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

Bettina Gertjerenken and Christoph Weiss

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-07

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

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

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

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-12

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

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

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

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-12

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

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

Bernhard M. Breid and James R. Anglin

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-17

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

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

Ovidiu I. Pâţu and Andreas Klümper

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-20

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

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

Piotr Stępnicki and Michał Matuszewski

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-24

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

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

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

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-24

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

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

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Demixing in symmetric supersolid mixtures (2013)

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

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-27

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

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

Emi Yukawa, Masahito Ueda, and Kae Nemoto

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-27

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

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Transverse spin diffusion in strongly interacting Fermi gases (2013)

Tilman Enss

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-28

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

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

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

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-10-01

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

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

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

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

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-10

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

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

Hakan Atakişi and M. Ö. Oktel

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-11

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

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Backscattering echo of correlated wave packets (2013)

Nicolas Cherroret and Dominique Delande

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-13

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

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

Ben Kain and Hong Y. Ling

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-17

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

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

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

Francesco Ancilotto, Maurizio Rossi, and Flavio Toigo

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-17

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

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

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

Moumita Gupta and Krishna Rai Dastidar

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-18

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

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Excitation spectrum of a toroidal spin-1 Bose-Einstein condensate (2013)

H. Mäkelä and E. Lundh

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-20

Description: Author(s): H. Mäkelä and E. Lundh We calculate analytically the Bogoliubov excitation spectrum of a toroidal spin-1 Bose-Einstein condensate that is subjected to a homogeneous magnetic field and contains vortices with arbitrary winding numbers in the m F =±1 components of the hyperfine spin. We show that a rotonlike spectrum can be ob... [Phys. Rev. A 88, 033622] Published Thu Sep 19, 2013

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First-order phase transition and anomalous hysteresis of Bose gases in optical lattices (2013)

Daisuke Yamamoto, Takeshi Ozaki, Carlos A. R. Sá de Melo, and Ippei Danshita

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-21

Description: Author(s): Daisuke Yamamoto, Takeshi Ozaki, Carlos A. R. Sá de Melo, and Ippei Danshita We study the first-order quantum phase transitions of Bose gases in optical lattices. A special emphasis is placed on an anomalous hysteresis behavior, in which the phase transition occurs in a unidirectional way and a hysteresis loop does not form. We first revisit the hardcore Bose-Hubbard model w... [Phys. Rev. A 88, 033624] Published Fri Sep 20, 2013

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Absence of damping of low-energy excitations in a quasi-two-dimensional dipolar Bose gas (2013)

Stefan S. Natu and S. Das Sarma

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-26

Description: Author(s): Stefan S. Natu and S. Das Sarma We develop a theory of damping of low-energy, collective excitations in a quasi-two-dimensional, homogenous, dipolar Bose gas at zero temperature, via processes whereby an excitation decays into two excitations with lower energy. We find that owing to the nature of the low-energy spectrum of a quasi... [Phys. Rev. A 88, 031604] Published Wed Sep 25, 2013

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Compact atomic gravimeter based on a pulsed and accelerated optical lattice (2013)

Manuel Andia, Raphaël Jannin, François Nez, François Biraben, Saïda Guellati-Khélifa, and Pierre Cladé

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-26

Description: Author(s): Manuel Andia, Raphaël Jannin, François Nez, François Biraben, Saïda Guellati-Khélifa, and Pierre Cladé We present a scheme of a compact atomic gravimeter based on atom interferometry. Atoms are maintained against gravity using a sequence of coherent accelerations performed by the Bloch oscillations technique. We demonstrate a sensitivity of 4.8×10 −8 with an integration time of 4 min. Combining this m... [Phys. Rev. A 88, 031605] Published Wed Sep 25, 2013

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Self-trapping in the two-dimensional Bose-Hubbard model (2013)

Andrew Jreissaty, Juan Carrasquilla, and Marcos Rigol

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-10-01

Description: Author(s): Andrew Jreissaty, Juan Carrasquilla, and Marcos Rigol We study the expansion of harmonically trapped bosons in a two-dimensional lattice after suddenly turning off the confining potential. We show that, in the presence of multiple occupancies per lattice site and strong interactions, the system exhibits a clear dynamical separation into slowly and rapi... [Phys. Rev. A 88, 031606] Published Mon Sep 30, 2013

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Quantum breathing dynamics of ultracold bosons in one-dimensional harmonic traps: Unraveling the pathway from few- to many-body systems (2013)

