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Parameter estimation in memory-assisted noisy quantum interferometry (2014)

P. Szańkowski, M. Trippenbach, and J. Chwedeńczuk

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-12-12

Description: Author(s): P. Szańkowski, M. Trippenbach, and J. Chwedeńczuk We demonstrate that memory in an N-qubit system subjected to decoherence, is a potential resource for the slowdown of the entanglement decay. We show that this effect can be used to retain the sub-shot-noise sensitivity of the parameter estimation in quantum interferometry. We calculate quantum Fish... [Phys. Rev. A 90, 063619] Published Thu Dec 11, 2014

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

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Superfluidity and solid order in a two-component Bose gas with dipolar interactions in an optical lattice (2014)

Yoshihito Kuno, Keita Suzuki, and Ikuo Ichinose

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-12-12

Description: Author(s): Yoshihito Kuno, Keita Suzuki, and Ikuo Ichinose In this paper, we study an extended bosonic t-J model in an optical lattice, which describes two-component hard-core bosons with nearest-neighbor pseudospin interactions and, also, inter- and intraspecies dipole-dipole interactions. In particular, we focus on the case in which two-component hard-cor... [Phys. Rev. A 90, 063620] Published Thu Dec 11, 2014

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

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Unveiling the structural origin of the high carrier mobility of a molecular monolayer on boron nitride (2014)

Rui Xu, Daowei He, Yuhan Zhang, Bing Wu, Fengyuan Liu, Lan Meng, Jun-Fang Liu, Qisheng Wu, Yi Shi, Jinlan Wang, Jia-Cai Nie, Xinran Wang, and Lin He

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-12-13

Description: Author(s): Rui Xu, Daowei He, Yuhan Zhang, Bing Wu, Fengyuan Liu, Lan Meng, Jun-Fang Liu, Qisheng Wu, Yi Shi, Jinlan Wang, Jia-Cai Nie, Xinran Wang, and Lin He Very recently, it was demonstrated that the carrier mobility of a molecular monolayer dioctylbenzothienobenzothiophene (C 8 -BTBT) on boron nitride can reach 10 cm 2 /Vs, the highest among the previously reported monolayer molecular field-effect transistors. Here we show that the high-quality single cry... [Phys. Rev. B 90, 224106] Published Fri Dec 12, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Nonequilibrium states of a quenched Bose gas (2014)

Ben Kain and Hong Y. Ling

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-12-18

Description: Author(s): Ben Kain and Hong Y. Ling Yin and Radzihovsky [X. Yin and L. Radzihovsky, Phys. Rev. A 88 , 063611 (2013)PLRAAN10.1103/PhysRevA.88.063611] recently developed a self-consistent extension of a Bogoliubov theory, in which the condensate number density n c is treated as a mean field that changes with time, in order to analyze a JI... [Phys. Rev. A 90, 063626] Published Wed Dec 17, 2014

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

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Thermally activated local collapse of a flattened dipolar condensate (2014)

E. B. Linscott and P. B. Blakie

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-11-07

Description: Author(s): E. B. Linscott and P. B. Blakie An analytical model that quantifies the energy barrier to local collapse of a flattened dipolar condensate is developed, and a stochastic Gross-Pitaevskii theory is used to perform finite-temperature simulations verifying the local collapse scenario. [Phys. Rev. A 90, 053605] Published Thu Nov 06, 2014

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

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Shaping topological properties of the band structures in a shaken optical lattice (2014)

Shao-Liang Zhang and Qi Zhou

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-11-07

Description: Author(s): Shao-Liang Zhang and Qi Zhou The realization of band structures with nontrivial topological properties in an optical lattice is an exciting topic in current studies of ultracold atoms. Here we point out that this lofty goal can be achieved by using a simple scheme of shaking an optical lattice, which is directly applicable in c... [Phys. Rev. A 90, 051601] Published Thu Nov 06, 2014

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

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Structural transitions of nearly second order in classical dipolar gases (2014)

Florian Cartarius, Giovanna Morigi, and Anna Minguzzi

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-11-04

Description: Author(s): Florian Cartarius, Giovanna Morigi, and Anna Minguzzi Particles with repulsive power-law interactions undergo a transition from a single to a double chain (zigzag) by decreasing the confinement in the transverse direction. We theoretically characterize this transition when the particles are classical dipoles, polarized perpendicularly to the plane in w... [Phys. Rev. A 90, 053601] Published Mon Nov 03, 2014

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

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Impact of deformation on the atomic structures and dynamics of a Cu-Zr metallic glass: A molecular dynamics study (2014)

Y. Zhang, M. I. Mendelev, C. Z. Wang, R. Ott, F. Zhang, M. F. Besser, K. M. Ho, and M. J. Kramer

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-11-04

Description: Author(s): Y. Zhang, M. I. Mendelev, C. Z. Wang, R. Ott, F. Zhang, M. F. Besser, K. M. Ho, and M. J. Kramer Despite numerous studies on the atomic structures of Cu-Zr metallic glasses (MGs), their inherent structural ordering, e.g., medium-range order (MRO), remains difficult to describe. Specifically lacking is an understanding of how the MRO responds to deformation and the associated changes in atomic m... [Phys. Rev. B 90, 174101] Published Mon Nov 03, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Condensation phenomena in plasmonics (2014)

J.-P. Martikainen, M. O. J. Heikkinen, and P. Törmä

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-11-06

Description: Author(s): J.-P. Martikainen, M. O. J. Heikkinen, and P. Törmä We study arrays of plasmonic nanoparticles combined with quantum emitters, quantum plasmonic lattices, as a platform for room-temperature studies of quantum many-body physics. We outline a theory to describe surface plasmon-polariton distributions when they are coupled to externally pumped molecules... [Phys. Rev. A 90, 053604] Published Wed Nov 05, 2014

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

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Solute-defect interactions in Al-Mg alloys from diffusive variational Gaussian calculations (2014)

E. Dontsova, J. Rottler, and C. W. Sinclair

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-11-06

Description: Author(s): E. Dontsova, J. Rottler, and C. W. Sinclair Resolving atomic-scale defect topologies and energetics with accurate atomistic interaction models provides access to the nonlinear phenomena inherent at atomic length and time scales. Coarse graining the dynamics of such simulations to look at the migration of, e.g., solute atoms, while retaining t... [Phys. Rev. B 90, 174102] Published Wed Nov 05, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Shallow halogen vacancies in halide optoelectronic materials (2014)

Hongliang Shi and Mao-Hua Du

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-11-06

Description: Author(s): Hongliang Shi and Mao-Hua Du Halogen vacancies (VH) are usually deep color centers (F centers) in halides and can act as major electron traps or recombination centers. The deep VH contributes to the typically poor carrier transport properties in halides. However, several halides have recently emerged as excellent optoelectronic... [Phys. Rev. B 90, 174103] Published Wed Nov 05, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Atom interferometer in a double-well potential (2014)

Karol Gietka and Jan Chwedeńczuk

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-12-02

Description: Author(s): Karol Gietka and Jan Chwedeńczuk We present a detailed study of an atom interferometer which can be realized in a double-well potential. We assume that the interferometric phase is imprinted in the presence of coherent tunneling between the wells. We calculate the ultimate bounds for the estimation sensitivity and show how they rel... [Phys. Rev. A 90, 063601] Published Mon Dec 01, 2014

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

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Calorimetric and acoustic emission study of martensitic transformation in single-crystalline Ni_{2}MnGa alloys (2014)

László Z. Tóth, Sándor Szabó, Lajos Daróczi, and Dezső L. Beke

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-12-05

Description: Author(s): László Z. Tóth, Sándor Szabó, Lajos Daróczi, and Dezső L. Beke The jerky character of austenite-martensite phase transformation in Ni 2 MnGa single crystals (with 10M martensite structure) has been investigated by thermal cycling using a differential scanning calorimeter (DSC) and by detection of acoustic emissions (AEs) at low cooling and heating rates (0.1 K/mi... [Phys. Rev. B 90, 224103] Published Thu Dec 04, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Spontaneous emission and thermalization of cold bosons in optical lattices (2014)

