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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

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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

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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

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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

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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

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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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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

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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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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

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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

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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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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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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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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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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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

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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

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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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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

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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

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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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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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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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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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

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Nonexponential fidelity decay in isolated interacting 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: 2014-09-23

Description: Author(s): E. J. Torres-Herrera and Lea F. Santos We study isolated finite interacting quantum systems after an instantaneous perturbation and show three scenarios in which the probability for finding the initial state later in time (fidelity) decays nonexponentially, often all the way to saturation. The decays analyzed involve Gaussian, Bessel of ... [Phys. Rev. A 90, 033623] Published Mon Sep 22, 2014

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Direct probe of topological order for cold atoms (2014)

Dong-Ling Deng, Sheng-Tao Wang, and L.-M. Duan

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-10-07

Description: Author(s): Dong-Ling Deng, Sheng-Tao Wang, and L.-M. Duan Cold-atom experiments in optical lattices offer a versatile platform to realize various topological quantum phases. A key challenge in those experiments is to unambiguously probe the topological order. We propose a method to directly measure the characteristic topological invariants (order) based on... [Phys. Rev. A 90, 041601] Published Mon Oct 06, 2014

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Quantum phases of hard-core dipolar bosons in coupled one-dimensional optical lattices (2014)

A. Safavi-Naini, B. Capogrosso-Sansone, and A. Kuklov

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-10-07

Description: Author(s): A. Safavi-Naini, B. Capogrosso-Sansone, and A. Kuklov Hard-core dipolar bosons trapped in a parallel stack of N≥2 one-dimensional optical lattices (tubes) can develop several phases made of composites of particles from different tubes: superfluids, supercounterfluids, and insulators as well as mixtures of those. Bosonization analysis shows that these p... [Phys. Rev. A 90, 043604] Published Mon Oct 06, 2014

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Chandrasekhar-Clogston limit and critical polarization in a Fermi-Bose superfluid mixture (2014)

Tomoki Ozawa, Alessio Recati, Marion Delehaye, Frédéric Chevy, and Sandro Stringari

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-10-09

Description: Author(s): Tomoki Ozawa, Alessio Recati, Marion Delehaye, Frédéric Chevy, and Sandro Stringari We study mixtures of a population-imbalanced, strongly interacting Fermi gas and of a Bose-Einstein condensed gas at zero temperature. In the homogeneous case, we find that the Chandrasekhar-Clogston critical polarization for the onset of instability of Fermi superfluidity is enhanced due to the int... [Phys. Rev. A 90, 043608] Published Wed Oct 08, 2014

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Theory of two-particle emission from superfluid Fermi gases in the BCS-BEC crossover (2014)

Emiko Arahata and Tetsuro Nikuni

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-10-02

Description: Author(s): Emiko Arahata and Tetsuro Nikuni A new way of measuring pair correlations in a system of ultracold fermions in the BCS-BEC crossover is suggested, employing a process analogous to double photoemission known from solid-state physics. [Phys. Rev. A 90, 043601] Published Wed Oct 01, 2014

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Polaron formation in the vicinity of a narrow Feshbach resonance (2014)

W. Casteels and M. Wouters

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-10-04

Description: Author(s): W. Casteels and M. Wouters The polaronic system consisting of an impurity in a dilute Bose-Einstein condensate is considered in the presence of a narrow Feshbach resonance. For this purpose a coupled-channel model is used, which at the mean-field level predicts the formation of quasiparticles that are a superposition of the i... [Phys. Rev. A 90, 043602] Published Fri Oct 03, 2014

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Dynamical robustness of the conductivity of ultracold bosons confined in layered structures (2014)

A. S. Sajna and T. P. Polak

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-10-07

Description: Author(s): A. S. Sajna and T. P. Polak We study dynamical conductivity of strongly correlated bosons loaded in an optical lattice with restricted geometry in which gauge fields are present. We show that dynamics influenced by the uniform synthetic magnetic field combined with layered lattice structures changes into rich insulator-metalli... [Phys. Rev. A 90, 043603] Published Mon Oct 06, 2014

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Dynamics of localized waves in one-dimensional random potentials: Statistical theory of the coherent forward scattering peak (2014)

