atomic-resolution frequency modulation atomic force microscopy and first-principles calculations. It is found that the surface reconstructs at annealing temperatures sufficiently high to ... [Phys. Rev. B 88, 115422] Published Mon Sep 16, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Impact of disorder on Dirac plasmon losses (2013)

Alessandro Principi, Giovanni Vignale, Matteo Carrega, and Marco Polini

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-17

Description: Author(s): Alessandro Principi, Giovanni Vignale, Matteo Carrega, and Marco Polini Recent scattering-type scanning near-field optical spectroscopy (s-SNOM) experiments on single-layer graphene have reported Dirac plasmon lifetimes that are substantially shorter than the dc transport scattering time τ tr . We argue that this discrepancy arises from the fact that the plasmon lifetime ... [Phys. Rev. B 88, 121405] Published Mon Sep 16, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Evidence of reduced surface electron-phonon scattering in the conduction band of Bi_{2}Se_{3} by nonequilibrium ARPES (2013)

A. Crepaldi, F. Cilento, B. Ressel, C. Cacho, J. C. Johannsen, M. Zacchigna, H. Berger, Ph. Bugnon, C. Grazioli, I. C. E. Turcu, E. Springate, K. Kern, M. Grioni, and F. Parmigiani

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-17

Description: Author(s): A. Crepaldi, F. Cilento, B. Ressel, C. Cacho, J. C. Johannsen, M. Zacchigna, H. Berger, Ph. Bugnon, C. Grazioli, I. C. E. Turcu, E. Springate, K. Kern, M. Grioni, and F. Parmigiani The nature of the Dirac quasiparticles in topological insulators calls for a direct investigation of the electron-phonon scattering at the surface . By comparing time-resolved ARPES measurements of the topological insulator Bi 2 Se 3 with different probing depths, we show that the relaxation dynamics of... [Phys. Rev. B 88, 121404] Published Mon Sep 16, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Interplay between energy dissipation and reservoir-induced thermalization in nonequilibrium quantum nanodevices (2013)

Fabrizio Dolcini, Rita Claudia Iotti, and Fausto Rossi

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-17

Description: Author(s): Fabrizio Dolcini, Rita Claudia Iotti, and Fausto Rossi A solid state electronic nanodevice is an intrinsically open quantum system, exchanging both energy with the host material and carriers with connected reservoirs. Its out-of-equilibrium behavior is determined by a nontrivial interplay between electronic dissipation and decoherence induced by inelast... [Phys. Rev. B 88, 115421] Published Mon Sep 16, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Momentum-dependent s-wave and d-wave interactions in atomic Bose-Einstein condensates (2013)

Moumita Gupta and Krishna Rai Dastidar

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-18

Description: Author(s): Moumita Gupta and Krishna Rai Dastidar We investigate the role of momentum-dependent interactions to determine the ground-state properties in the Bose-Einstein condensate for large scattering lengths ( a ) such that k a ≥1, even for small momentum ( p ) where p = ℏ k and k is the wave number. The results for momentum-dependent and momentum-indep... [Phys. Rev. A 88, 033619] Published Tue Sep 17, 2013

Keywords: Matter waves and collective properties of cold atoms and molecules

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Hierarchy of Fractional Chern Insulators and Competing Compressible States (2013)

A. M. Läuchli, Zhao Liu, E. J. Bergholtz, and R. Moessner

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-09-18

Description: Author(s): A. M. Läuchli, Zhao Liu, E. J. Bergholtz, and R. Moessner We study the phase diagram of interacting electrons in a dispersionless Chern band as a function of their filling. We find hierarchy multiplets of incompressible states at fillings ν =1/3, 2/5, 3/7, 4/9, 5/9, 4/7, 3/5 as well as ν =1/5, 2/7. These are accounted for by an analogy to Haldane pseudopoten... [Phys. Rev. Lett. 111, 126802] Published Tue Sep 17, 2013

Keywords: Condensed Matter: Electronic Properties, etc.

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Spin-Orbit Splitting in Single-Layer MoS_{2} Revealed by Triply Resonant Raman Scattering (2013)

Linfeng Sun, Jiaxu Yan, Da Zhan, Lei Liu, Hailong Hu, Hong Li, Ben Kang Tay, Jer-Lai Kuo, Chung-Che Huang, Daniel W. Hewak, Pooi See Lee, and Ze Xiang Shen

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-09-18

Description: Author(s): Linfeng Sun, Jiaxu Yan, Da Zhan, Lei Liu, Hailong Hu, Hong Li, Ben Kang Tay, Jer-Lai Kuo, Chung-Che Huang, Daniel W. Hewak, Pooi See Lee, and Ze Xiang Shen Although new spintronic devices based on the giant spin-orbit splitting of single-layer MoS 2 have been proposed, such splitting has not been studied effectively in experiments. This Letter reports the valence band spin-orbit splitting in single-layer MoS 2 for the first time, probed by the triply res... [Phys. Rev. Lett. 111, 126801] Published Tue Sep 17, 2013

Keywords: Condensed Matter: Electronic Properties, etc.

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Interaction of C_{60} with clean and hydrogenated SiC-(3×3) probed through the unoccupied electronic states (2013)

F. C. Bocquet, Y. Ksari, Y. P. Lin, L. Porte, and J.-M. Themlin

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-18

Description: Author(s): F. C. Bocquet, Y. Ksari, Y. P. Lin, L. Porte, and J.-M. Themlin The effect of hydrogenation on the conduction bands of the Si-rich 6 H -SiC(0001)-(3×3) reconstruction is studied using inverse photoemission spectroscopy in order to distinguish surface from bulk states. These results are exploited for the comparative study of the interaction of C 60 adsorbed on (3×3)... [Phys. Rev. B 88, 125421] Published Tue Sep 17, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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Hall Drag and Magnetodrag in Graphene (2013)

Justin C. W. Song and Leonid S. Levitov

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-09-18

Description: Author(s): Justin C. W. Song and Leonid S. Levitov Massless Dirac fermions in graphene at charge neutrality form a strongly interacting system in which both charged and neutral (energy) modes play an important role. These modes are essentially decoupled in the absence of a magnetic field, but become strongly coupled when the field is applied. We sho... [Phys. Rev. Lett. 111, 126601] Published Tue Sep 17, 2013

Keywords: Condensed Matter: Electronic Properties, etc.

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Quantum manipulation of valleys in bilayer graphene (2013)

G. Y. Wu, N.-Y. Lue, and Y.-C. Chen

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-19

Description: Author(s): G. Y. Wu, N.-Y. Lue, and Y.-C. Chen The valley pseudospin is an inherent electron degree of freedom in graphene. This work establishes a theory for manipulation of valley pseudospins at the quantum level, in bilayer graphene. Two key mechanisms of valley manipulation are proposed and valley-based quantum devices—qubits and field-effec... [Phys. Rev. B 88, 125422] Published Wed Sep 18, 2013

Keywords: Surface physics, nanoscale physics, low-dimensional systems

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