J. Schachenmayer, L. Pollet, M. Troyer, and A. J. Daley

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-01-11

Description: Author(s): J. Schachenmayer, L. Pollet, M. Troyer, and A. J. Daley We study the thermalization of excitations generated by spontaneous emission events for cold bosons in an optical lattice. Computing the dynamics described by the many-body master equation, we characterize equilibration time scales in different parameter regimes. For simple observables, we find regi... [Phys. Rev. A 89, 011601] Published Fri Jan 10, 2014

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

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Finite-temperature dynamics of vortices in Bose-Einstein condensates (2014)

S. Gautam, Arko Roy, and Subroto Mukerjee

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-01-15

Description: Author(s): S. Gautam, Arko Roy, and Subroto Mukerjee We study the dynamics of a single vortex and a pair of vortices in quasi two-dimensional Bose-Einstein condensates at finite temperatures. To this end, we use the stochastic Gross–Pitaevskii equation, which is the Langevin equation for the Bose–Einstein condensate. For a pair of vortices, we study t... [Phys. Rev. A 89, 013612] Published Tue Jan 14, 2014

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

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Ab initio modeling of the two-dimensional energy landscape of screw dislocations in bcc transition metals (2014)

L. Dezerald, Lisa Ventelon, E. Clouet, C. Denoual, D. Rodney, and F. Willaime

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-01-16

Description: Author(s): L. Dezerald, Lisa Ventelon, E. Clouet, C. Denoual, D. Rodney, and F. Willaime A density functional theory (DFT) study of the 1/2〈111〉 screw dislocation was performed in the following body-centered cubic transition metals: V, Nb, Ta, Cr, Mo, W, and Fe. The energies of the easy, hard, and split core configurations, as well as the pathways between them, were investigated and use... [Phys. Rev. B 89, 024104] Published Wed Jan 15, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Pairing effects in the nondegenerate limit of the two-dimensional Fermi gas (2014)

Marcus Barth and Johannes Hofmann

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-01-18

Description: Author(s): Marcus Barth and Johannes Hofmann The spectral function of a spin-balanced two-dimensional Fermi gas with short-range interactions is calculated by means of a quantum cluster expansion. Good qualitative agreement is found with a recent experiment by Feld et al. [Nature (London) 480 , 75 (2011)NATUAS10.1038/nature10627]. The effects o... [Phys. Rev. A 89, 013614] Published Fri Jan 17, 2014

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

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Stabilized silicene within bilayer graphene: A proposal based on molecular dynamics and density-functional tight-binding calculations (2014)

G. R. Berdiyorov, M. Neek-Amal, F. M. Peeters, and Adri C. T. van Duin

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-01-23

Description: Author(s): G. R. Berdiyorov, M. Neek-Amal, F. M. Peeters, and Adri C. T. van Duin Freestanding silicene is predicted to display comparable electronic properties as graphene. However, the yet synthesized silicenelike structures have been only realized on different substrates which turned out to exhibit versatile crystallographic structures that are very different from the theoreti... [Phys. Rev. B 89, 024107] Published Wed Jan 22, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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N incorporation and associated localized vibrational modes in GaSb (2014)

J. Buckeridge, D. O. Scanlon, T. D. Veal, M. J. Ashwin, A. Walsh, and C. R. A. Catlow

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-01-23

Description: Author(s): J. Buckeridge, D. O. Scanlon, T. D. Veal, M. J. Ashwin, A. Walsh, and C. R. A. Catlow We present results of electronic structure calculations on the N-related localized vibrational modes in the dilute nitride alloy GaSb1−xNx. By calculating the formation energies of various possible N incorporation modes in the alloy, we determine the most favorable N configurations, and we calculate... [Phys. Rev. B 89, 014107] Published Wed Jan 22, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Analytic results for a quantum quench from free to hard-core one-dimensional bosons (2014)

Márton Kormos, Mario Collura, and Pasquale Calabrese

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-01-14

Description: Author(s): Márton Kormos, Mario Collura, and Pasquale Calabrese It is widely believed that the stationary properties after a quantum quench in integrable systems can be described by a generalized Gibbs ensemble (GGE), even if all of the analytical evidence is based on free theories in which the pre- and postquench modes are linearly related. In contrast, we cons... [Phys. Rev. A 89, 013609] Published Mon Jan 13, 2014

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

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Predicting self-diffusion in metal oxides from first principles: The case of oxygen in tetragonal ZrO2 (2014)

Mostafa Youssef and Bilge Yildiz

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-01-17

Description: Author(s): Mostafa Youssef and Bilge Yildiz Theoretical prediction of self-diffusion in a metal oxide in a wide range of thermodynamic conditions has been a long-standing challenge. Here, we establish that combining the formation free energies and migration barriers of all charged oxygen defects as calculated by density functional theory, wit... [Phys. Rev. B 89, 024105] Published Thu Jan 16, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Dislocation networks in 4He crystals (2014)

A. D. Fefferman, F. Souris, A. Haziot, J. R. Beamish, and S. Balibar

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-01-17

Description: Author(s): A. D. Fefferman, F. Souris, A. Haziot, J. R. Beamish, and S. Balibar The mechanical behavior of crystals is dominated by dislocation networks, their structure, and their interactions with impurities or thermal phonons. However, in classical crystals, networks are usually random with impurities often forming nonequilibrium clusters when their motion freezes at low tem... [Phys. Rev. B 89, 014105] Published Thu Jan 16, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Local structure in perovskite (Ba,Sr)TiO3: Reverse Monte Carlo refinements from multiple measurement techniques (2014)

Igor Levin, Victor Krayzman, and Joseph C. Woicik

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-01-18

Description: Author(s): Igor Levin, Victor Krayzman, and Joseph C. Woicik Local and average structures of ceramic Ba1−xSrxTiO3 solid solutions have been reconciled using Reverse Monte Carlo (RMC) refinements of atomic positions that employ simultaneous fitting of neutron total scattering data, x-ray absorption fine structure, and patterns of diffuse scattering in electron... [Phys. Rev. B 89, 024106] Published Fri Jan 17, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Supersolid in a one-dimensional model of hard-core bosons (2014)

Tapan Mishra, Ramesh V. Pai, and Subroto Mukerjee

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-01-22

Description: Author(s): Tapan Mishra, Ramesh V. Pai, and Subroto Mukerjee We study a system of hard-core boson on a one-dimensional lattice with frustrated next-nearest-neighbor hopping and nearest-neighbor interaction. At half filling, for equal magnitude of nearest- and next-nearest-neighbor hopping, the ground state of this system exhibits a first-order phase transitio... [Phys. Rev. A 89, 013615] Published Tue Jan 21, 2014

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

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Goldstone modes and bifurcations in phase-separated binary condensates at finite temperature (2014)

Arko Roy, S. Gautam, and D. Angom

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-01-22

Description: Author(s): Arko Roy, S. Gautam, and D. Angom We show that the third Goldstone mode, which emerges in binary condensates at phase separation, persists to higher interspecies interaction for density profiles where one component is surrounded on both sides by the other component. This is not the case with symmetry-broken density profiles where on... [Phys. Rev. A 89, 013617] Published Tue Jan 21, 2014

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

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Ab initio study of the effects of interfacial structure on the ferroelectric, magnetic, and magnetoelectric coupling properties of Fe/BaTiO3 multiferroic tunnel junctions (2014)

Binglun Yin and Shaoxing Qu

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-01-22

Description: Author(s): Binglun Yin and Shaoxing Qu Multiferroic tunnel junctions (MFTJs) are usually composed of two ferromagnetic electrodes and an ultrathin layer of ferroelectric barrier, with many physical properties sensitive to the interfacial details. In Fe/BaTiO3 heterostructures, two types of interfacial atomic configurations were observed ... [Phys. Rev. B 89, 014106] Published Tue Jan 21, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Strongly fluctuating fermionic superfluid in the attractive π-flux Hubbard model (2014)