Kean Loon Lee (李健伦), Benoît Grémaud, and Christian Miniatura

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-10-08

Description: Author(s): Kean Loon Lee (李健伦), Benoît Grémaud, and Christian Miniatura As recently discovered [T. Karpiuk et al. , Phys. Rev. Lett. 109 , 190601 (2012)PRLTAO10.1103/PhysRevLett.109.190601], Anderson localization in a bulk disordered system triggers the emergence of a coherent forward scattering (CFS) peak in momentum space, which twins the well-known coherent backscatter... [Phys. Rev. A 90, 043605] Published Tue Oct 07, 2014

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Bound states and expansion dynamics of interacting bosons on a one-dimensional lattice (2014)

Cristian Degli Esposti Boschi, Elisa Ercolessi, Loris Ferrari, Piero Naldesi, Fabio Ortolani, and Luca Taddia

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-10-08

Description: Author(s): Cristian Degli Esposti Boschi, Elisa Ercolessi, Loris Ferrari, Piero Naldesi, Fabio Ortolani, and Luca Taddia The expansion dynamics of bosonic gases in optical lattices has recently been the focus of increasing attention, both experimental and theoretical. We consider, by means of numerical Bethe ansatz, the expansion dynamics of initially confined wave packets of two interacting bosons on a lattice. We sh... [Phys. Rev. A 90, 043606] Published Tue Oct 07, 2014

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Dipolar atomic spin ensembles in a double-well potential (2014)

A. de Paz, B. Naylor, J. Huckans, A. Carrance, O. Gorceix, E. Maréchal, P. Pedri, B. Laburthe-Tolra, and L. Vernac

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-10-09

Description: Author(s): A. de Paz, B. Naylor, J. Huckans, A. Carrance, O. Gorceix, E. Maréchal, P. Pedri, B. Laburthe-Tolra, and L. Vernac We experimentally study the spin dynamics of mesoscopic ensembles of ultracold magnetic spin-3 atoms located in two separated wells of an optical dipole trap. We use a radio-frequency sweep to selectively flip the spin of the atoms in one of the wells, which produces two separated spin domains of op... [Phys. Rev. A 90, 043607] Published Wed Oct 08, 2014

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Matter-wave Fourier optics with a strongly interacting two-dimensional Fermi gas (2014)

P. A. Murthy, D. Kedar, T. Lompe, M. Neidig, M. G. Ries, A. N. Wenz, G. Zürn, and S. Jochim

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-10-11

Description: Author(s): P. A. Murthy, D. Kedar, T. Lompe, M. Neidig, M. G. Ries, A. N. Wenz, G. Zürn, and S. Jochim We demonstrate and characterize an experimental technique to directly image the momentum distribution of a strongly interacting two-dimensional quantum gas with high momentum resolution. We apply the principles of Fourier optics to investigate three main operations on the expanding gas: focusing, co... [Phys. Rev. A 90, 043611] Published Fri Oct 10, 2014

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Dynamics in asymmetric double-well condensates (2014)

H. M. Cataldo and D. M. Jezek

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-10-11

Description: Author(s): H. M. Cataldo and D. M. Jezek The dynamics of Bose-Einstein condensates in asymmetric double wells is studied. We construct a two-mode model and analyze the properties of the corresponding phase-space diagram, showing in particular that the minimum of the phase-space portrait becomes shifted from the origin as a consequence of t... [Phys. Rev. A 90, 043610] Published Fri Oct 10, 2014

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Theory of bosons in two-leg ladders with large magnetic fields (2014)

Ran Wei and Erich J. Mueller

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-06-25

Description: Author(s): Ran Wei and Erich J. Mueller We calculate the ground state of a Bose gas trapped on a two-leg ladder where Raman-induced hopping mimics the effect of a large magnetic field. In the mean-field limit, where there are large numbers of particles per site, this maps onto a uniformly frustrated two-leg ladder classical spin model. Th... [Phys. Rev. A 89, 063617] Published Tue Jun 24, 2014

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Single-particle versus pair superfluidity in a bilayer system of dipolar bosons (2014)

