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Electronic and structural characterization of divacancies in irradiated graphene (2012)

Miguel M. Ugeda, Iván Brihuega, Fanny Hiebel, Pierre Mallet, Jean-Yves Veuillen, José M. Gómez-Rodríguez, and Félix Ynduráin

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-09

Description: Author(s): Miguel M. Ugeda, Iván Brihuega, Fanny Hiebel, Pierre Mallet, Jean-Yves Veuillen, José M. Gómez-Rodríguez, and Félix Ynduráin We provide a thorough study of a carbon divacancy, a point defect expected to have a large impact on the properties of graphene. Low-temperature scanning tunneling microscopy imaging of irradiated graphene on different substrates enabled us to identify a common twofold symmetry point defect. Our fir... [Phys. Rev. B 85, 121402] Published Thu Mar 08, 2012

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

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Graphing and grafting graphene: Classifying finite topological defects (2012)

Eric Cockayne

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-09

Description: Author(s): Eric Cockayne The structure of finite-area topological defects in graphene is described in terms of both the direct honeycomb lattice and its dual triangular lattice. Such defects are equivalent to cutting out a patch of graphene and replacing it with a different patch with the same number of dangling bonds. An i... [Phys. Rev. B 85, 125409] Published Thu Mar 08, 2012

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

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Low-density molecular gas of tightly bound Rashba-Dresselhaus fermions (2012)

So Takei, Chien-Hung Lin, Brandon M. Anderson, and Victor Galitski

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-22

Description: Author(s): So Takei, Chien-Hung Lin, Brandon M. Anderson, and Victor Galitski We study interacting Rashba-Dresselhaus fermions in two spatial dimensions. First, we present an exact solution to the two-particle bound-state problem of spin-orbit (SO)-coupled fermions for arbitrary Rashba and Dresselhaus SO interactions. An exact molecular-wave function and the Green's function ... [Phys. Rev. A 85, 023626] Published Tue Feb 21, 2012

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

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Optimized confinement of fermions in two dimensions (2012)

J. D. Cone, S. Chiesa, V. R. Rousseau, G. G. Batrouni, and R. T. Scalettar

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-02-22

Description: Author(s): J. D. Cone, S. Chiesa, V. R. Rousseau, G. G. Batrouni, and R. T. Scalettar One of the challenging features of studying model Hamiltonians with cold atoms in optical lattices is the presence of spatial inhomogeneities induced by the confining potential, which results in the coexistence of different phases.This paper presents quantum Monte Carlo results comparing methods for... [Phys. Rev. B 85, 075418] Published Tue Feb 21, 2012

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

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Near-field spectroscopy of silicon dioxide thin films (2012)

L. M. Zhang, G. O. Andreev, Z. Fei, A. S. McLeod, G. Dominguez, M. Thiemens, A. H. Castro-Neto, D. N. Basov, and M. M. Fogler

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-02-22

Description: Author(s): L. M. Zhang, G. O. Andreev, Z. Fei, A. S. McLeod, G. Dominguez, M. Thiemens, A. H. Castro-Neto, D. N. Basov, and M. M. Fogler We analyze the results of scanning near-field infrared spectroscopy performed on thin films of a-SiO 2 on Si substrate. The measured near-field signal exhibits surface-phonon resonances whose strength has a prominent thickness dependence in the range from 2 to 300 nm . These observations are compared ... [Phys. Rev. B 85, 075419] Published Tue Feb 21, 2012

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

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Surface plasmon enhanced absorption and suppressed transmission in periodic arrays of graphene ribbons (2012)

A. Yu. Nikitin, F. Guinea, F. J. Garcia-Vidal, and L. Martin-Moreno

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-02-22

Description: Author(s): A. Yu. Nikitin, F. Guinea, F. J. Garcia-Vidal, and L. Martin-Moreno Resonance diffraction in the periodic array of graphene microribbons is theoretically studied following a recent experiment [ L. Ju et al. Nature Nanotech. 6 630 (2011) ]. Systematic studies over a wide range of parameters are presented. It is shown that a much richer resonant picture would be obser... [Phys. Rev. B 85, 081405] Published Tue Feb 21, 2012

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

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Multiparticle pseudopotentials for multicomponent quantum Hall systems (2012)

Simon C. Davenport and Steven H. Simon

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-02-25

Description: Author(s): Simon C. Davenport and Steven H. Simon The Haldane pseudopotential construction has been an extremely powerful concept in quantum Hall physics—it not only gives a minimal description of the space of Hamiltonians but also suggests special model Hamiltonians (those where certain pseudopotential are set to zero) that may have exactly solvab... [Phys. Rev. B 85, 075430] Published Fri Feb 24, 2012

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

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Phase transitions in dipolar gases in optical lattices (2012)

Y. Sherkunov, Vadim V. Cheianov, and Vladimir Fal'ko

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-25

Description: Author(s): Y. Sherkunov, Vadim V. Cheianov, and Vladimir Fal'ko We investigate the phase diagrams of two-dimensional lattice dipole systems with variable geometry. For bipartite square and triangular lattices with tunable vertical sublattice separation, we find rich phase diagrams featuring a sequence of easy-plane magnetically ordered phases separated by incomm... [Phys. Rev. A 85, 025603] Published Fri Feb 24, 2012

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

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Multiphonon relaxation of moderately excited carriers in Si/SiO_{2} nanocrystals (2012)

A. S. Moskalenko, J. Berakdar, A. N. Poddubny, A. A. Prokofiev, I. N. Yassievich, and S. V. Goupalov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-02-25

Description: Author(s): A. S. Moskalenko, J. Berakdar, A. N. Poddubny, A. A. Prokofiev, I. N. Yassievich, and S. V. Goupalov We study the phonon-assisted intraband relaxation of electrons and holes confined in Si nanocrystals. The rates of relaxation processes are calculated as functions of the nanocrystal size and of the temperature. It occurs that the main contribution to the relaxation is provided by the mechanism wher... [Phys. Rev. B 85, 085432] Published Fri Feb 24, 2012

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

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Optimized maximum-confidence discrimination of N mixed quantum states and application to symmetric states (2012)

Ulrike Herzog

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-13

Description: Author(s): Ulrike Herzog We study an optimized measurement which discriminates N mixed quantum states occurring with given prior probabilities. The measurement yields the maximum achievable confidence for each of the N conclusive outcomes, thereby keeping the overall probability of inconclusive outcomes as small as possible... [Phys. Rev. A 85, 032312] Published Mon Mar 12, 2012

Keywords: Quantum information

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Ferromagnetic transition of a two-component Fermi gas of hard spheres (2012)

F. Arias de Saavedra, F. Mazzanti, J. Boronat, and A. Polls

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-13

Description: Author(s): F. Arias de Saavedra, F. Mazzanti, J. Boronat, and A. Polls We use microscopic many-body theory to analyze the problem of itinerant ferromagnetism in a repulsive atomic Fermi gas of hard spheres. Using simple arguments we show that the available theoretical predictions for the onset of the ferromagnetic transition predict a transition point at a density ( k F a ... [Phys. Rev. A 85, 033615] Published Mon Mar 12, 2012

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

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First-principles theoretical investigation of monoatomic and dimer Mn adsorption on noble metal (111) surfaces (2012)

Francisco Muñoz, Aldo H. Romero, Jose Mejía-López, and J. L. Morán-López

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-13

Description: Author(s): Francisco Muñoz, Aldo H. Romero, Jose Mejía-López, and J. L. Morán-López A theoretical investigation of the adsorption of Mn single atoms and dimers on the (111) surface of Cu, Ag, and Au, within the framework of the density functional theory, is presented. First, the bulk and the clean (111) surface electronic structures are calculated, with results that agree well with... [Phys. Rev. B 85, 115417] Published Mon Mar 12, 2012

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

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Optical phonon modes in ordered core-shell CdSe/CdS nanorod arrays (2012)