Ya-Jie Wu, Jiang Zhou, and Su-Peng Kou

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-01-23

Description: Author(s): Ya-Jie Wu, Jiang Zhou, and Su-Peng Kou Ultracold atoms in an optical lattice provide a platform for realization of the superfluid (SF) state, a quantum order with paired charge-neutral fermions. In this paper, we study the SF state in the two-dimensional attractive Hubbard model with π flux on each plaquette. The SF state in the π-flux l... [Phys. Rev. A 89, 013619] Published Wed Jan 22, 2014

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

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Realization of geometric Landau-Zener-Stückelberg interferometry (2014)

Junhua Zhang, Jingning Zhang, Xiang Zhang, and Kihwan Kim

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-01-11

Description: Author(s): Junhua Zhang, Jingning Zhang, Xiang Zhang, and Kihwan Kim We report an experimental realization of the geometric Landau-Zener-Stückelberg (LZS) interferometry proposed by Gasparinetti et al. [Phys. Rev. Lett. 107 , 207002 (2011)PRLTAO10.1103/PhysRevLett.107.207002] in a single-trapped-ion system. Unlike those in a conventional LZS interferometer, the interf... [Phys. Rev. A 89, 013608] Published Fri Jan 10, 2014

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

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Competing superfluid orders in spin-orbit-coupled fermionic cold-atom optical lattices (2014)

Yong Xu, Chunlei Qu, Ming Gong, and Chuanwei Zhang

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-01-11

Description: Author(s): Yong Xu, Chunlei Qu, Ming Gong, and Chuanwei Zhang The Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase, a superconducting state with nonzero total momentum Cooper pairs in a large magnetic field, was first predicted about 50 years ago and has since become an important concept in many branches of physics. Despite an intensive search in various material... [Phys. Rev. A 89, 013607] Published Fri Jan 10, 2014

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

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Ab initio phase stability at high temperatures and pressures in the V-Cr system (2014)

A. Landa, P. Söderlind, and L. H. Yang

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-01-14

Description: Author(s): A. Landa, P. Söderlind, and L. H. Yang The phase stability of vanadium metal and vanadium-chromium alloys at high temperatures and pressures is explored by means of first-principles electronic-structure calculations. Utilizing the self-consistent ab initio lattice dynamics approach in conjunction with density-functional theory, we show t... [Phys. Rev. B 89, 020101] Published Mon Jan 13, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Combinatorial model for the ferroelectric domain-network formation in hexagonal manganites (2014)

Bruno Mettout, Pierre Tolédano, Martin Lilienblum, and Manfred Fiebig

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-01-14

Description: Author(s): Bruno Mettout, Pierre Tolédano, Martin Lilienblum, and Manfred Fiebig As a result of the high-temperature improper ferroelectric transition occurring in YMnO3 and other hexagonal manganites, a striking domain pattern was observed: an emergence of six domains of alternating polarization from one point in a vortexlike pattern. We derive the formation and distribution of... [Phys. Rev. B 89, 024103] Published Mon Jan 13, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Ground state of the double-well condensate for quantum metrology (2014)

Juha Javanainen and Han Chen

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-03-11

Description: Author(s): Juha Javanainen and Han Chen We discuss theoretically the ground state of a Bose-Einstein condensate with attractive atom-atom interactions in a double-well trap as a starting point of Heisenberg-limited atom interferometry. The dimensionless parameter governing the quality of the ground state for this purpose is identified. Th... [Phys. Rev. A 89, 033613] Published Mon Mar 10, 2014

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

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Quantum turbulence by vortex stirring in a spinor Bose-Einstein condensate (2014)

B. Villaseñor, R. Zamora-Zamora, D. Bernal, and V. Romero-Rochín

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-03-11

Description: Author(s): B. Villaseñor, R. Zamora-Zamora, D. Bernal, and V. Romero-Rochín We introduce a mechanism to develop a turbulent flow in a spinor Bose-Einstein condensate, consisting in the stirring of a single line vortex by means of an external magnetic field. We find that density and velocity fluctuations have white-noise power spectra at large frequencies and that the energy... [Phys. Rev. A 89, 033611] Published Mon Mar 10, 2014

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

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Splitting bright matter-wave solitons on narrow potential barriers: Quantum to classical transition and applications to interferometry (2014)

J. L. Helm, S. J. Rooney, Christoph Weiss, and S. A. Gardiner

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-03-11

Description: Author(s): J. L. Helm, S. J. Rooney, Christoph Weiss, and S. A. Gardiner We study bright solitons in the Gross-Pitaevskii equation as they are split and recombined in a low-energy system. We present analytic results determining the general region in which a soliton may not be split on a potential barrier and confirm these results numerically. Furthermore, we analyze the ... [Phys. Rev. A 89, 033610] Published Mon Mar 10, 2014

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

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de Broglie wave-front curvature induced by electric-field gradients and its effect on precision measurements with an atom interferometer (2014)

Ivan Hromada, Raisa Trubko, William F. Holmgren, Maxwell D. Gregoire, and Alexander D. Cronin

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-03-11

Description: Author(s): Ivan Hromada, Raisa Trubko, William F. Holmgren, Maxwell D. Gregoire, and Alexander D. Cronin To improve precision measurements made with atom interferometers, the effect of de Broglie wave-front curvature induced by a lens inside an atom interferometer is experimentally demonstrated and theoretically analyzed. Electrostatic lenses shift, magnify, and distort atom interference fringes, which... [Phys. Rev. A 89, 033612] Published Mon Mar 10, 2014

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

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Structural, elastic, and thermal properties of cementite (Fe3C) calculated using a modified embedded atom method (2014)

Laalitha S. I. Liyanage, Seong-Gon Kim, Jeff Houze, Sungho Kim, Mark A. Tschopp, M. I. Baskes, and M. F. Horstemeyer

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-03-11

Description: Author(s): Laalitha S. I. Liyanage, Seong-Gon Kim, Jeff Houze, Sungho Kim, Mark A. Tschopp, M. I. Baskes, and M. F. Horstemeyer Structural, elastic, and thermal properties of cementite (Fe3C) were studied using a modified embedded atom method (MEAM) potential for iron-carbon (Fe-C) alloys. Previously developed Fe and C single-element potentials were used to develop a Fe-C alloy MEAM potential, using a statistics-based optimi... [Phys. Rev. B 89, 094102] Published Mon Mar 10, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Ab initio (2014)

Pietro Silvi, Tommaso Calarco, Giovanna Morigi, and Simone Montangero

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-03-11

Description: Author(s): Pietro Silvi, Tommaso Calarco, Giovanna Morigi, and Simone Montangero Ions of the same charge inside confining potentials can form crystalline structures which can be controlled by means of the ion density and of the external trap parameters. In particular, a linear chain of trapped ions exhibits a transition to a zigzag equilibrium configuration, which is controlled ... [Phys. Rev. B 89, 094103] Published Mon Mar 10, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Non-180° polarization rotation of ferroelectric (Bi0.5Na0.5)TiO3 single crystals under electric field (2014)

Yuuki Kitanaka, Ken Yanai, Yuji Noguchi, Masaru Miyayama, Yutaka Kagawa, Chikako Moriyoshi, and Yoshihiro Kuroiwa

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-03-11

Description: Author(s): Yuuki Kitanaka, Ken Yanai, Yuji Noguchi, Masaru Miyayama, Yutaka Kagawa, Chikako Moriyoshi, and Yoshihiro Kuroiwa The behavior of the polarization switching by applying electric fields (E) along the 〈100〉 and 〈111〉 directions has been investigated for the single crystals of ferroelectric (Bi0.5Na0.5)TiO3 (BNT) using high-energy synchrotron radiation x-ray diffraction (SR-XRD) and density functional theory (DFT)... [Phys. Rev. B 89, 104104] Published Mon Mar 10, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Microstructure and magnetic disorder induced by nanoindentation in single-crystalline Fe (2014)