A. Macia, G. E. Astrakharchik, F. Mazzanti, S. Giorgini, and J. Boronat

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-10-22

Description: Author(s): A. Macia, G. E. Astrakharchik, F. Mazzanti, S. Giorgini, and J. Boronat We consider the ground state of a bilayer system of dipolar bosons, where dipoles are oriented by an external field in the direction perpendicular to the parallel planes. Quantum Monte Carlo methods are used to calculate the ground-state energy, the one-body and two-body density matrix, and the supe... [Phys. Rev. A 90, 043623] Published Tue Oct 21, 2014

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Atom-dimer scattering and stability of Bose and Fermi mixtures (2014)

Xiaoling Cui

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-10-22

Description: Author(s): Xiaoling Cui Motivated by a recent experiment by the Ecole Normale Supérieure de Lyon (ENS) group on the mixture of Bose and Fermi superfluids [I. Ferrier-Barbut et al. , Science 345 , 1035 (2014)10.1126/science.1255380], we investigate the effective scattering between a bosonic atom and a molecule (dimer) of fer... [Phys. Rev. A 90, 041603] Published Tue Oct 21, 2014

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Heteropairing and component-dependent pseudogap phenomena in an ultracold Fermi gas with different species with different masses (2014)

Ryo Hanai and Yoji Ohashi

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-10-22

Description: Author(s): Ryo Hanai and Yoji Ohashi We investigate the superfluid phase transition and single-particle excitations in the BCS (Bardeen-Cooper-Schrieffer)-BEC (Bose-Einstein condensation) crossover regime of an unpolarized ultracold Fermi gas with mass imbalance (where two different species contributing to Cooper pairs have different a... [Phys. Rev. A 90, 043622] Published Tue Oct 21, 2014

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Flat-band ferromagnetism in the multilayer Lieb optical lattice (2014)

Kazuto Noda, Kensuke Inaba, and Makoto Yamashita

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-10-22

Description: Author(s): Kazuto Noda, Kensuke Inaba, and Makoto Yamashita We theoretically study magnetic properties of two-component cold fermions in half-filled multilayer Lieb optical lattices, i.e., two, three, and several layers, using the dynamical mean-field theory. We clarify that the magnetic properties of this system become quite different depending on whether t... [Phys. Rev. A 90, 043624] Published Tue Oct 21, 2014

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Quench between a Mott insulator and a Lieb-Liniger liquid (2014)

Garry Goldstein and Natan Andrei

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-10-24

Description: Author(s): Garry Goldstein and Natan Andrei In this work we study a quench between a Mott insulator and a repulsive Lieb-Liniger liquid. We explicitly find the stationary state when a long time has passed after the quench. It is given by a generalized Gibbs ensemble (GGE) density matrix, which we completely characterize, calculating the quasi... [Phys. Rev. A 90, 043626] Published Thu Oct 23, 2014

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Failure of the local generalized Gibbs ensemble for integrable models with bound states (2014)

Garry Goldstein and Natan Andrei

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-10-24

Description: Author(s): Garry Goldstein and Natan Andrei In this work we study the applicability of the local generalized Gibbs ensemble (GGE) to integrable one-dimensional systems with bound states. We find that the GGE, when defined using only local conserved quantities, fails to describe the long-time dynamics for most initial states, including eigenst... [Phys. Rev. A 90, 043625] Published Thu Oct 23, 2014

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Quantum magnetism of ultracold atoms with a dynamical pseudospin degree of freedom (2014)

Tobias Graß, Alessio Celi, and Maciej Lewenstein

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-10-24

Description: Author(s): Tobias Graß, Alessio Celi, and Maciej Lewenstein We consider bosons in a Hubbard lattice with an SU(N) pseudospin degree of freedom which is made dynamical via a coherent transfer term. It is shown that, in the basis which diagonalizes the pseudospin coupling, a generic hopping process affects the spin state, similarly to a spin-orbit coupling. Th... [Phys. Rev. A 90, 043628] Published Thu Oct 23, 2014

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Universal and nonuniversal effective N-body interactions for ultracold harmonically trapped few-atom systems (2014)