Andrea Giugni, Gobind Das, Alessandro Alabastri, Remo Proietti Zaccaria, Marco Zanella, Isabella Franchini, Enzo Di Fabrizio, and Roman Krahne

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-13

Description: Author(s): Andrea Giugni, Gobind Das, Alessandro Alabastri, Remo Proietti Zaccaria, Marco Zanella, Isabella Franchini, Enzo Di Fabrizio, and Roman Krahne We investigate the optical phonons in “dot-in-a-rod” core–shell CdSe/CdS nanorods at wavelengths resonant with the optical transitions either in the core or in the shell. At a wavelength above the CdS band gap, only CdS phonon modes were detected. In contrast, at excitation in resonance with the cor... [Phys. Rev. B 85, 115413] Published Mon Mar 12, 2012

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

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Magnetophonon resonance in graphite: High-field Raman measurements and electron-phonon coupling contributions (2012)

Y. Kim, Y. Ma, A. Imambekov, N. G. Kalugin, A. Lombardo, A. C. Ferrari, J. Kono, and D. Smirnov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-13

Description: Author(s): Y. Kim, Y. Ma, A. Imambekov, N. G. Kalugin, A. Lombardo, A. C. Ferrari, J. Kono, and D. Smirnov We perform Raman scattering experiments on natural graphite in magnetic fields up to 45 T, observing a series of peaks due to interband electronic excitations over a much broader magnetic field range than previously reported. We also explore electron-phonon coupling in graphite via magnetophonon res... [Phys. Rev. B 85, 121403] Published Mon Mar 12, 2012

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

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Charge fluctuations in single-electron tunneling oscillations (2012)

C. Negri and F. Pistolesi

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-13

Description: Author(s): C. Negri and F. Pistolesi It has been predicted that in the presence of a sufficiently high dissipative environment transport in a small tunnel junction can become extremely regular, giving rise to the phenomenon of single-electron tunneling oscillations. Recent progress in detection of high-frequency current fluctuations an... [Phys. Rev. B 85, 115416] Published Mon Mar 12, 2012

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

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Smooth gauge for topological insulators (2012)

Alexey A. Soluyanov and David Vanderbilt

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-13

Description: Author(s): Alexey A. Soluyanov and David Vanderbilt We develop a technique for constructing Bloch-like functions for 2D Z 2 insulators (i.e., quantum spin-Hall insulators) that are smooth functions of k on the entire Brillouin-zone torus. As the initial step, the occupied subspace of the insulator is decomposed into a direct sum of two “Chern bands,” ... [Phys. Rev. B 85, 115415] Published Mon Mar 12, 2012

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

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Quantum key distribution with delayed privacy amplification and its application to the security proof of a two-way deterministic protocol (2012)

Chi-Hang Fred Fung, Xiongfeng Ma, H. F. Chau, and Qing-yu Cai

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-10

Description: Author(s): Chi-Hang Fred Fung, Xiongfeng Ma, H. F. Chau, and Qing-yu Cai Privacy amplification (PA) is an essential postprocessing step in quantum key distribution (QKD) for removing any information an eavesdropper may have on the final secret key. In this paper, we consider delaying PA of the final key after its use in one-time pad encryption and prove its security. We ... [Phys. Rev. A 85, 032308] Published Fri Mar 09, 2012

Keywords: Quantum information

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Quantum repeaters based on heralded qubit amplifiers (2012)

Jiří Minář, Hugues de Riedmatten, and Nicolas Sangouard

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-14

Description: Author(s): Jiří Minář, Hugues de Riedmatten, and Nicolas Sangouard We present a quantum repeater scheme based on the recently proposed qubit amplifier [ N. Gisin, S. Pironio and N. Sangouard Phys. Rev. Lett. 105 070501 (2010) ]. It relies on an on-demand entangled-photon-pair source which uses on-demand single-photon sources, linear optical elements, and atomic ens... [Phys. Rev. A 85, 032313] Published Tue Mar 13, 2012

Keywords: Quantum information

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Disorder effects on the quantum coherence of a many-boson system (2012)

Zhi-Hai Zhang, Pei Lu, Shiping Feng, and Shi-Jie Yang

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-14

Description: Author(s): Zhi-Hai Zhang, Pei Lu, Shiping Feng, and Shi-Jie Yang The effects of disorder on the quantum coherence for many-boson systems are studied in a double-well model. For the ground state, the disorder enhances the quantum coherence. In the deep Mott regime, dynamical evolution reveals periodical collapses and revivals of the quantum coherence, which is rob... [Phys. Rev. A 85, 033617] Published Tue Mar 13, 2012

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

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Surface properties of the clean and Au/Pd covered Fe_{3}O_{4}(111): DFT andDFT+U study (2012)

Adam Kiejna, Tomasz Ossowski, and Tomasz Pabisiak

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-14

Description: Author(s): Adam Kiejna, Tomasz Ossowski, and Tomasz Pabisiak The spin-density-functional theory (DFT) and DFT+ U with the Hubbard U term accounting for on-site Coulomb interactions were applied to investigate structure, stability, and electronic properties of different terminations of the Fe 3 O 4 (111) surface. All terminations of the ferrimagnetic Fe 3 O 4 (111) sur... [Phys. Rev. B 85, 125414] Published Tue Mar 13, 2012

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

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Phase transitions for random states and a semicircle law for the partial transpose (2012)

Guillaume Aubrun, Stanisław J. Szarek, and Deping Ye

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-13

Description: Author(s): Guillaume Aubrun, Stanisław J. Szarek, and Deping Ye For a system of N identical particles in a random pure state, there is a threshold k 0 = k 0 ( N )∼ N /5 such that two subsystems of k particles each typically share entanglement if k 〉 k 0 , and typically do not share entanglement if k 〈 k 0 . By “random” we mean here uniformly distributed on the sphere of th... [Phys. Rev. A 85, 030302] Published Mon Mar 12, 2012

Keywords: Quantum information

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Barycentric measure of quantum entanglement (2012)

Wojciech Ganczarek, Marek Kuś, and Karol Życzkowski

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-15

Description: Author(s): Wojciech Ganczarek, Marek Kuś, and Karol Życzkowski Majorana representation of quantum states by a constellation of n “stars” (points on the sphere) can be used to describe any pure state of a simple system of dimension n +1 or a permutation symmetric pure state of a composite system consisting of n qubits. We analyze the variance of the distribution ... [Phys. Rev. A 85, 032314] Published Wed Mar 14, 2012

Keywords: Quantum information

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Completeness of classical φ^{4} theory on two-dimensional lattices (2012)

Vahid Karimipour and Mohammad Hossein Zarei

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-15

Description: Author(s): Vahid Karimipour and Mohammad Hossein Zarei We formulate a quantum formalism for the statistical mechanical models of discretized field theories on lattices and then show that the discrete version of φ 4 theory on 2D square lattice is complete in the sense that the partition function of any other discretized scalar field theory on an arbitrary... [Phys. Rev. A 85, 032316] Published Wed Mar 14, 2012

Keywords: Quantum information

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Symmetry classification of energy bands in graphene (2012)

E. Kogan and V. U. Nazarov

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-15

Description: Author(s): E. Kogan and V. U. Nazarov We present the results of the first-principle calculations of the energy bands in graphene and their symmetry classification. The valence bands and four lowest conduction bands are classified according to their symmetry at points Γ and K . Merging of the bands is interpreted in the framework of the g... [Phys. Rev. B 85, 115418] Published Wed Mar 14, 2012

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

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Resonant Rayleigh scattering as a probe of spin polarization in a two-dimensional electron system (2012)

L. V. Kulik, K. Ovchinnikov, A. S. Zhuravlev, V. E. Bisti, I. V. Kukushkin, S. Schmult, and W. Dietsche

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-15

Description: Author(s): L. V. Kulik, K. Ovchinnikov, A. S. Zhuravlev, V. E. Bisti, I. V. Kukushkin, S. Schmult, and W. Dietsche We investigated the resonant Rayleigh scattering in a two-dimensional electron system (2DES) and developed a differential technique for obtaining high-quality RRS spectra. Oscillations of the RRS scattering efficiency are observed. The oscillations are explained in terms of redistribution of electro... [Phys. Rev. B 85, 113403] Published Wed Mar 14, 2012