Binjun Wang, Yu Gao, and Herbert M. Urbassek

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-03-11

Description: Author(s): Binjun Wang, Yu Gao, and Herbert M. Urbassek Using molecular dynamics simulation, we study nanoindentation into an Fe (100) surface. We use the so-called magnetic interaction potentials provided by Dudarev and Derlet [J. Phys.: Condens. Matter 17, 7097 (2005)] and Chiesa et al. [J. Phys.: Condens. Matter 23, 206001 (2011)] in three different p... [Phys. Rev. B 89, 104105] Published Mon Mar 10, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Signatures of two-level defects in the temperature-dependent damping of nanomechanical silicon nitride resonators (2014)

Thomas Faust, Johannes Rieger, Maximilian J. Seitner, Jörg P. Kotthaus, and Eva M. Weig

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-03-11

Description: Author(s): Thomas Faust, Johannes Rieger, Maximilian J. Seitner, Jörg P. Kotthaus, and Eva M. Weig The damping rates of high quality factor nanomechanical resonators are well beyond intrinsic limits. Here, we explore the underlying microscopic loss mechanisms by investigating the temperature-dependent damping of the fundamental and third harmonic transverse flexural mode of a doubly clamped silic... [Phys. Rev. B 89, 100102] Published Mon Mar 10, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Equilibration and prethermalization in the Bose-Hubbard and Fermi-Hubbard models (2014)

F. Queisser, K. V. Krutitsky, P. Navez, and R. Schützhold

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-03-13

Description: Author(s): F. Queisser, K. V. Krutitsky, P. Navez, and R. Schützhold We study the Bose-Hubbard and Fermi-Hubbard models in the (formal) limit of large coordination numbers Z≫1. Via an expansion into powers of 1/Z, we establish a hierarchy of correlations which facilitates an approximate analytical derivation of the time evolution of the reduced density matrices for o... [Phys. Rev. A 89, 033616] Published Wed Mar 12, 2014

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

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Variational polaron method for Bose-Bose mixtures (2014)

David Benjamin and Eugene Demler

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-03-13

Description: Author(s): David Benjamin and Eugene Demler We study degenerate mixtures of heavy bosons and light superfluid bosons using a variational polaron transformation. We consider the Mott-insulator–superfluid transition of the heavy species and find that at T=0 interaction favors the superfluid phase of the heavy species. Our analytic results agree... [Phys. Rev. A 89, 033615] Published Wed Mar 12, 2014

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

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Uniform spin susceptibility and spin-gap phenomenon in the BCS-BEC-crossover regime of an ultracold Fermi gas (2014)

Hiroyuki Tajima, Takashi Kashimura, Ryo Hanai, Ryota Watanabe, and Yoji Ohashi

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-03-13

Description: Author(s): Hiroyuki Tajima, Takashi Kashimura, Ryo Hanai, Ryota Watanabe, and Yoji Ohashi We investigate the uniform spin susceptibility χs in the BCS (Bardeen-Cooper-Schrieffer)-BEC (Bose-Einstein condensation) crossover regime of an ultracold Fermi gas. Including pairing fluctuations within the framework of an extended T-matrix approximation, we show that χs exhibits nonmonotonic tempe... [Phys. Rev. A 89, 033617] Published Wed Mar 12, 2014

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

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Atomic structure and microstructures of supertetragonal multiferroic BiFeO3 thin films (2014)

F. Pailloux, M. Couillard, S. Fusil, F. Bruno, W. Saidi, V. Garcia, C. Carrétéro, E. Jacquet, M. Bibes, A. Barthélémy, G. A. Botton, and J. Pacaud

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-03-13

Description: Author(s): F. Pailloux, M. Couillard, S. Fusil, F. Bruno, W. Saidi, V. Garcia, C. Carrétéro, E. Jacquet, M. Bibes, A. Barthélémy, G. A. Botton, and J. Pacaud We revisit the atomic structure and microstructure of the so-called supertetragonal phases of highly strained epitaxial BiFeO3 thin films. Quantitative atomic resolution scanning transmission electron microscopy is used to directly image the atomic positions. A crystallographic phase suggested by el... [Phys. Rev. B 89, 104106] Published Wed Mar 12, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Perpetual motion of a mobile impurity in a one-dimensional quantum gas (2014)

O. Lychkovskiy

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-03-14

Description: Author(s): O. Lychkovskiy Consider an impurity particle injected in a degenerate one-dimensional gas of noninteracting fermions (or, equivalently, Tonks-Girardeau bosons) with some initial momentum p0. We examine the infinite-time value of the momentum of the impurity, p∞, as a function of p0. A lower bound on |p∞(p0)| is de... [Phys. Rev. A 89, 033619] Published Thu Mar 13, 2014

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

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Nonlinear polarization waves in a two-component Bose-Einstein condensate (2014)

A. M. Kamchatnov, Y. V. Kartashov, P.-É. Larré, and N. Pavloff

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-03-14

Description: Author(s): A. M. Kamchatnov, Y. V. Kartashov, P.-É. Larré, and N. Pavloff A two-component Bose-Einstein condensate whose dynamics is described by a system of coupled Gross-Pitaevskii equations accommodates waves with different symmetries. A first type of waves corresponds to excitations for which the motion of both components is locally in phase. For the second type of wa... [Phys. Rev. A 89, 033618] Published Thu Mar 13, 2014

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

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Ab initio (2014)

S. Mazevet, V. Recoules, J. Bouchet, F. Guyot, M. Harmand, A. Ravasio, and A. Benuzzi-Mounaix

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-03-14

Description: Author(s): S. Mazevet, V. Recoules, J. Bouchet, F. Guyot, M. Harmand, A. Ravasio, and A. Benuzzi-Mounaix Using ab initio simulations within the generalized gradient approximation, we calculate x-ray absorption near edge spectra (XANES) at the iron K edge throughout the high-pressure phase diagram and up to extreme density and temperature conditions that are representative of the Earth's inner core (up ... [Phys. Rev. B 89, 100103] Published Thu Mar 13, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Ab initio (2014)

A. van de Walle, Q. Hong, L. Miljacic, C. Balaji Gopal, S. Demers, G. Pomrehn, A. Kowalski, and P. Tiwary

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-05-03

Description: Author(s): A. van de Walle, Q. Hong, L. Miljacic, C. Balaji Gopal, S. Demers, G. Pomrehn, A. Kowalski, and P. Tiwary We describe a simple method to determine, from ab initio calculations, the complete orientation dependence of interfacial free energies in solid-state crystalline systems. We illustrate the method with an application to precipitates in the Al-Ti alloy system. The method combines the cluster expansio... [Phys. Rev. B 89, 184101] Published Fri May 02, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Hybrid Boltzmann–Gross-Pitaevskii theory of Bose-Einstein condensation and superfluidity in open driven-dissipative systems (2014)

D. D. Solnyshkov, H. Terças, K. Dini, and G. Malpuech

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-03-21

Description: Author(s): D. D. Solnyshkov, H. Terças, K. Dini, and G. Malpuech We derive a theoretical model which describes Bose-Einstein condensation in an open driven-dissipative system. It includes external pumping of a thermal reservoir, finite lifetime of the condensed particles, and energy relaxation. The coupling between the reservoir and the condensate is described wi... [Phys. Rev. A 89, 033626] Published Thu Mar 20, 2014

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

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Dispersion relation and excitation character of a two-component Bose-Einstein condensate (2014)

Christopher Ticknor

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-05-06

Description: Author(s): Christopher Ticknor We present a study for the dispersion relation and character of the excitations of a single- and two-component Bose-Einstein condensate (BEC). We study the single-component dispersion for a finite BEC system and look at examples of quasiparticles to understand and characterize the dispersion relatio... [Phys. Rev. A 89, 053601] Published Mon May 05, 2014

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

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Three-body bound states in a harmonic waveguide with cylindrical symmetry (2014)

D. Blume

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-05-06

Description: Author(s): D. Blume Highly elongated quasi-one-dimensional cold-atom samples have been studied extensively over the past years experimentally and theoretically. This work determines the energy spectrum of two identical fermions and a third distinguishable particle as functions of the mass ratio κ and the free-space s-w... [Phys. Rev. A 89, 053603] Published Mon May 05, 2014