X. Y. Yin, D. Blume, P. R. Johnson, and E. Tiesinga

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-10-29

Description: Author(s): X. Y. Yin, D. Blume, P. R. Johnson, and E. Tiesinga The ground-state energy for a small number of ultracold atoms in an isotropic harmonic trap was derived using effective quantum field theory and the nonuniversal effective three-body contribution to the energy was calculated. [Phys. Rev. A 90, 043631] Published Tue Oct 28, 2014

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Measuring the heat capacity in a Bose-Einstein condensation using global variables (2014)

R. F. Shiozaki, G. D. Telles, P. Castilho, F. J. Poveda-Cuevas, S. R. Muniz, G. Roati, V. Romero-Rochin, and V. S. Bagnato

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-11-01

Description: Author(s): R. F. Shiozaki, G. D. Telles, P. Castilho, F. J. Poveda-Cuevas, S. R. Muniz, G. Roati, V. Romero-Rochin, and V. S. Bagnato Phase transitions are well understood and generally followed by the behavior of the associated thermodynamic quantities, such as in the case of the λ-point superfluid transition of liquid He, which is observed in its heat capacity. In the case of a trapped Bose-Einstein condensate, the heat capacity... [Phys. Rev. A 90, 043640] Published Fri Oct 31, 2014

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Phase diffusion in a Bose-Einstein condensate of light (2014)

A.-W. de Leeuw, E. C. I. van der Wurff, R. A. Duine, and H. T. C. Stoof

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-10-24

Description: Author(s): A.-W. de Leeuw, E. C. I. van der Wurff, R. A. Duine, and H. T. C. Stoof We study phase diffusion in a Bose–Einstein condensate of light in a dye-filled optical microcavity, i.e., the spreading of the probability distribution for the condensate phase. To observe this phenomenon, we propose an interference experiment between the condensed photons and an external laser. We... [Phys. Rev. A 90, 043627] Published Thu Oct 23, 2014

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Pairing correlations of cold fermionic gases at overflow from a narrow to a wide harmonic trap (2014)

A. Pastore, P. Schuck, M. Urban, X. Viñas, and J. Margueron

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-10-30

Description: Author(s): A. Pastore, P. Schuck, M. Urban, X. Viñas, and J. Margueron Within the context of Hartree-Fock-Bogoliubov theory, we study the behavior of superfluid Fermi systems when they pass from a small to a large container. Such systems can be now realized thanks to recent progress in experimental techniques. It will allow researchers to better understand pairing prop... [Phys. Rev. A 90, 043634] Published Wed Oct 29, 2014

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Three-body parameter for Efimov states in Li6 (2014)

Bo Huang (黄博), Kenneth M. O'Hara, Rudolf Grimm, Jeremy M. Hutson, and Dmitry S. Petrov

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-10-31

Description: Author(s): Bo Huang (黄博), Kenneth M. O'Hara, Rudolf Grimm, Jeremy M. Hutson, and Dmitry S. Petrov A model for finite-temperature effects on three-body recombination in Efimov systems is presented and used to determine the three-body parameter for fermionic lithium-6, which may serve as a basis for future measurements in different systems in a search for nonuniversality in Efimov physics in atomic systems. [Phys. Rev. A 90, 043636] Published Thu Oct 30, 2014

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Thermalization in closed quantum systems: Semiclassical approach (2014)

J. G. Cosme and O. Fialko

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-11-04

Description: Author(s): J. G. Cosme and O. Fialko Thermalization in closed quantum systems can be understood either by means of the eigenstate thermalization hypothesis or the concept of canonical typicality. Both concepts are based on quantum-mechanical formalism, such as spectral properties of the eigenstates or entanglement between subsystems, r... [Phys. Rev. A 90, 053602] Published Mon Nov 03, 2014

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Resonant extended states in driven quasiperiodic lattices: Aubry-Andre localization by design (2014)

L. Morales-Molina, E. Doerner, C. Danieli, and S. Flach

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-10-29

Description: Author(s): L. Morales-Molina, E. Doerner, C. Danieli, and S. Flach We consider a quasiperiodic Aubry-Andre (AA) model and add a weak time-space-periodic perturbation. The undriven AA model is chosen to be well in the localized regime. The driving term controls the effective number of propagation channels. For a spatial resonance which reduces the reciprocal space d... [Phys. Rev. A 90, 043630] Published Tue Oct 28, 2014