Rüdiger Schmitz, Sven Krönke, Lushuai Cao, and Peter Schmelcher

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-10-03

Description: Author(s): Rüdiger Schmitz, Sven Krönke, Lushuai Cao, and Peter Schmelcher Following a “bottom-up approach” in understanding many-particle effects and dynamics we provide a systematic ab initio study of the dependence of the breathing dynamics of ultracold bosons in a one-dimensional (1D) harmonic trap on the number of bosons ranging from few to many. To this end, we emplo... [Phys. Rev. A 88, 043601] Published Wed Oct 02, 2013

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Distortion of interference fringes and the resulting vortex production of merging Bose-Einstein condensates (2013)

Bo Xiong, Tao Yang, and Keith A. Benedict

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-10-04

Description: Author(s): Bo Xiong, Tao Yang, and Keith A. Benedict We investigate the effects of interatomic interactions and expansion on the distortion of interference fringes of a pair of initially well-separated, but coherent, condensate clouds trapped in a harmonic trap. The distortion of interference fringes, which can lead to the spontaneous formation of vor... [Phys. Rev. A 88, 043602] Published Thu Oct 03, 2013

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Stability and collapse of fermions in a binary dipolar boson-fermion ^{164}Dy-^{161}Dy mixture (2013)

S. K. Adhikari

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-10-04

Description: Author(s): S. K. Adhikari We suggest a time-dependent mean-field hydrodynamic model for a binary dipolar boson-fermion mixture to study the stability and collapse of fermions in the 164 Dy- 161 Dy mixture. The condition of stability of the dipolar mixture is illustrated in terms of phase diagrams. A collapse is induced in a dis... [Phys. Rev. A 88, 043603] Published Thu Oct 03, 2013

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Ground state of a two-component dipolar Fermi gas in a harmonic potential (2013)

Przemyslaw Bienias, Krzysztof Pawłowski, Tilman Pfau, and Kazimierz Rzążewski

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-10-05

Description: Author(s): Przemyslaw Bienias, Krzysztof Pawłowski, Tilman Pfau, and Kazimierz Rzążewski Interacting two-component Fermi gases are at the heart of our understanding of macroscopic quantum phenomena such as superconductivity. The changing nature of the interaction is expected to head to novel quantum phases. Here we study the ground state of a two-component fermionic gas in a harmonic po... [Phys. Rev. A 88, 043604] Published Fri Oct 04, 2013

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Mesoscopic dipolar quantum crystals (2013)

Massimo Boninsegni

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-06-06

Description: Author(s): Massimo Boninsegni The ground state of a two-dimensional, harmonically confined mesoscopic assembly of up to 30 polar molecules is studied by computer simulations. As the strength of the confining trap is increased, clusters evolve from superfluid, to supersolid, to insulating crystals. For strong confinement, the cry... [Phys. Rev. A 87, 063604] Published Wed Jun 05, 2013

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Elementary excitations of ultracold soft-core bosons across the superfluid-supersolid phase transition (2013)

T. Macrì, F. Maucher, F. Cinti, and T. Pohl

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-06-12

Description: Author(s): T. Macrì, F. Maucher, F. Cinti, and T. Pohl We investigate the zero-temperature excitation spectrum of two-dimensional soft-core bosons for a wide range of parameters and across the phase transition from a superfluid to a supersolid state. Based on mean-field calculations and recent quantum Monte Carlo results, we demonstrate the applicabilit... [Phys. Rev. A 87, 061602] Published Tue Jun 11, 2013

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Exotic pairing states in a Fermi gas with three-dimensional spin-orbit coupling (2013)

Xiang-Fa Zhou, Guang-Can Guo, Wei Zhang, and Wei Yi

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-06-07

Description: Author(s): Xiang-Fa Zhou, Guang-Can Guo, Wei Zhang, and Wei Yi We investigate properties of exotic pairing states in a three-dimensional Fermi gas with three-dimensional spin-orbit coupling and an effective Zeeman field. The interplay of spin-orbit coupling, effective Zeeman field, and pairing can lead to first-order phase transitions between different phases, ... [Phys. Rev. A 87, 063606] Published Thu Jun 06, 2013

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

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Orbital coupled dipolar fermions in an asymmetric optical ladder (2013)

Xiaopeng Li and W. Vincent Liu

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-06-06

Description: Author(s): Xiaopeng Li and W. Vincent Liu We study a quantum ladder of interacting fermions with coupled s and p orbitals. Such a model describes dipolar molecules or atoms loaded into a double-well optical lattice, dipole moments being aligned by an external field. The two orbital components have distinct hoppings. The tunneling between th... [Phys. Rev. A 87, 063605] Published Wed Jun 05, 2013