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

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Comment on “Phase separation in a two-species Bose mixture” (2014)

Fei Zhan and Ian P. McCulloch

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-05-06

Description: Author(s): Fei Zhan and Ian P. McCulloch In an article in 2007, Mishra et al. [Phys. Rev. A 76, 013604 (2007)] investigated the two-component Bose-Hubbard model using the numerical density-matrix renormalization-group procedure. In the regime of interspecies repulsion Uab larger than the intraspecies repulsion U, they found a transition fr... [Phys. Rev. A 89, 057601] Published Mon May 05, 2014

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

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Propagating phase interface with intermediate interfacial phase: Phase field approach (2014)

Kasra Momeni and Valery I. Levitas

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-05-06

Description: Author(s): Kasra Momeni and Valery I. Levitas An advanced three-phase phase field approach (PFA) is suggested for a nonequilibrium phase interface that contains an intermediate phase, in particular, a solid-solid interface with a nanometer-sized intermediate melt (IM). A thermodynamic potential in the polar order parameters is developed that sa... [Phys. Rev. B 89, 184102] Published Mon May 05, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Persistent currents in two-component condensates in a toroidal trap (2014)

M. Abad, A. Sartori, S. Finazzi, and A. Recati

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-05-06

Description: Author(s): M. Abad, A. Sartori, S. Finazzi, and A. Recati The stability of persistent currents in a two-component Bose-Einstein condensate in a toroidal trap is studied in both the miscible and the immiscible regimes. In the miscible regime we show that superflow decay is related to linear instabilities of the spin-density Bogoliubov mode. We find a region... [Phys. Rev. A 89, 053602] Published Mon May 05, 2014

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

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Acute and obtuse rhombohedrons in the local structures of relaxor ferroelectric Pb(Mg1/3Nb2/3)O3 (2014)

Wen Hu, Kouichi Hayashi, Kenji Ohwada, Jun Chen, Naohisa Happo, Shinya Hosokawa, Masamitu Takahasi, Alexei A. Bokov, and Zuo-Guang Ye

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-04-30

Description: Author(s): Wen Hu, Kouichi Hayashi, Kenji Ohwada, Jun Chen, Naohisa Happo, Shinya Hosokawa, Masamitu Takahasi, Alexei A. Bokov, and Zuo-Guang Ye The local structures around Nb and Pb in the prototypical relaxor ferroelectric Pb(Mg1/3Nb2/3)O3 (PMN) were investigated by x-ray fluorescence holography. The separate atomic images of nearest Pb around Nb revealed acute and obtuse rhombohedral structures of the crystal unit cells. The Pb-Pb correla... [Phys. Rev. B 89, 140103] Published Tue Apr 29, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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X-ray absorption spectroscopy of Ru-doped relaxor ferroelectrics with a perovskite-type structure (2014)

T. Vitova, S. Mangold, C. Paulmann, M. Gospodinov, V. Marinova, and B. Mihailova

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-04-30

Description: Author(s): T. Vitova, S. Mangold, C. Paulmann, M. Gospodinov, V. Marinova, and B. Mihailova X-ray absorption near-edge structure and extended x-ray absorption fine structure spectroscopy at the Ru K edge of Ru-doped PbSc0.5Ta0.5O3 (PST-Ru), PbSc0.5Nb0.5O3 (PSN-Ru), and 0.9PbZn1/3Nb2/3O3-0.1PbTiO3 (PZN-0.1PT-Ru) as well as at the Ta L3 edge of PST-Ru and the Nb K edge of PSN-Ru was applied ... [Phys. Rev. B 89, 144112] Published Tue Apr 29, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Rotational properties of two-component Bose gases in the lowest Landau level (2014)

M. L. Meyer, G. J. Sreejith, and S. Viefers

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-05-01

Description: Author(s): M. L. Meyer, G. J. Sreejith, and S. Viefers We study the rotational (yrast) spectra of dilute two-component atomic Bose gases in the low angular momentum regime, assuming equal interspecies and intraspecies interaction. Our analysis employs the composite fermion (CF) approach including a pseudospin degree of freedom. While the CF approach is ... [Phys. Rev. A 89, 043625] Published Wed Apr 30, 2014

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

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Ab initio (2014)

Daniel Cebulla and Ronald Redmer

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-04-25

Description: Author(s): Daniel Cebulla and Ronald Redmer We determined the phase diagram of magnesium oxide with finite-temperature density functional theory molecular dynamics simulations up to temperatures and pressures as relevant for the deep interior of super-Earths and in rocky cores of giant planets such as Jupiter. The equation of state data, the ... [Phys. Rev. B 89, 134107] Published Thu Apr 24, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Acoustic superradiance from an optical-superradiance-induced vortex in a Bose-Einstein condensate (2014)

Nader Ghazanfari and Özgür Esat Müstecaplıoğlu

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-04-25

Description: Author(s): Nader Ghazanfari and Özgür Esat Müstecaplıoğlu We consider the scattering of an acoustic wave from a vortex induced by optical superradiance. The vortex is created by pumping a large amount of angular momentum with a Laguerre-Gaussian light beam in an atomic Bose-Einstein condensate. We derive the mean-field dynamical equations of the light-supe... [Phys. Rev. A 89, 043619] Published Thu Apr 24, 2014

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

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Measuring Z2 topological invariants in optical lattices using interferometry (2014)

F. Grusdt, D. Abanin, and E. Demler

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-04-25

Description: Author(s): F. Grusdt, D. Abanin, and E. Demler We propose an interferometric method to measure Z2 topological invariants of time-reversal invariant topological insulators realized with optical lattices in two and three dimensions. We suggest two schemes which both rely on a combination of Bloch oscillations with Ramsey interferometry and can be ... [Phys. Rev. A 89, 043621] Published Thu Apr 24, 2014

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

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Quench dynamics of isolated many-body quantum systems (2014)

E. J. Torres-Herrera and Lea F. Santos

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-04-25

Description: Author(s): E. J. Torres-Herrera and Lea F. Santos We study isolated quantum systems with two-body interactions after a quench. In these systems, the energy shell is a Gaussian of width σ, and it gives the maximum possible spreading of the energy distribution of the initial states. When the distribution achieves this shape, the fidelity decay can be... [Phys. Rev. A 89, 043620] Published Thu Apr 24, 2014

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

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Controlled formation of metastable germanium polymorphs (2014)

Bianca Haberl, Malcolm Guthrie, Brad D. Malone, Jesse S. Smith, Stanislav V. Sinogeikin, Marvin L. Cohen, James S. Williams, Guoyin Shen, and Jodie E. Bradby

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-04-26

Description: Author(s): Bianca Haberl, Malcolm Guthrie, Brad D. Malone, Jesse S. Smith, Stanislav V. Sinogeikin, Marvin L. Cohen, James S. Williams, Guoyin Shen, and Jodie E. Bradby The nucleation of metastable germanium polymorphs on decompression is studied using in situ synchrotron x-ray diffraction. We show that the transition pathway is critically dependent on the hydrostaticity. Quasihydrostatic conditions result in the nucleation of the rhombohedral r8 phase, followed by... [Phys. Rev. B 89, 144111] Published Fri Apr 25, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Cavity-assisted dynamical spin-orbit coupling in cold atoms (2014)

Lin Dong, Lu Zhou, Biao Wu, B. Ramachandhran, and Han Pu

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-01-25

Description: Author(s): Lin Dong, Lu Zhou, Biao Wu, B. Ramachandhran, and Han Pu We consider ultracold atoms subjected to a cavity-assisted two-photon Raman transition. The Raman coupling gives rise to effective spin-orbit interaction which couples the atom's center-of-mass motion to its pseudospin degrees of freedom. Meanwhile, the cavity photon field is dynamically affected by... [Phys. Rev. A 89, 011602] Published Fri Jan 24, 2014

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

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Dissipative preparation of phase- and number-squeezed states with ultracold atoms (2014)

Roland Cristopher F. Caballar, Sebastian Diehl, Harri Mäkelä, Markus Oberthaler, and Gentaro Watanabe