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

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Second-order fluid dynamics for the unitary Fermi gas from kinetic theory (2014)

Thomas Schäfer

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-10-30

Description: Author(s): Thomas Schäfer We compute second-order transport coefficients of the dilute Fermi gas at unitarity. The calculation is based on kinetic theory and the Boltzmann equation at second order in the Knudsen expansion. The second-order transport coefficients describe the shear stress relaxation time, nonlinear terms in t... [Phys. Rev. A 90, 043633] Published Wed Oct 29, 2014

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

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Directed motion of doublons and holes in periodically driven Mott insulators (2014)

Maximilian Genske and Achim Rosch

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-10-31

Description: Author(s): Maximilian Genske and Achim Rosch Periodically driven systems can lead to a directed motion of particles. We investigate this ratchet effect for a bosonic Mott insulator where both a staggered hopping and a staggered local potential vary periodically in time. If driving frequencies are smaller than the interaction strength and the d... [Phys. Rev. A 90, 043637] Published Thu Oct 30, 2014

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

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Quantum phases of dipolar soft-core bosons (2014)

D. Grimmer, A. Safavi-Naini, B. Capogrosso-Sansone, and Ş. G. Söyler

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-10-31

Description: Author(s): D. Grimmer, A. Safavi-Naini, B. Capogrosso-Sansone, and Ş. G. Söyler We study the phase diagram of a system of soft-core dipolar bosons confined to a two-dimensional optical lattice layer. We assume that dipoles are aligned perpendicular to the layer such that the dipolar interactions are purely repulsive and isotropic. We consider the full dipolar interaction and pe... [Phys. Rev. A 90, 043635] Published Thu Oct 30, 2014

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

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Approach for making visible and stable stripes in a spin-orbit-coupled Bose-Einstein superfluid (2014)

Giovanni I. Martone, Yun Li, and Sandro Stringari

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-11-01

Description: Author(s): Giovanni I. Martone, Yun Li, and Sandro Stringari The striped phase exhibited by a spin-1/2 Bose-Einstein condensate with spin-orbit coupling is characterized by the spontaneous breaking of two continuous symmetries: gauge and translational symmetry. This is a peculiar feature of supersolids and is the consequence of interaction effects. We propose... [Phys. Rev. A 90, 041604] Published Fri Oct 31, 2014

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

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Validating simple dynamical simulations of the unitary Fermi gas (2014)

Michael McNeil Forbes and Rishi Sharma

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-11-01

Description: Author(s): Michael McNeil Forbes and Rishi Sharma We present a comparison between simulated dynamics of the unitary fermion gas using the superfluid local density approximation (SLDA) and a simplified bosonic model, the extended Thomas-Fermi (ETF) with a unitary equation of state. Small-amplitude fluctuations have similar dynamics in both theories ... [Phys. Rev. A 90, 043638] Published Fri Oct 31, 2014

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

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Negative refraction of excitations in the Bose-Hubbard model (2014)

R. A. Henry, J. Q. Quach, C.-H. Su, A. D. Greentree, and A. M. Martin

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-11-01

Description: Author(s): R. A. Henry, J. Q. Quach, C.-H. Su, A. D. Greentree, and A. M. Martin Ultracold atoms in optical lattices provide a unique opportunity to study Bose-Hubbard physics. In this work we show that by considering a spatially varying on-site interaction it is possible to manipulate the motion of excitations above the Mott phase in a Bose-Hubbard system. Specifically, we show... [Phys. Rev. A 90, 043639] Published Fri Oct 31, 2014

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

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Domain walls and bubble droplets in immiscible binary Bose gases (2014)

G. Filatrella, Boris A. Malomed, and Mario Salerno

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-10-25

Description: Author(s): G. Filatrella, Boris A. Malomed, and Mario Salerno The existence and stability of domain walls (DWs) and bubble-droplet (BD) states in binary mixtures of quasi-one-dimensional ultracold Bose gases with inter- and intraspecies repulsive interactions is considered. Previously, DWs were studied by means of coupled systems of Gross-Pitaevskii equations ... [Phys. Rev. A 90, 043629] Published Fri Oct 24, 2014