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

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Birefringent nanostructured composite materials (2012)

Bernardo S. Mendoza and W. Luis Mochán

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-15

Description: Author(s): Bernardo S. Mendoza and W. Luis Mochán We use a very efficient recursive method to calculate the effective optical response of materials made up of arbitrarily shaped dielectric inclusions arranged in periodic 2D arrays within a metal matrix with a lattice constant much smaller than the wavelength of the incident light, so that we may ne... [Phys. Rev. B 85, 125418] Published Wed Mar 14, 2012

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

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Direct experimental determination of the K 2p and Cl 2p core-level binding energy shifts between molecular and solid KCl: Line broadening effects (2012)

M. Patanen, G. M. Bancroft, S. Aksela, and H. Aksela

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-15

Description: Author(s): M. Patanen, G. M. Bancroft, S. Aksela, and H. Aksela Using a technique used previously for metals, the K 2 p and Cl 2 p photoelectron spectra of KCl have been measured from the molecular vapor and nonconductor solid simultaneously —a direct measurement for a nonconductor. The Cl 2 p core level in bulk-solid KCl has a 0.79-eV larger binding energy than its... [Phys. Rev. B 85, 125419] Published Wed Mar 14, 2012

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

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Algorithmic approach to simulate Hamiltonian dynamics and an NMR simulation of quantum state transfer (2012)

Ashok Ajoy, Rama Koteswara Rao, Anil Kumar, and Pranaw Rungta

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-15

Description: Author(s): Ashok Ajoy, Rama Koteswara Rao, Anil Kumar, and Pranaw Rungta We propose an iterative algorithm to simulate the dynamics generated by any n -qubit Hamiltonian. The simulation entails decomposing the unitary time evolution operator U (unitary) into a product of different time-step unitaries. The algorithm product-decomposes U in a chosen operator basis by identi... [Phys. Rev. A 85, 030303] Published Wed Mar 14, 2012

Keywords: Quantum information

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Thermally generated long-lived quantum correlations for two atoms trapped in fiber-coupled cavities (2012)

Vitalie Eremeev, Víctor Montenegro, and Miguel Orszag

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-15

Description: Author(s): Vitalie Eremeev, Víctor Montenegro, and Miguel Orszag A theoretical model for driving a two-qubit system to a stable long-lived entanglement is discussed. The entire system is represented by two atoms, initially in ground states and disentangled, each one coupled to a separate cavity with the cavities connected by a fiber. The cavities and fiber exchan... [Phys. Rev. A 85, 032315] Published Wed Mar 14, 2012

Keywords: Quantum information

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Dipolar Bose-Einstein condensates with large scattering length (2012)

Luis E. Young-S, S. K. Adhikari, and P. Muruganandam

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-15

Description: Author(s): Luis E. Young-S, S. K. Adhikari, and P. Muruganandam A uniform dilute Bose gas of known density has a universal behavior as the atomic scattering length tends to infinity at unitarity while most of its properties are determined by a universal parameter ξ relating the energies of the noninteracting and unitary gases. The usual mean-field equation is no... [Phys. Rev. A 85, 033619] Published Wed Mar 14, 2012

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

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Electron localization in epitaxial graphene on Ru(0001) determined by moiré corrugation (2012)

D. Stradi, S. Barja, C. Díaz, M. Garnica, B. Borca, J. J. Hinarejos, D. Sánchez-Portal, M. Alcamí, A. Arnau, A. L. Vázquez de Parga, R. Miranda, and F. Martín

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-15

Description: Author(s): D. Stradi, S. Barja, C. Díaz, M. Garnica, B. Borca, J. J. Hinarejos, D. Sánchez-Portal, M. Alcamí, A. Arnau, A. L. Vázquez de Parga, R. Miranda, and F. Martín The interpretation of scanning tunneling spectroscopy (STS) and scanning tunneling microscopy measurements of epitaxial graphene on lattice-mismatched substrates is a challenging problem, because of the spatial modulation in the electronic structure imposed by the formation of a moiré pattern. Here ... [Phys. Rev. B 85, 121404] Published Wed Mar 14, 2012

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

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Growth and decay of hcp-like Cu hut-shaped structures on W(100) (2012)

Tjeerd R. J. Bollmann, Raoul van Gastel, Herbert Wormeester, Harold J. W. Zandvliet, and Bene Poelsema

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-15

Description: Author(s): Tjeerd R. J. Bollmann, Raoul van Gastel, Herbert Wormeester, Harold J. W. Zandvliet, and Bene Poelsema We have studied both the morphology and structure of thin Cu deposits on W(100) during growth and desorption, using low-energy electron microscopy (LEEM) and selective area low-energy electron diffraction ( μ LEED). During growth at 674 K hut-shaped Cu crystallites with steep facets ( 〉 54 ∘ ) coexist... [Phys. Rev. B 85, 125417] Published Wed Mar 14, 2012

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

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Mapping the Berry curvature from semiclassical dynamics in optical lattices (2012)

H. M. Price and N. R. Cooper

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-16

Description: Author(s): H. M. Price and N. R. Cooper We propose a general method by which experiments on ultracold gases can be used to determine the topological properties of the energy bands of optical lattices, as represented by the map of the Berry curvature across the Brillouin zone. The Berry curvature modifies the semiclassical dynamics and hen... [Phys. Rev. A 85, 033620] Published Thu Mar 15, 2012

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

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Low-rank positive-partial-transpose states and their relation to product vectors (2012)

Leif Ove Hansen, Andreas Hauge, Jan Myrheim, and Per Øyvind Sollid

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-07

Description: Author(s): Leif Ove Hansen, Andreas Hauge, Jan Myrheim, and Per Øyvind Sollid Deciding whether a mixed quantum state is separable or entangled is a difficult problem in general. Separable states are positive under partial transposition [they are positive-partial-transpose (PPT) states], but this simple test does not exclude all entangled states. In order to understand the ent... [Phys. Rev. A 85, 022309] Published Mon Feb 06, 2012

Keywords: Quantum information

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Dissipation-induced squeezing (2012)

Gentaro Watanabe and Harri Mäkelä

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-07

Description: Author(s): Gentaro Watanabe and Harri Mäkelä We present a method for phase and number squeezing in two-mode Bose systems using dissipation. The effectiveness of this method is demonstrated by considering cold Bose gases trapped in a double-well potential. The extension of our formalism to an optical lattice gives control of the phase boundarie... [Phys. Rev. A 85, 023604] Published Mon Feb 06, 2012

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

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Phase diagram of Landau-Zener phenomena in coupled one-dimensional Bose quantum fluids (2012)

Santiago F. Caballero-Benítez and Rosario Paredes

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-07

Description: Author(s): Santiago F. Caballero-Benítez and Rosario Paredes We study stationary and dynamical properties of the many-body Landau-Zener dynamics of a Bose quantum fluid confined in two coupled one-dimensional chains by using a many-body generalization recently reported Chen et al. [ Nature Phys. 7 61 (2011) ], within the decoupling approximation and the one-l... [Phys. Rev. A 85, 023605] Published Mon Feb 06, 2012

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

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High-fidelity quantum gates in the presence of dispersion (2012)

B. Khani, S. T. Merkel, F. Motzoi, Jay M. Gambetta, and F. K. Wilhelm

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-07

Description: Author(s): B. Khani, S. T. Merkel, F. Motzoi, Jay M. Gambetta, and F. K. Wilhelm We numerically demonstrate the control of motional degrees of freedom of an ensemble of neutral atoms in an optical lattice with a shallow trapping potential. Taking into account the range of quasimomenta across different Brillouin zones results in an ensemble whose members effectively have inhomoge... [Phys. Rev. A 85, 022306] Published Mon Feb 06, 2012