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-01-25

Description: Author(s): Roland Cristopher F. Caballar, Sebastian Diehl, Harri Mäkelä, Markus Oberthaler, and Gentaro Watanabe We develop a dissipative quantum state preparation scheme for the creation of phase- and number-squeezed states. It utilizes ultracold atoms in a double-well configuration immersed in a background Bose-Einstein condensate, with the latter consisting of an atom species different from the atoms in the... [Phys. Rev. A 89, 013620] Published Fri Jan 24, 2014

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

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Quantum shock waves and population inversion in collisions of ultracold atomic clouds (2014)

Sebastiano Peotta and Massimiliano Di Ventra

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-01-25

Description: Author(s): Sebastiano Peotta and Massimiliano Di Ventra Using a time-dependent density matrix renormalization group (TDMRG) approach we study the collision of one-dimensional atomic clouds confined in a harmonic trap and evolving with the Lieb-Liniger Hamiltonian. It is observed that the motion is essentially periodic with the clouds bouncing elastically... [Phys. Rev. A 89, 013621] Published Fri Jan 24, 2014

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

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Cold Bose atoms around the crossing of quantum waveguides (2014)

A. Markowsky and N. Schopohl

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-01-29

Description: Author(s): A. Markowsky and N. Schopohl We show that massive low-energy particles traversing a branching zone or a crossing of quantum waveguides may experience a nonstandard trapping force that can not be derived from a potential. For interacting cold Bose atoms, we report on the formation of a localized Hartree ground state for three pr... [Phys. Rev. A 89, 013622] Published Mon Jan 27, 2014

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

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Energetics and nucleation of point defects in aluminum under extreme tensile hydrostatic stresses (2014)

Mrinal Iyer, Vikram Gavini, and Tresa M. Pollock

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-01-29

Description: Author(s): Mrinal Iyer, Vikram Gavini, and Tresa M. Pollock Density functional theory calculations are employed to investigate the energetics of point defects—monovacancy, self-interstitials (tetrahedral, octahedral, and dumbbell), and Frenkel pairs—in aluminum under tensile hydrostatic stresses. Our study suggests that the defect core energy of a vacancy, w... [Phys. Rev. B 89, 014108] Published Tue Jan 28, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Tunneling-induced angular momentum for single cold atoms (2014)

R. Menchon-Enrich, S. McEndoo, J. Mompart, V. Ahufinger, and Th. Busch

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-01-30

Description: Author(s): R. Menchon-Enrich, S. McEndoo, J. Mompart, V. Ahufinger, and Th. Busch We study the generation of angular momentum carrying states for a single cold particle by breaking the symmetry of a spatial adiabatic passage process in a two-dimensional system consisting of three harmonic potential wells. By following a superposition of two eigenstates of the system, a single col... [Phys. Rev. A 89, 013626] Published Wed Jan 29, 2014

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

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Nonequilibrium topological phase transitions in two-dimensional optical lattices (2014)

Masaya Nakagawa and Norio Kawakami

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-01-30

Description: Author(s): Masaya Nakagawa and Norio Kawakami Recently, concepts of topological phases of matter are extended to nonequilibrium systems, especially periodically driven systems. In this paper, we construct an example which shows nonequilibrium topological phase transitions using ultracold fermions in optical lattices. We show that the Rabi oscil... [Phys. Rev. A 89, 013627] Published Wed Jan 29, 2014

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

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Turbulence in binary Bose-Einstein condensates generated by highly nonlinear Rayleigh-Taylor and Kelvin-Helmholtz instabilities (2014)

D. Kobyakov, A. Bezett, E. Lundh, M. Marklund, and V. Bychkov

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-02-01

Description: Author(s): D. Kobyakov, A. Bezett, E. Lundh, M. Marklund, and V. Bychkov Quantum turbulence (QT) generated by the Rayleigh-Taylor instability in binary immiscible ultracold 87Rb atoms at zero temperature is studied theoretically. We show that the quantum vortex tangle is qualitatively different from previously considered superfluids, which reveals deep relations between ... [Phys. Rev. A 89, 013631] Published Fri Jan 31, 2014

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

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Landau theory for stress-induced order-disorder transitions in phase change materials (2014)

Matthias Thielen, Razvan A. Nistor, Dmitryi Shakhvorostov, Guillermo Beltramo, Margret Giesen, and Martin H. Müser

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-02-04

Description: Author(s): Matthias Thielen, Razvan A. Nistor, Dmitryi Shakhvorostov, Guillermo Beltramo, Margret Giesen, and Martin H. Müser We propose a Landau theory for phase change materials (PCMs), which describes stress-induced amorphization in vacancy-free, ordered PCMs as a condensation of defects in analogy to equilibrium gas-liquid transitions. Three dimensionless parameters suffice to deduce a highly accurate equation of state... [Phys. Rev. B 89, 054101] Published Mon Feb 03, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Vortex dynamics in spin-orbit-coupled Bose-Einstein condensates (2014)

Alexander L. Fetter

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-02-22

Description: Author(s): Alexander L. Fetter I use a time-dependent Lagrangian formalism and a variational trial function to study the dynamics of a two-component vortex in a spin-orbit-coupled Bose-Einstein condensate (BEC). For a single-component BEC, various experiments have validated this theoretical approach, for example a thermal quench ... [Phys. Rev. A 89, 023629] Published Fri Feb 21, 2014

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

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Peierls distortion, magnetism, and high hardness of manganese tetraboride (2014)

Huiyang Gou, Alexander A. Tsirlin, Elena Bykova, Artem M. Abakumov, Gustaaf Van Tendeloo, Asta Richter, Sergey V. Ovsyannikov, Alexander V. Kurnosov, Dmytro M. Trots, Zuzana Konôpková, Hans-Peter Liermann, Leonid Dubrovinsky, and Natalia Dubrovinskaia

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-02-25

Description: Author(s): Huiyang Gou, Alexander A. Tsirlin, Elena Bykova, Artem M. Abakumov, Gustaaf Van Tendeloo, Asta Richter, Sergey V. Ovsyannikov, Alexander V. Kurnosov, Dmytro M. Trots, Zuzana Konôpková, Hans-Peter Liermann, Leonid Dubrovinsky, and Natalia Dubrovinskaia We report crystal structure, electronic structure, and magnetism of manganese tetraboride, MnB4, synthesized under high-pressure, high-temperature conditions. In contrast to superconducting FeB4 and metallic CrB4, which are both orthorhombic, MnB4 features a monoclinic crystal structure. Its lower s... [Phys. Rev. B 89, 064108] Published Mon Feb 24, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Polarons in a dipolar condensate (2014)

Ben Kain and Hong Y. Ling

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-02-14

Description: Author(s): Ben Kain and Hong Y. Ling We consider a polaronic model in which impurity fermions interact with background bosons in a dipolar condensate. The polaron in this model emerges as an impurity dressed with a cloud of phonons of the dipolar condensate, which, due to the competition between the attractive and repulsive parts of th... [Phys. Rev. A 89, 023612] Published Thu Feb 13, 2014

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

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Defect thermodynamics and kinetics in thin strained ferroelectric films: The interplay of possible mechanisms (2014)

Anna N. Morozovska, Eugene A. Eliseev, P. S. Sankara Rama Krishnan, Alexander Tselev, Evgheny Strelkov, Albina Borisevich, Olexander V. Varenyk, Nicola V. Morozovsky, Paul Munroe, Sergei V. Kalinin, and Valanoor Nagarajan

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-02-14

Description: Author(s): Anna N. Morozovska, Eugene A. Eliseev, P. S. Sankara Rama Krishnan, Alexander Tselev, Evgheny Strelkov, Albina Borisevich, Olexander V. Varenyk, Nicola V. Morozovsky, Paul Munroe, Sergei V. Kalinin, and Valanoor Nagarajan We present a theoretical description of the influence of misfit strain on mobile defects dynamics in thin strained ferroelectric films. Self-consistent solutions obtained by coupling the Poisson's equation for electric potential with continuity equations for mobile donor and electron concentrations ... [Phys. Rev. B 89, 054102] Published Thu Feb 13, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Conductivity of strongly correlated bosons in optical lattices in an Abelian synthetic magnetic field (2014)