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

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Ring model for trapped condensates with synthetic spin-orbit coupling (2014)

Xing Chen, Michael Rabinovic, Brandon M. Anderson, and Luis Santos

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-10-30

Description: Author(s): Xing Chen, Michael Rabinovic, Brandon M. Anderson, and Luis Santos We derive an effective ring model in momentum space for trapped bosons with synthetic spin-orbit coupling. This effective model is characterized by a peculiar form of the interparticle interactions, which is crucially modified by the external confinement. The ring model allows for an intuitive under... [Phys. Rev. A 90, 043632] Published Wed Oct 29, 2014

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

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Spin-orbit-coupled topological Fulde-Ferrell states of fermions in a harmonic trap (2014)

Lei Jiang, Eite Tiesinga, Xia-Ji Liu, Hui Hu, and Han Pu

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-11-08

Description: Author(s): Lei Jiang, Eite Tiesinga, Xia-Ji Liu, Hui Hu, and Han Pu Motivated by recent experimental breakthroughs in generating spin-orbit coupling in ultracold Fermi gases using Raman laser beams, we present a systematic study of spin-orbit-coupled Fermi gases confined in a quasi-one-dimensional trap in the presence of an in-plane Zeeman field (which can be realiz... [Phys. Rev. A 90, 053606] Published Fri Nov 07, 2014

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

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Equation of state and phase transition in spin-orbit-coupled Bose gases at finite temperature: A perturbation approach (2014)

Zeng-Qiang Yu

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-11-08

Description: Author(s): Zeng-Qiang Yu We study two-component Bose gases with Raman induced spin-orbit coupling via a perturbation approach at finite temperature. For weak coupling, free energy is expanded in terms of Raman coupling strength up to the second order, where the coefficient (referred to as Raman susceptibility) is determined... [Phys. Rev. A 90, 053608] Published Fri Nov 07, 2014

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

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Absence of quasiclassical coherence in mean-field dynamics of bosons in a kinetically frustrated regime (2014)

Akos Rapp

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-11-08

Description: Author(s): Akos Rapp We study numerically the dynamics of bosons on a triangular lattice after quenching both the on-site interactions and the external trapping potential to negative values. In a similar situation on the square lattice, the dynamics can be understood in terms of an effectively reversed Hamiltonian. On t... [Phys. Rev. A 90, 053607] Published Fri Nov 07, 2014

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

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Modulated trapping of interacting bosons in one dimension (2014)

Eoin Quinn and Masudul Haque

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-11-08

Description: Author(s): Eoin Quinn and Masudul Haque We investigate the response of harmonically confined bosons with contact interactions (trapped Lieb-Liniger gas) to modulations of the trapping strength. We explain the structure of resonances at a series of driving frequencies, where size oscillations and energy grow exponentially. For strong inter... [Phys. Rev. A 90, 053609] Published Fri Nov 07, 2014

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

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Matter-wave scattering from interacting bosons in an optical lattice (2014)

Klaus Mayer, Alberto Rodriguez, and Andreas Buchleitner

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-08-26

Description: Author(s): Klaus Mayer, Alberto Rodriguez, and Andreas Buchleitner We study the scattering of matter waves from interacting bosons in a one-dimensional optical lattice, described by the Bose-Hubbard Hamiltonian. We derive analytically a formula for the inelastic cross section as a function of the atomic interaction in the lattice, employing Bogoliubov's formalism f... [Phys. Rev. A 90, 023629] Published Mon Aug 25, 2014

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

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Proper phase imprinting method for a dark soliton excitation in a superfluid Fermi mixture (2014)

Krzysztof Sacha and Dominique Delande

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2014-08-27

Description: Author(s): Krzysztof Sacha and Dominique Delande A novel method to create a dark soliton in fermionic superfluids is presented by phase imprinting a single component of the Fermi mixture instead of the usual method of using both components. [Phys. Rev. A 90, 021604] Published Tue Aug 26, 2014

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

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