Keywords: Quantum information

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Back-action of a driven nonlinear resonator on a superconducting qubit (2012)

Maxime Boissonneault, A. C. Doherty, F. R. Ong, P. Bertet, D. Vion, D. Esteve, and A. Blais

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-05

Description: Author(s): Maxime Boissonneault, A. C. Doherty, F. R. Ong, P. Bertet, D. Vion, D. Esteve, and A. Blais We study the backaction of a driven nonlinear resonator on a multilevel superconducting qubit. Using unitary transformations on the multilevel Jaynes-Cummings Hamiltonian and quantum optics master equation, we derive an analytical model that goes beyond linear response theory. Within the limits of v... [Phys. Rev. A 85, 022305] Published Fri Feb 03, 2012

Keywords: Quantum information

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Finite-length charge-density waves on terminated atomic wires (2012)

Jin Sung Shin, Kyung-Deuk Ryang, and Han Woong Yeom

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-02-05

Description: Author(s): Jin Sung Shin, Kyung-Deuk Ryang, and Han Woong Yeom Finite-size effects in charge-density waves (CDWs) were unveiled using scanning tunneling microscopy for metallic atomic wires on the Au/Si(553) surface, as terminated by adsorbate impurities. We found that CDW formed at low temperature adopts the finite-length boundary condition in two distinct way... [Phys. Rev. B 85, 073401] Published Fri Feb 03, 2012

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

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Large enhancement of thermoelectric effects in a double quantum dot system due to interference and Coulomb correlation phenomena (2012)

Piotr Trocha and Józef Barnaś

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-02-05

Description: Author(s): Piotr Trocha and Józef Barnaś Thermoelectric effects in a double quantum dot system coupled to external magnetic/nonmagnetic leads are investigated theoretically. The basic thermoelectric transport characteristics, like thermopower, electronic contribution to heat conductance, and the corresponding figure of merit, have been cal... [Phys. Rev. B 85, 085408] Published Fri Feb 03, 2012

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

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Bose-Einstein condensate as a quantum memory for a photonic polarization qubit (2012)

Stefan Riedl, Matthias Lettner, Christoph Vo, Simon Baur, Gerhard Rempe, and Stephan Dürr

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-14

Description: Author(s): Stefan Riedl, Matthias Lettner, Christoph Vo, Simon Baur, Gerhard Rempe, and Stephan Dürr A scheme based on electromagnetically induced transparency is used to store light in a Bose-Einstein condensate. In this process, a photonic polarization qubit is stored in atomic Zeeman states. The performance of the storage process is characterized and optimized. The average process fidelity is 1.... [Phys. Rev. A 85, 022318] Published Mon Feb 13, 2012

Keywords: Quantum information

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Fermi liquid of two-dimensional polar molecules (2012)

Zhen-Kai Lu and G. V. Shlyapnikov

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-14

Description: Author(s): Zhen-Kai Lu and G. V. Shlyapnikov We study Fermi-liquid properties of a weakly interacting two-dimensional gas of single-component fermionic polar molecules with dipole moments d oriented perpendicularly to the plane of their translational motion. This geometry allows the minimization of inelastic losses due to chemical reactions fo... [Phys. Rev. A 85, 023614] Published Mon Feb 13, 2012

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

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Tight lower bound to the geometric measure of quantum discord (2012)

Ali Saif M. Hassan, Behzad Lari, and Pramod S. Joag

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-14

Description: Author(s): Ali Saif M. Hassan, Behzad Lari, and Pramod S. Joag Dakic, Vedral, and Brukner [ B. Dakic, V. Vedral and Č. Brukner Phys. Rev. Lett. 105 190502 (2010) ] gave a geometric measure of quantum discord in a bipartite quantum state as the distance of the state from the closest classical quantum (or zero discord) state and derived an explicit formula for a ... [Phys. Rev. A 85, 024302] Published Mon Feb 13, 2012

Keywords: Quantum information

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Penetration of a vortex dipole across an interface of Bose-Einstein condensates (2012)

Tomohiko Aioi, Tsuyoshi Kadokura, and Hiroki Saito

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-15

Description: Author(s): Tomohiko Aioi, Tsuyoshi Kadokura, and Hiroki Saito The dynamics of a vortex dipole in a quasi-two-dimensional two-component Bose-Einstein condensate is investigated. A vortex dipole is shown to penetrate the interface between the two components when the incident velocity is sufficiently large. A vortex dipole can also disappear or disintegrate at th... [Phys. Rev. A 85, 023618] Published Tue Feb 14, 2012

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

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Quantum phase transitions of ultracold Bose systems in nonrectangular optical lattices (2012)

Zhi Lin, Jun Zhang, and Ying Jiang

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-15

Description: Author(s): Zhi Lin, Jun Zhang, and Ying Jiang In this paper, we investigate systematically the Mott-insulator–superfluid quantum phase transitions for ultracold scalar bosons in triangular, hexagonal, and Kagomé optical lattices. With the help of the field-theoretical effective potential, by treating the hopping term in the Bose-Hubbard model a... [Phys. Rev. A 85, 023619] Published Tue Feb 14, 2012

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

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Three-dimensional Bose gas near a Feshbach resonance (2012)

Dmitry Borzov, Mohammad S. Mashayekhi, Shizhong Zhang, Jun-Liang Song, and Fei Zhou

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-15

Description: Author(s): Dmitry Borzov, Mohammad S. Mashayekhi, Shizhong Zhang, Jun-Liang Song, and Fei Zhou In this paper, we explore the nature of three-dimensional Bose gases at large positive scattering lengths via resummation of dominating processes involving a minimum number of virtual atoms. We focus on the energetics of the nearly fermionized Bose gases beyond the usual dilute limit. We also find t... [Phys. Rev. A 85, 023620] Published Tue Feb 14, 2012

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

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Nonexponential one-body loss in a Bose-Einstein condensate (2012)

S. Knoop, J. S. Borbely, R. van Rooij, and W. Vassen

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-15

Description: Author(s): S. Knoop, J. S. Borbely, R. van Rooij, and W. Vassen We have studied the decay of a Bose-Einstein condensate (BEC) of metastable helium atoms in an optical dipole trap. In the regime where two- and three-body losses can be neglected we show that the Bose-Einstein condensate and the thermal cloud show fundamentally different decay characteristics. The ... [Phys. Rev. A 85, 025602] Published Tue Feb 14, 2012

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

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Pairing instabilities in quasi-two-dimensional Fermi gases (2012)

Ville Pietilä, David Pekker, Yusuke Nishida, and Eugene Demler

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-15

Description: Author(s): Ville Pietilä, David Pekker, Yusuke Nishida, and Eugene Demler We study nonequilibrium dynamics of ultracold two-component Fermi gases in low-dimensional geometries after the interactions are quenched from a weakly interacting to a strongly interacting regime. We develop a T -matrix formalism that takes into account the interplay between Pauli blocking and tight... [Phys. Rev. A 85, 023621] Published Tue Feb 14, 2012

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

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Spin-selective transport through helical molecular systems (2012)

R. Gutierrez, E. Díaz, R. Naaman, and G. Cuniberti

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-02-17

Description: Author(s): R. Gutierrez, E. Díaz, R. Naaman, and G. Cuniberti Highly spin-selective transport of electrons through a helically shaped electrostatic potential is demonstrated in the frame of a minimal model approach. The effect is significant even for weak spin-orbit coupling. Two main factors determine the selectivity: an unconventional Rashba-like spin-orbit ... [Phys. Rev. B 85, 081404] Published Thu Feb 16, 2012

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

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Adsorbate-induced reconstruction by C_{60} on close-packed metal surfaces: Mechanism for different types of reconstruction (2012)