A. S. Sajna, T. P. Polak, and R. Micnas

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-02-26

Description: Author(s): A. S. Sajna, T. P. Polak, and R. Micnas Topological phase engineering of neutral bosons loaded in an optical lattice opens a new window for manipulating of transport phenomena in such systems. Exploiting the Bose-Hubbard model and using the magnetic Kubo formula proposed in this paper we show that the optical conductivity abruptly changes... [Phys. Rev. A 89, 023631] Published Mon Feb 24, 2014

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

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Goldstone-mode instability leading to fragmentation in a spinor Bose-Einstein condensate (2014)

Yuki Kawaguchi

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-03-21

Description: Author(s): Yuki Kawaguchi We apply the number-conserving Bogoliubov theory to spinor Bose-Einstein condensates and show that the Goldstone magnon causes instability leading to fragmentation. Unlike the dynamical instability, where modes with complex eigenfrequencies grow exponentially, here the zero-energy mode exhibits alge... [Phys. Rev. A 89, 033627] Published Thu Mar 20, 2014

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

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Electric-field-induced transformations in epitaxial relaxor ferroelectric PbMg1/3Nb2/3O3 films (2014)

M. Tyunina, I. Pintilie, A. Iuga, and L. Pintilie

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-03-25

Description: Author(s): M. Tyunina, I. Pintilie, A. Iuga, and L. Pintilie Electric-field-induced transformations are studied experimentally in cube-on-cube-type epitaxial film of relaxor ferroelectric (FE) PbMg1/3Nb2/3O3 grown on (001) MgO substrate. The dielectric response, polarization, and current are measured along the out-of-plane 〈100〉 direction of the film and anal... [Phys. Rev. B 89, 094106] Published Mon Mar 24, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Optical spectral imaging of a single layer of a quantum gas with an ultranarrow optical transition (2014)

Kosuke Shibata, Ryuta Yamamoto, Yu Seki, and Yoshiro Takahashi

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-03-26

Description: Author(s): Kosuke Shibata, Ryuta Yamamoto, Yu Seki, and Yoshiro Takahashi We demonstrated high-sensitivity optical spectral imaging of a single layer of a quantum gas of ytterbium atoms in a two-dimensional optical lattice using the ultranarrow 1S0-3P2 transition. We successfully obtained a set of excitation-frequency-dependent fluorescence images with an excitation laser... [Phys. Rev. A 89, 031601] Published Tue Mar 25, 2014

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

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Quenched binary Bose-Einstein condensates: Spin-domain formation and coarsening (2014)

S. De, D. L. Campbell, R. M. Price, A. Putra, Brandon M. Anderson, and I. B. Spielman

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-03-26

Description: Author(s): S. De, D. L. Campbell, R. M. Price, A. Putra, Brandon M. Anderson, and I. B. Spielman We explore the time evolution of two-component Bose-Einstein condensates (BECs), quasi one dimensional with respect to their spinor dynamics, following a quench from one component BECs with a U(1) order parameter into two-component condensates with a U(1)×Z2 order parameter. In our case, these two s... [Phys. Rev. A 89, 033631] Published Tue Mar 25, 2014

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

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Topological transitions of interacting bosons in one-dimensional bichromatic optical lattices (2014)

Xiaolong Deng and Luis Santos

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-03-27

Description: Author(s): Xiaolong Deng and Luis Santos Ultracold atoms in one-dimensional (1D) bichromatic optical lattices constitute a surprisingly simple system for the study of topological insulators. We show that bosons in 1D bichromatic lattices present as a general feature the existence, at equal fractional filling, of Mott-insulator phases with ... [Phys. Rev. A 89, 033632] Published Wed Mar 26, 2014

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

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Dynamic stabilization of cubic CaSiO3 perovskite at high temperatures and pressures from ab initio molecular dynamics (2014)

Tao Sun, Dong-Bo Zhang, and Renata M. Wentzcovitch

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-03-27

Description: Author(s): Tao Sun, Dong-Bo Zhang, and Renata M. Wentzcovitch The stability of cubic CaSiO3 perovskite (CaPv) at high temperatures and pressures is investigated by vibrational normal-mode analysis. We compute power spectra of mode autocorrelation functions using a recently developed hybrid approach combining ab initio molecular dynamics with lattice dynamics. ... [Phys. Rev. B 89, 094109] Published Wed Mar 26, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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83

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Unambiguous Gibbs dividing surface for nonequilibrium finite-width interface: Static equivalence approach (2014)

Valery I. Levitas

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-03-27

Description: Author(s): Valery I. Levitas The definition of all properties of the nonequilibrium interface depends on the choice of the position of the dividing surface. However, the definition of its position has been an unsolved problem for more than a century. A missing principle to unambiguously determine the position of the Gibbs' divi... [Phys. Rev. B 89, 094107] Published Wed Mar 26, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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84

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Vector solitons of a Bose-Einstein condensate in a dynamical trap (2014)

Nikolay N. Rosanov

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-03-27

Description: Author(s): Nikolay N. Rosanov Evolution equations are presented and discussed for an atomic Bose-Einstein condensate in a dynamical trap formed by wide oscillating barriers. Their analytical solution reveals the existence of families of bright spatial vector solitons whose components can be in phase and antiphase. [Phys. Rev. A 89, 035601] Published Wed Mar 26, 2014

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

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85

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Nonequilibrium quantum criticality in open systems: The dissipation rate as an additional indispensable scaling variable (2014)

Shuai Yin, Peizhi Mai, and Fan Zhong

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-03-27

Description: Author(s): Shuai Yin, Peizhi Mai, and Fan Zhong We propose that nonequilibrium quantum criticality in open systems under the Born-Markov approximation can be described by a master equation of the Lindblad form. This master equation is derived from a system coupling weakly to a heat bath microscopically and is suggested to provide an approach to s... [Phys. Rev. B 89, 094108] Published Wed Mar 26, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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86

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Light-cone effect and supersonic correlations in one- and two-dimensional bosonic superfluids (2014)

Giuseppe Carleo, Federico Becca, Laurent Sanchez-Palencia, Sandro Sorella, and Michele Fabrizio

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-03-28

Description: Author(s): Giuseppe Carleo, Federico Becca, Laurent Sanchez-Palencia, Sandro Sorella, and Michele Fabrizio We study the spreading of density-density correlations in Bose-Hubbard models after a quench of the interaction strength, using time-dependent variational Monte Carlo simulations. It gives access to unprecedented long propagation times and to dimensions higher than one. In both one and two dimension... [Phys. Rev. A 89, 031602] Published Thu Mar 27, 2014

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

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87

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Mechanisms of the paraelectric to ferroelectric phase transition in RbH2PO4 probed by purely resonant x-ray diffraction (2014)

C. Richter, D. V. Novikov, E. Kh. Mukhamedzhanov, M. M. Borisov, K. A. Akimova, E. N. Ovchinnikova, A. P. Oreshko, J. Strempfer, M. Zschornak, E. Mehner, D. C. Meyer, and V. E. Dmitrienko

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-03-28

Description: Author(s): C. Richter, D. V. Novikov, E. Kh. Mukhamedzhanov, M. M. Borisov, K. A. Akimova, E. N. Ovchinnikova, A. P. Oreshko, J. Strempfer, M. Zschornak, E. Mehner, D. C. Meyer, and V. E. Dmitrienko Resonant x-ray diffraction was used to study the proton jumps in hydrogen-bonded rubidium dihydrogen phosphate (RDP) crystals. In the paraelectric RDP phase, hydrogen is delocalized between two crystallographically equivalent positions. At lower temperatures, this symmetry can be broken, which defin... [Phys. Rev. B 89, 094110] Published Thu Mar 27, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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88

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Spectroscopy for a few atoms harmonically trapped in one dimension (2014)