Xing-Qiang Shi, Michel A. Van Hove, and Rui-Qin Zhang

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-02-22

Description: Author(s): Xing-Qiang Shi, Michel A. Van Hove, and Rui-Qin Zhang Recent studies reveal that reconstruction of close-packed metal surfaces induced by C 60 adsorption is the rule rather than the exception. Two types of reconstruction are reported for C 60 on different surfaces: (1) C 60 sinks into a 7-atom hole, such as on Cu(111); and (2) C 60 sits over a 1-atom hole,... [Phys. Rev. B 85, 075421] Published Tue Feb 21, 2012

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

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Phase diagrams of two-dimensional and three-dimensional disordered Bose gases in the local density approximation (2012)

Thomas Bourdel

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-22

Description: Author(s): Thomas Bourdel We study superfluid transitions in bidimensional (2D) and tridimensional (3D) disordered and interacting Bose gases. We work in the limit of long-range correlated disorder such that it can be treated in the local density approximation. We present superfluid transition curves in both the disorder-tem... [Phys. Rev. A 86, 063626] Published Fri Dec 21, 2012

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

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Nonequilibrium quantum phase transitions in the Ising model (2012)

V. M. Bastidas, C. Emary, G. Schaller, and T. Brandes

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-22

Description: Author(s): V. M. Bastidas, C. Emary, G. Schaller, and T. Brandes We establish a set of nonequilibrium quantum phase transitions in the Ising model driven under monochromatic nonadiabatic modulation of the transverse field. We show that besides the Ising-like critical behavior, the system exhibits an anisotropic transition which is absent in equilibrium. The noneq... [Phys. Rev. A 86, 063627] Published Fri Dec 21, 2012

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

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Designer reflectors using spoof surface plasmons in the terahertz range (2012)

Jingbo Liu, Rajind Mendis, and Daniel M. Mittleman

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-22

Description: Author(s): Jingbo Liu, Rajind Mendis, and Daniel M. Mittleman We show that spoof surface plasmons can be used to control the reflection of terahertz radiation at the output facet of a parallel-plate waveguide. Using a periodic groove pattern on the output face, reflectivity approaching 100% can be achieved within a limited spectral range. Unlike the convention... [Phys. Rev. B 86, 241405] Published Fri Dec 21, 2012

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

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Entanglement and area laws in weakly correlated Gaussian states (2012)

J. M. Matera, R. Rossignoli, and N. Canosa

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-27

Description: Author(s): J. M. Matera, R. Rossignoli, and N. Canosa We examine the evaluation of entanglement measures in weakly correlated Gaussian states. It is shown that they can be expressed in terms of the singular values of a particular block of the generalized contraction matrix. This result enables us to obtain in a simple way asymptotic expressions and rel... [Phys. Rev. A 86, 062324] Published Wed Dec 26, 2012

Keywords: Quantum information

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Imperfect measurement settings: Implications for quantum state tomography and entanglement witnesses (2012)

Denis Rosset, Raphael Ferretti-Schöbitz, Jean-Daniel Bancal, Nicolas Gisin, and Yeong-Cherng Liang

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-27

Description: Author(s): Denis Rosset, Raphael Ferretti-Schöbitz, Jean-Daniel Bancal, Nicolas Gisin, and Yeong-Cherng Liang Reliable and well-characterized quantum resources are indispensable ingredients in quantum information processing. Typically, in a realistic characterization of these resources, apparatuses come with intrinsic uncertainties that can manifest themselves in the form of systematic errors. While systema... [Phys. Rev. A 86, 062325] Published Wed Dec 26, 2012

Keywords: Quantum information

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Spin-orbit-coupled Bose-Einstein condensates confined in concentrically coupled annular traps (2012)

Xiao-Fei Zhang, Rui-Fang Dong, Tao Liu, W. M. Liu, and Shou-Gang Zhang

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-27

Description: Author(s): Xiao-Fei Zhang, Rui-Fang Dong, Tao Liu, W. M. Liu, and Shou-Gang Zhang We investigate the ground state of spin-orbit-coupled Bose-Einstein condensates confined in concentrically coupled annular traps within the full parameter space accounts for all the nonlinear two-body collisions and the spin-orbit coupling. We find that depending on the ratio between interaction par... [Phys. Rev. A 86, 063628] Published Wed Dec 26, 2012

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

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Macroscopic quantum tunneling of Bose-Einstein condensates with long-range interaction (2012)

Kai Marquardt, Pascal Wieland, Rolf Häfner, Holger Cartarius, Jörg Main, and Günter Wunner

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-27

Description: Author(s): Kai Marquardt, Pascal Wieland, Rolf Häfner, Holger Cartarius, Jörg Main, and Günter Wunner The ground state of Bose-Einstein condensates with attractive particle interactions is metastable. One of the decay mechanisms of the condensate is a collapse by macroscopic quantum tunneling, which can be described by the bounce trajectory as a solution of the time-dependent Gross-Pitaevskii equati... [Phys. Rev. A 86, 063629] Published Wed Dec 26, 2012

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

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Gaussian postselection and virtual noiseless amplification in continuous-variable quantum key distribution (2012)

Jaromír Fiurášek and Nicolas J. Cerf

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-27

Description: Author(s): Jaromír Fiurášek and Nicolas J. Cerf Noiseless amplification or attenuation are two heralded filtering operations that enable amplifying or de-amplifying a quantum state of light with no added noise, at the cost of a small success probability. We show that inserting such noiseless operations in a transmission line improves the performa... [Phys. Rev. A 86, 060302] Published Wed Dec 26, 2012

Keywords: Quantum information

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Potential energy surface for graphene on graphene: Ab initio derivation, analytical description, and microscopic interpretation (2012)

M. Reguzzoni, A. Fasolino, E. Molinari, and M. C. Righi

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-28

Description: Author(s): M. Reguzzoni, A. Fasolino, E. Molinari, and M. C. Righi We derive an analytical expression that describes the interaction energy between two graphene layers identically oriented as a function of the relative lateral and vertical positions, in excellent agreement with first principles calculations. Thanks to its formal simplicity, the proposed model allow... [Phys. Rev. B 86, 245434] Published Thu Dec 27, 2012

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

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Robust adaptive measurement scheme for qubit-state preparation (2012)

Saki Tanaka and Naoki Yamamoto

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-28

Description: Author(s): Saki Tanaka and Naoki Yamamoto In this paper, the method of adaptive measurement for qubit-state preparation developed by Jacobs is reconsidered, and an alternative scheme that works even under unknown unitary evolution of the state is shown. The key idea is that the measurement is adaptively changed so that one of the eigenstate... [Phys. Rev. A 86, 062331] Published Thu Dec 27, 2012

Keywords: Quantum information

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Qubit-qudit states with positive partial transpose (2012)

Lin Chen and Dragomir Ž. Đoković

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-28

Description: Author(s): Lin Chen and Dragomir Ž. Đoković We show that the length of a qubit-qutrit separable state is equal to max( r , s ), where r is the rank of the state and s the rank of its partial transpose. We refer to the ordered pair ( r , s ) as the birank of this state. We also construct examples of qubit-qutrit separable states of any feasible birank... [Phys. Rev. A 86, 062332] Published Thu Dec 27, 2012

Keywords: Quantum information

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Leggett-Garg inequality in electron interferometers (2012)

Clive Emary, Neill Lambert, and Franco Nori

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-28

Description: Author(s): Clive Emary, Neill Lambert, and Franco Nori We consider the violation of the Leggett-Garg inequality in electronic Mach-Zehnder inteferometers. This setup has two distinct advantages over earlier quantum-transport proposals: Firstly, the required correlation functions can be obtained without time-resolved measurements. Secondly, the geometry ... [Phys. Rev. B 86, 235447] Published Thu Dec 27, 2012

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

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Localization of an inhomogeneous Bose-Einstein condensate in a moving random potential (2012)

Ardavan Alamir, Pablo Capuzzi, and Patrizia Vignolo

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-29

Description: Author(s): Ardavan Alamir, Pablo Capuzzi, and Patrizia Vignolo We study the dynamics of a harmonically trapped quasi-one-dimensional Bose-Einstein condensate subjected to a moving disorder potential of finite extent. We show that, due to the inhomogeneity of the sample, only a percentage of the atoms is localized at supersonic velocities of a random potential. ... [Phys. Rev. A 86, 063637] Published Fri Dec 28, 2012

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

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Symmetry-dependent transport properties and bipolar spin filtering in zigzag α-graphyne nanoribbons (2012)

Qu Yue, Shengli Chang, Jichun Tan, Shiqiao Qin, Jun Kang, and Jingbo Li

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-29

Description: Author(s): Qu Yue, Shengli Chang, Jichun Tan, Shiqiao Qin, Jun Kang, and Jingbo Li First-principles calculations are performed to investigate the transport properties of zigzag α -graphyne nanoribbons (Z α GNRs). It is found that asymmetric Z α GNRs behave as conductors with linear current-voltage relationships, whereas symmetric Z α GNRs have very small currents under finite bias voltag... [Phys. Rev. B 86, 235448] Published Fri Dec 28, 2012

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

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Multiple light-coupling modes of confined excitons observable in photoluminescence spectra of high-quality CuCl thin films (2012)

L. Q. Phuong, M. Ichimiya, H. Ishihara, and M. Ashida

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-29

Description: Author(s): L. Q. Phuong, M. Ichimiya, H. Ishihara, and M. Ashida We report the observation of multiple light-coupling modes of excitons confined in CuCl thin films with thicknesses of a few hundred nanometers beyond the long-wavelength approximation in photoluminescence spectra. Due to a remarkably long coupling length between light and multinode-type excitons re... [Phys. Rev. B 86, 235449] Published Fri Dec 28, 2012

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

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Ab initio many-body study of cobalt adatoms adsorbed on graphene (2012)

Yudistira Virgus, Wirawan Purwanto, Henry Krakauer, and Shiwei Zhang

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-29

Description: Author(s): Yudistira Virgus, Wirawan Purwanto, Henry Krakauer, and Shiwei Zhang Many recent calculations have been performed to study a Co atom adsorbed on graphene, with significantly varying results on the nature of the bonding. We use the auxiliary-field quantum Monte Carlo method and a size-correction embedding scheme to accurately calculate the binding energy of Co on grap... [Phys. Rev. B 86, 241406] Published Fri Dec 28, 2012

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

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Objective quasicontinuum approach for rod problems (2012)

Ye. Hakobyan, E. B. Tadmor, and R. D. James

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-29

Description: Author(s): Ye. Hakobyan, E. B. Tadmor, and R. D. James An objective quasicontinuum (OQC) method is developed for simulating rodlike systems that can be represented as a combination of locally objective structures. An objective structure (OS) is one for which a group of atoms, called a “fundamental domain” (FD), is repeated using specific rules of transl... [Phys. Rev. B 86, 245435] Published Fri Dec 28, 2012

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

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Finite-size energy gap in weak and strong topological insulators (2012)

Ken-Ichiro Imura, Mayuko Okamoto, Yukinori Yoshimura, Yositake Takane, and Tomi Ohtsuki

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-29

Description: Author(s): Ken-Ichiro Imura, Mayuko Okamoto, Yukinori Yoshimura, Yositake Takane, and Tomi Ohtsuki The nontrivialness of a topological insulator (TI) is characterized either by a bulk topological invariant or by the existence of a protected metallic surface state. Yet, in realistic samples of finite size, this nontrivialness does not necessarily guarantee the gaplessness of the surface state. Dep... [Phys. Rev. B 86, 245436] Published Fri Dec 28, 2012

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

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Magnetic properties of O_{2} adsorbed on Cu(100): A spin-polarized metastable He beam study (2012)

M. Kurahashi, X. Sun, and Y. Yamauchi

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-21

Description: Author(s): M. Kurahashi, X. Sun, and Y. Yamauchi Magnetic properties of O 2 adsorbed on Cu(100) were investigated by monitoring the spin dependence in Penning ionization of metastable He(2 3 S ) under external magnetic fields of 0–5 T. A clear spin polarization was found for the 3 σ g and 1 π u orbitals of physisorbed O 2 under external fields, while the s... [Phys. Rev. B 86, 245421] Published Thu Dec 20, 2012

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

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Anisotropic dynamics of a spin-orbit-coupled Bose-Einstein condensate (2012)

Giovanni I. Martone, Yun Li, Lev P. Pitaevskii, and Sandro Stringari

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-20

Description: Author(s): Giovanni I. Martone, Yun Li, Lev P. Pitaevskii, and Sandro Stringari By calculating the density response function we identify the excitation spectrum of a Bose-Einstein condensate with equal Rashba and Dresselhaus spin-orbit coupling. We find that the velocity of sound along the direction of spin-orbit coupling is deeply quenched and vanishes when one approaches the ... [Phys. Rev. A 86, 063621] Published Wed Dec 19, 2012

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

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Acceleration of adiabatic transport of interacting particles and rapid manipulations of a dilute Bose gas in the ground state (2012)

Shumpei Masuda

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-20

Description: Author(s): Shumpei Masuda We show a method to accelerate quantum adiabatic transport of identical spinless particles interacting with each other by developing the preceding fast-forward scaling theory formed for one-particle systems [ Masuda and Nakamura Proc. R. Soc. A 466 1135 (2010) ]. We derive a driving potential which ... [Phys. Rev. A 86, 063624] Published Wed Dec 19, 2012

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

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Relativistic effects in atom and neutron interferometry and the differences between them (2012)

Daniel M. Greenberger, Wolfgang P. Schleich, and Ernst M. Rasel

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-20

Description: Author(s): Daniel M. Greenberger, Wolfgang P. Schleich, and Ernst M. Rasel In recent years there has been enormous progress in matter wave interferometry. The Colella-Overhauser-Werner (COW) type of neutron interferometer and the Kasevich-Chu (K-C) atom interferometer are the prototypes of such devices and the issue of whether they are sensitive to relativistic effects has... [Phys. Rev. A 86, 063622] Published Wed Dec 19, 2012

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

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Nonlinear damping in graphene resonators (2012)

Alexander Croy, Daniel Midtvedt, Andreas Isacsson, and Jari M. Kinaret

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-21

Description: Author(s): Alexander Croy, Daniel Midtvedt, Andreas Isacsson, and Jari M. Kinaret Based on a continuum mechanical model for single-layer graphene, we propose and analyze a microscopic mechanism for dissipation in nanoelectromechanical graphene resonators. We find that coupling between flexural modes and in-plane phonons leads to linear and nonlinear damping of out-of-plane vibrat... [Phys. Rev. B 86, 235435] Published Thu Dec 20, 2012

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

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Conventional and acoustic surface plasmons on noble metal surfaces: A time-dependent density functional theory study (2012)

Jun Yan, Karsten W. Jacobsen, and Kristian S. Thygesen

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-21

Description: Author(s): Jun Yan, Karsten W. Jacobsen, and Kristian S. Thygesen First-principles calculations of the conventional and acoustic surface plasmons (CSPs and ASPs) on the (111) surfaces of Cu, Ag, and Au are presented. The effect of s - d interband transitions on both types of plasmons is investigated by comparing results from the local density approximation and an or... [Phys. Rev. B 86, 241404] Published Thu Dec 20, 2012

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

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Vortex–bright-soliton dipoles: Bifurcations, symmetry breaking, and soliton tunneling in a vortex-induced double well (2012)

M. Pola, J. Stockhofe, P. Schmelcher, and P. G. Kevrekidis

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-11-03

Description: Author(s): M. Pola, J. Stockhofe, P. Schmelcher, and P. G. Kevrekidis The emergence of vortex-bright soliton dipoles in two-component Bose-Einstein condensates through bifurcations from suitable eigenstates of the underlying linear system is examined. These dipoles can have their bright solitary structures be in phase (symmetric) or out of phase (anti-symmetric). The ... [Phys. Rev. A 86, 053601] Published Fri Nov 02, 2012