N. L. Harshman

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-03-29

Description: Author(s): N. L. Harshman Spectroscopic labels for a few particles with spin that are harmonically trapped in one dimension with effectively zero-range interactions are provided by quantum numbers that characterize the symmetries of the Hamiltonian: permutations of identical particles, parity inversion, and the separability ... [Phys. Rev. A 89, 033633] Published Fri Mar 28, 2014

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

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89

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Driven dipole oscillations and the lowest-energy excitations of strongly interacting lattice bosons in a harmonic trap (2014)

K. He, J. Brown, S. Haas, and M. Rigol

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-04-01

Description: Author(s): K. He, J. Brown, S. Haas, and M. Rigol We show that the analysis of the time evolution of the occupation of site and momentum modes of harmonically trapped lattice hard-core bosons, under driven dipole oscillations, allows one to determine the energy of the lowest one-particle excitations of the system in equilibrium. The analytic soluti... [Phys. Rev. A 89, 033634] Published Mon Mar 31, 2014

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

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90

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Correction of dephasing oscillations in matter-wave interferometry (2014)

A. Rembold, G. Schütz, W. T. Chang, A. Stefanov, A. Pooch, I. S. Hwang, A. Günther, and A. Stibor

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-04-01

Description: Author(s): A. Rembold, G. Schütz, W. T. Chang, A. Stefanov, A. Pooch, I. S. Hwang, A. Günther, and A. Stibor Vibrations, electromagnetic oscillations, and temperature drifts are among the main reasons for dephasing in matter-wave interferometry. Sophisticated interferometry experiments, e.g., with ions or heavy molecules, often require integration times of several minutes due to the low source intensity or... [Phys. Rev. A 89, 033635] Published Mon Mar 31, 2014

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

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91

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Split Fermi seas in one-dimensional Bose fluids (2014)

T. Fokkema, I. S. Eliëns, and J.-S. Caux

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-04-01

Description: Author(s): T. Fokkema, I. S. Eliëns, and J.-S. Caux For the one-dimensional repulsive Bose gas (Lieb-Liniger model), we study a special class of highly excited states obtained by giving a finite momentum to subgroups of particles. These states, which correspond to “splitting” the ground-state Fermi-sea-like quantum number configuration, are zero-entr... [Phys. Rev. A 89, 033637] Published Mon Mar 31, 2014

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

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92

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Beating dark-dark solitons and Zitterbewegung in spin-orbit-coupled Bose-Einstein condensates (2014)

V. Achilleos, D. J. Frantzeskakis, and P. G. Kevrekidis

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-04-01

Description: Author(s): V. Achilleos, D. J. Frantzeskakis, and P. G. Kevrekidis We present families of beating dark-dark solitons in spin-orbit (SO) -coupled Bose-Einstein condensates. These families consist of solitons residing simultaneously in the two bands of the energy spectrum. The soliton components are characterized by two different spatial and temporal scales, which ar... [Phys. Rev. A 89, 033636] Published Mon Mar 31, 2014

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

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93

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Intrinsic LiNbO3 point defects from hybrid density functional calculations (2014)

Yanlu Li, W. G. Schmidt, and S. Sanna

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-04-01

Description: Author(s): Yanlu Li, W. G. Schmidt, and S. Sanna The formation energies and charge transition levels of the most relevant LiNbO3 intrinsic point defects, i.e., Nb antisites and Li as well Nb vacancies, are studied from first principles. Thereby isolated defects are modeled in the framework of the density functional theory with local and hybrid exc... [Phys. Rev. B 89, 094111] Published Mon Mar 31, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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94

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Quantum hexatic order in two-dimensional dipolar and charged fluids (2014)

Georg M. Bruun and David R. Nelson

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-04-01

Description: Author(s): Georg M. Bruun and David R. Nelson Recent advances in cold atom experimentation suggest that studies of quantum two-dimensional melting of dipolar molecules, with dipoles aligned perpendicular to ordering plane, may be on the horizon. An intriguing aspect of this problem is that two-dimensional classical aligned dipoles (already stud... [Phys. Rev. B 89, 094112] Published Mon Mar 31, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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95

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Scaling of genuine multiparticle entanglement close to a quantum phase transition (2014)

Martin Hofmann, Andreas Osterloh, and Otfried Gühne

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-04-03

Description: Author(s): Martin Hofmann, Andreas Osterloh, and Otfried Gühne We investigate the scaling and spatial distribution of genuine multiparticle entanglement in three- and four-spin reduced states of the one-dimensional XY model at the quantum phase transition. We observe a logarithmic divergence, show that genuine three- and four-particle entanglement obeys finite-... [Phys. Rev. B 89, 134101] Published Wed Apr 02, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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96

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Chiral selectivity of improper ferroelectricity in single-wall PbTiO3 nanotubes (2014)

Jie Wang, Tao Xu, Takahiro Shimada, Xiaoyuan Wang, Tong-Yi Zhang, and Takayuki Kitamura

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-04-03

Description: Author(s): Jie Wang, Tao Xu, Takahiro Shimada, Xiaoyuan Wang, Tong-Yi Zhang, and Takayuki Kitamura Full density functional theory calculations successfully demonstrate that a remarkable spontaneous polarization can stably exist in extremely thin PbTiO3 single-wall nanotubes (PTO-SWNTs) folded from (110) nanosheets with a specific chirality of (m, 0), whereas ferroelectricity is absent from nanotu... [Phys. Rev. B 89, 144102] Published Wed Apr 02, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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97

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Structure and compressibility of the high-pressure molecular phase II of carbon dioxide (2014)

Frédéric Datchi, Bidyut Mallick, Ashkan Salamat, Gwenaëlle Rousse, Sandra Ninet, Gaston Garbarino, Pierre Bouvier, and Mohamed Mezouar

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-04-03

Description: Author(s): Frédéric Datchi, Bidyut Mallick, Ashkan Salamat, Gwenaëlle Rousse, Sandra Ninet, Gaston Garbarino, Pierre Bouvier, and Mohamed Mezouar The structure and equation of state of the crystalline molecular phase II of carbon dioxide have been investigated at room temperature from 15.5 to 57.5 GPa using synchrotron x-ray diffraction methods. The CO2 samples were embedded in neon pressure medium in order to provide quasihydrostatic conditi... [Phys. Rev. B 89, 144101] Published Wed Apr 02, 2014

Keywords: Structure, structural phase transitions, mechanical properties, defects

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98

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Emergent nontrivial lattices for topological insulators (2014)

O. Dutta, A. Przysiężna, and M. Lewenstein

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-04-04

Description: Author(s): O. Dutta, A. Przysiężna, and M. Lewenstein Materials with nontrivial lattice geometries allow for the creation of exotic states of matter like topologically insulating states. Therefore searching for such materials is an important aspect of current research in solid-state physics. In the field of ultracold gases there are ongoing studies aim... [Phys. Rev. A 89, 043602] Published Thu Apr 03, 2014

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

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99

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Atom-number fluctuation and macroscopic quantum entanglement in dipole spinor condensates (2014)

Yixiao Huang, Zhe Sun, and Xiaoguang Wang

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-04-04

Description: Author(s): Yixiao Huang, Zhe Sun, and Xiaoguang Wang We study the spin distribution and macroscopic entanglement in spinor condensates confined in an anisotropic potential under external magnetic fields. Different types of magnetic phases can be reached by tuning the magnetic dipolar interaction strength by modifying the trapping geometry. We investig... [Phys. Rev. A 89, 043601] Published Thu Apr 03, 2014

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

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100

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Nonequilibrium relaxation transport of ultracold atoms (2014)

Fernando Gallego-Marcos, Gloria Platero, Christian Nietner, Gernot Schaller, and Tobias Brandes

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-09-16

Description: Author(s): Fernando Gallego-Marcos, Gloria Platero, Christian Nietner, Gernot Schaller, and Tobias Brandes We analyze the equilibration process between two either fermionic or bosonic reservoirs containing ultracold atoms with a fixed total number of particles that are weakly connected via a few-level quantum system. We allow for both the temperatures and particle densities of the reservoirs to evolve in... [Phys. Rev. A 90, 033614] Published Mon Sep 15, 2014

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

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