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

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Quantifying the noise of a quantum channel by noise addition (2012)

A. De Pasquale and V. Giovannetti

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-11-03

Description: Author(s): A. De Pasquale and V. Giovannetti In this paper we introduce a way to quantify the noise level associated to a given quantum transformation. The key mechanism lying at the heart of the proposal is noise addition : in other words we compute the amount of extra noise we need to add to the system through convex combination with a refere... [Phys. Rev. A 86, 052302] Published Thu Nov 01, 2012

Keywords: Quantum information

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Structure and zero-dimensional polariton spectrum of natural defects in GaAs/AlAs microcavities (2012)

Joanna M. Zajac and Wolfgang Langbein

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-11-03

Description: Author(s): Joanna M. Zajac and Wolfgang Langbein We present a correlative study of structural and optical properties of natural defects in planar semiconductor microcavities grown by molecular beam epitaxy, which are showing a localized polariton spectrum as reported in Zajac et al. [ Phys. Rev. B 85 165309 (2012) ]. The three-dimensional spatial ... [Phys. Rev. B 86, 195401] Published Thu Nov 01, 2012

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

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Deconfinement-induced collapse of a coherent array of dipolar Bose-Einstein condensates (2012)

J. Billy, E. A. L. Henn, S. Müller, T. Maier, H. Kadau, A. Griesmaier, M. Jona-Lasinio, L. Santos, and T. Pfau

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-11-08

Description: Author(s): J. Billy, E. A. L. Henn, S. Müller, T. Maier, H. Kadau, A. Griesmaier, M. Jona-Lasinio, L. Santos, and T. Pfau We report on the observation of the collapse of a dipolar Bose-Einstein condensate (BEC) upon release from a one-dimensional optical lattice. In strong contrast with the typical behavior of quantum gases under time of flight (TOF), we show here that a strongly dipolar BEC, stabilized in the lattice,... [Phys. Rev. A 86, 051603] Published Wed Nov 07, 2012

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

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Rippling instabilities in suspended nanoribbons (2012)

Hailong Wang and Moneesh Upmanyu

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-11-08

Description: Author(s): Hailong Wang and Moneesh Upmanyu Morphology mediates the interplay between the structure and electronic transport in atomically thin nanoribbons such as graphene as the relaxation of edge stresses occurs preferentially via out-of-plane deflections. In the case of end-supported suspended nanoribbons that we study here, past experime... [Phys. Rev. B 86, 205411] Published Wed Nov 07, 2012

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

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Majorana states in inhomogeneous spin ladders (2012)

Fabio L. Pedrocchi, Stefano Chesi, Suhas Gangadharaiah, and Daniel Loss

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-11-08

Description: Author(s): Fabio L. Pedrocchi, Stefano Chesi, Suhas Gangadharaiah, and Daniel Loss We propose an inhomogeneous open spin ladder, related to the Kitaev honeycomb model, which can be tuned between topological and nontopological phases. In extension of Lieb's theorem, we show numerically that the ground state of the spin ladder is either vortex free or vortex full. We study the robus... [Phys. Rev. B 86, 205412] Published Wed Nov 07, 2012

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

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Stacking order, interaction, and weak surface magnetism in layered graphene sheets (2012)

Dong-Hui Xu, Jie Yuan, Zi-Jian Yao, Yi Zhou, Jin-Hua Gao, and Fu-Chun Zhang

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-11-08

Description: Author(s): Dong-Hui Xu, Jie Yuan, Zi-Jian Yao, Yi Zhou, Jin-Hua Gao, and Fu-Chun Zhang Recent transport experiments have demonstrated that rhombohedral-stacking trilayer graphene is an insulator with an intrinsic gap of 6 meV and Bernal-stacking trilayer graphene is a metal. We propose a Hubbard model with a moderate U for layered graphene sheets, and show that the model well explains... [Phys. Rev. B 86, 201404] Published Wed Nov 07, 2012

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

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Modified Bethe-Peierls boundary condition for ultracold atoms with spin-orbit coupling (2012)

Peng Zhang, Long Zhang, and Youjin Deng

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-11-09

Description: Author(s): Peng Zhang, Long Zhang, and Youjin Deng We show that the Bethe-Peierls (BP) boundary condition should be modified for ultracold atoms with spin-orbit (SO) coupling. Moreover, we derive a general form of the modified BP boundary condition, which is applicable to a system with an arbitrary kind of SO coupling. In the modified BP condition, ... [Phys. Rev. A 86, 053608] Published Thu Nov 08, 2012

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

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Heat and spin transport in a cold atomic Fermi gas (2012)

Hyungwon Kim and David A. Huse

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-11-09

Description: Author(s): Hyungwon Kim and David A. Huse Motivated by recent experiments measuring the spin transport in ultracold unitary atomic Fermi gases [ Sommer et al. Nature (London) 472 201 (2011) ; Sommer et al. New J. Phys. 13 055009 (2011) ], we explore the theory of spin and heat transport in a three-dimensional spin-polarized atomic Fermi ga... [Phys. Rev. A 86, 053607] Published Thu Nov 08, 2012

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

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Strongly entangled light from planar microcavities (2012)

D. Pagel, H. Fehske, J. Sperling, and W. Vogel

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-11-10

Description: Author(s): D. Pagel, H. Fehske, J. Sperling, and W. Vogel The emission of entangled light from planar semiconductor microcavities is studied and the entanglement properties are analyzed and quantified. Phase matching of the intracavity scattering dynamics for multiple pump beams or pulses, together with the coupling to external radiation, leads to the emis... [Phys. Rev. A 86, 052313] Published Fri Nov 09, 2012

Keywords: Quantum information

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High-fidelity entanglement purification using chains of atoms and optical cavities (2012)

Denis Gonţa and Peter van Loock

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-11-10

Description: Author(s): Denis Gonţa and Peter van Loock In our previous paper [D. Gonţa and P. van Loock, Phys. Rev. A 84 042303 (2011) ], we proposed an efficient scheme to purify dynamically a bipartite entangled state using short chains of atoms coupled to high-finesse optical cavities. In contrast to conventional entanglement purification protocols,... [Phys. Rev. A 86, 052312] Published Fri Nov 09, 2012

Keywords: Quantum information

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86

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Quantum dissonance is rejected in an overlap measurement scheme (2012)

Chang-shui Yu, Jun Zhang, and Heng Fan

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-11-14

Description: Author(s): Chang-shui Yu, Jun Zhang, and Heng Fan The overlap measurement scheme accomplishes the evaluation of the overlap of two input quantum states by only measuring an introduced auxiliary qubit, irrespective of the complexity of the two input states. We find a counterintuitive phenomenon that no quantum dissonance can be found in the process ... [Phys. Rev. A 86, 052317] Published Tue Nov 13, 2012

Keywords: Quantum information

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87

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Demonstration of active feedforward one-way quantum computing with photon-matter hyperentanglement (2012)

Xiao-Fan Xu, Xiao-Hui Bao, and Jian-Wei Pan

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-11-14

Description: Author(s): Xiao-Fan Xu, Xiao-Hui Bao, and Jian-Wei Pan We report an optical one-way quantum computing experiment with stationary quantum memory involved. First we create a hybrid four-qubit cluster state with two qubits propagating as photons and the other two stationary and stored in a laser-cooled atomic-ensemble quantum memory, and characterize it wi... [Phys. Rev. A 86, 050304] Published Tue Nov 13, 2012

Keywords: Quantum information

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Quantum search using non-Hermitian adiabatic evolution (2012)

Alexander I. Nesterov and Gennady P. Berman

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-11-13

Description: Author(s): Alexander I. Nesterov and Gennady P. Berman We propose a non-Hermitian quantum annealing algorithm which can be useful for solving complex optimization problems. We demonstrate our approach on Grover's problem [ L. K. Grover Phys. Rev. Lett. 79 325 (1997) ] of finding a marked item inside of an unsorted database. We show that the energy gap b... [Phys. Rev. A 86, 052316] Published Mon Nov 12, 2012

Keywords: Quantum information

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89

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Channeling of a subangstrom electron beam in a crystal mapped to two-dimensional molecular orbitals (2012)

Robert Hovden, Huolin L. Xin, and David A. Muller

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-11-13

Description: Author(s): Robert Hovden, Huolin L. Xin, and David A. Muller The propagation of high-energy electrons in crystals is in general a complicated multiple-scattering problem. However, along high-symmetry zone axes the problem can be mapped to the time evolution of a two-dimensional (2D) molecular system. Each projected atomic column can be approximated by the pot... [Phys. Rev. B 86, 195415] Published Mon Nov 12, 2012

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

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Theory of zero-bias anomaly in low-temperature inelastic tunneling spectroscopy (2012)

Yoshihiro Asai

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-11-13

Description: Author(s): Yoshihiro Asai A small zero-bias anomaly (ZBA) in inelastic tunneling spectroscopy (IETS) through nonmagnetic quantum wires has been suggested experimentally at low temperatures. Here, the mechanism is discussed theoretically with special attention paid to contributions from low energy phonons. Our theoretical cal... [Phys. Rev. B 86, 201405] Published Mon Nov 12, 2012

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

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91

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Excitonic instabilities and insulating states in bilayer graphene (2012)

Kok Wee Song, Yung-Ching Liang, and Stephan Haas

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-11-13

Description: Author(s): Kok Wee Song, Yung-Ching Liang, and Stephan Haas The competing ground states of bilayer graphene are studied by applying renormalization group techniques to a bilayer honeycomb lattice with nearest neighbor hopping. In the absence of interactions, the Fermi surface of this model at half-filling consists of two nodal points with momenta K , K ′ , wher... [Phys. Rev. B 86, 205418] Published Mon Nov 12, 2012

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

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92

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Dynamics of inertial vortices in multicomponent Bose-Einstein condensates (2012)

Katsuhiro Nakamura, Doniyor Babajanov, Davron Matrasulov, and Michikazu Kobayashi

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-11-15

Description: Author(s): Katsuhiro Nakamura, Doniyor Babajanov, Davron Matrasulov, and Michikazu Kobayashi With use of the nonlinear Schrödinger (or Gross-Pitaevskii) equation with strong repulsive cubic nonlinearity, dynamics of multicomponent Bose-Einstein condensates (BECs) with a harmonic trap in two dimensions is investigated beyond the Thomas-Fermi regime. In the case when each component has a sing... [Phys. Rev. A 86, 053613] Published Wed Nov 14, 2012

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

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93

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Metallic behavior in low-dimensional honeycomb SiB crystals: A first-principles prediction of atomic structure and electronic properties (2012)

Anders Hansson, F. de Brito Mota, and Roberto Rivelino

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-11-15

Description: Author(s): Anders Hansson, F. de Brito Mota, and Roberto Rivelino We present a detailed analysis of the atomic and electronic structure of a two-dimensional monolayer of boron and silicon elements within periodic density functional theory. The proposed h-SiB sheet is a structural analog of hexagonal boron nitride (h-BN) and exhibits a good structural stability, co... [Phys. Rev. B 86, 195416] Published Wed Nov 14, 2012

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

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94

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Designer quantum spin Hall phase transition in molecular graphene (2012)

Pouyan Ghaemi, Sarang Gopalakrishnan, and Taylor L. Hughes

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-11-15

Description: Author(s): Pouyan Ghaemi, Sarang Gopalakrishnan, and Taylor L. Hughes Graphene was the first material predicted to be a time-reversal-invariant topological insulator [ C. L. Kane and E. J. Mele Phys. Rev. Lett. 95 226801 (2005) ]; however, the insulating gap is immeasurably small owing to the weakness of spin-orbit interactions in graphene. A recent experiment [ K. K.... [Phys. Rev. B 86, 201406] Published Wed Nov 14, 2012

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

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Defect and impurity properties of hexagonal boron nitride: A first-principles calculation (2012)

Bing Huang and Hoonkyung Lee

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-08

Description: Author(s): Bing Huang and Hoonkyung Lee In this paper, we have systematically studied the structural and electronic properties of vacancy defects and carbon impurity in hexagonal boron nitride ( h -BN) by using both normal GGA calculations and advanced hybrid functional calculations. Our calculations show that the defect configurations and ... [Phys. Rev. B 86, 245406] Published Fri Dec 07, 2012

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

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96

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Momentum-resolved radio-frequency spectroscopy of a spin-orbit-coupled atomic Fermi gas near a Feshbach resonance in harmonic traps (2012)

Shi-Guo Peng, Xia-Ji Liu, Hui Hu, and Kaijun Jiang

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-11

Description: Author(s): Shi-Guo Peng, Xia-Ji Liu, Hui Hu, and Kaijun Jiang We theoretically investigate the momentum-resolved radio-frequency spectroscopy of a harmonically trapped atomic Fermi gas near a Feshbach resonance in the presence of equal Rashba and Dresselhaus spin-orbit coupling. The system is qualitatively modeled as an ideal gas mixture of atoms and molecules... [Phys. Rev. A 86, 063610] Published Mon Dec 10, 2012

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

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97

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Beyond mean-field low-lying excitations of dipolar Bose gases (2012)

A. R. P. Lima and A. Pelster

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-11

Description: Author(s): A. R. P. Lima and A. Pelster We theoretically investigate various beyond mean-field effects on Bose gases at zero temperature featuring the anisotropic and long-range dipole-dipole interaction in addition to the isotropic and short-range contact interaction. Within the realm of the Bogoliubov–de Gennes theory, we consider stati... [Phys. Rev. A 86, 063609] Published Mon Dec 10, 2012

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

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98

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Spin-dependent Smoluchowski effect (2012)

O. P. Polyakov, M. Corbetta, O. V. Stepanyuk, H. Oka, A. M. Saletsky, D. Sander, V. S. Stepanyuk, and J. Kirschner

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-11

Description: Author(s): O. P. Polyakov, M. Corbetta, O. V. Stepanyuk, H. Oka, A. M. Saletsky, D. Sander, V. S. Stepanyuk, and J. Kirschner Electron charge near atomically sharp corrugations at the surfaces of a solid tends to spill out and smoothen the abrupt variation of the positions of the positively charged atomic nuclei. The reason is that electrons are much less localized than nuclei. This has been discussed already some 70 years... [Phys. Rev. B 86, 235409] Published Mon Dec 10, 2012

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

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Argon-assisted growth of epitaxial graphene on Cu(111) (2012)

Zachary R. Robinson, Parul Tyagi, Tyler R. Mowll, Carl A. Ventrice, Jr., and James B. Hannon

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-11

Description: Author(s): Zachary R. Robinson, Parul Tyagi, Tyler R. Mowll, Carl A. Ventrice, Jr., and James B. Hannon The growth of graphene by catalytic decomposition of ethylene on Cu(111) in an ultrahigh vacuum system was investigated with low-energy electron diffraction, low-energy electron microscopy, and atomic force microscopy. Attempts to form a graphene overlayer using ethylene at pressures as high as 10 m... [Phys. Rev. B 86, 235413] Published Mon Dec 10, 2012

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

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100

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Effects of strain on band structure and effective masses in MoS_{2} (2012)

H. Peelaers and C. G. Van de Walle

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-11

Description: Author(s): H. Peelaers and C. G. Van de Walle We use hybrid density functional theory to explore the band structure and effective masses of MoS 2 , and the effects of strain on the electronic properties. Strain allows engineering the magnitude as well as the nature (direct versus indirect) of the band gap. Deformation potentials that quantify the... [Phys. Rev. B 86, 241401] Published Mon Dec 10, 2012

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

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