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Small two-component Fermi gases in a cubic box with periodic boundary conditions (2013)

X. Y. Yin and D. Blume

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-06-11

Description: Author(s): X. Y. Yin and D. Blume The properties of two-component Fermi gases become universal if the interspecies s -wave scattering length a s and the average interparticle spacing are much larger than the range of the underlying two-body potential. Using an explicitly correlated Gaussian basis set expansion approach, we determine t... [Phys. Rev. A 87, 063609] Published Mon Jun 10, 2013

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Emergence of spatially extended pair coherence through incoherent local environmental coupling (2013)

Jean-Sébastien Bernier, Peter Barmettler, Dario Poletti, and Corinna Kollath

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-06-11

Description: Author(s): Jean-Sébastien Bernier, Peter Barmettler, Dario Poletti, and Corinna Kollath We demonstrate that quantum coherence can be generated by the interplay of coupling to an incoherent environment and kinetic processes. This joint effect even occurs in a repulsively interacting fermionic system initially prepared in an incoherent Mott insulating state. In this case, coupling a diss... [Phys. Rev. A 87, 063608] Published Mon Jun 10, 2013

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Phase diagram of quasi-two-dimensional bosons in a laser-speckle potential (2013)

G. E. Astrakharchik, K. V. Krutitsky, and P. Navez

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-06-11

Description: Author(s): G. E. Astrakharchik, K. V. Krutitsky, and P. Navez We have studied the phase diagram of a quasi-two-dimensional interacting Bose gas at zero temperature in the presence of random potential created by laser speckles. The superfluid fraction and the fraction of particles with zero momentum are obtained within the mean-field Gross-Pitaevskii theory and... [Phys. Rev. A 87, 061601] Published Mon Jun 10, 2013

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Phase diagram of a rapidly rotating two-component Bose gas (2013)

E. Ö. Karabulut, F. Malet, G. M. Kavoulakis, and S. M. Reimann

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-04-10

Description: Author(s): E. Ö. Karabulut, F. Malet, G. M. Kavoulakis, and S. M. Reimann We derive analytically the phase diagram of a two-component Bose gas confined in an anharmonic potential, which becomes exact and universal in the limit of weak interactions and small anharmonicity of the trapping potential. The transitions between the different phases, which consist of vortex state... [Phys. Rev. A 87, 043609] Published Tue Apr 09, 2013

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Spin mixing in spinor Fermi gases (2013)

Ying Dong and Han Pu

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-04-10

Description: Author(s): Ying Dong and Han Pu We study a spinor fermionic system under the effect of a spin-exchange interaction. We focus on the interplay between the spin-exchange interaction and the effective quadratic Zeeman shift. We examine the static and the dynamic properties of both a two- and many-body system. We find that the spin-ex... [Phys. Rev. A 87, 043610] Published Tue Apr 09, 2013

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

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Mean-field dynamics to negative absolute temperatures in the Bose-Hubbard model (2013)

Ákos Rapp

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-04-10

Description: Author(s): Ákos Rapp We apply time-dependent Gutzwiller mean-field theory to provide a qualitative understanding for bosons in optical lattices that approach states corresponding to negative absolute temperatures. We perform the dynamical simulations to relate to the recent experiments by Braun et al. [ S. Braun, J. P. ... [Phys. Rev. A 87, 043611] Published Tue Apr 09, 2013

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Collective modes of a two-dimensional spin-1/2 Fermi gas in a harmonic trap (2013)

Stefan K. Baur, Enrico Vogt, Michael Köhl, and Georg M. Bruun

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-04-10

Description: Author(s): Stefan K. Baur, Enrico Vogt, Michael Köhl, and Georg M. Bruun We derive analytical expressions for the frequency and damping of the lowest collective modes of a two-dimensional Fermi gas using kinetic theory. For strong coupling, we furthermore show that pairing correlations overcompensate the effects of Pauli blocking on the collision rate for a large range o... [Phys. Rev. A 87, 043612] Published Tue Apr 09, 2013

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

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Supersonic flow of a Bose-Einstein condensate past an oscillating attractive-repulsive obstacle (2013)

E. G. Khamis and A. Gammal

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-04-02

Description: Author(s): E. G. Khamis and A. Gammal We investigate by numerical simulations the pattern formation after an oscillating attractive-repulsive obstacle inserted into the flow of a Bose-Einstein condensate. For slow oscillations we observe a complex emission of vortex dipoles. For moderate oscillations organized lined up vortex dipoles ar... [Phys. Rev. A 87, 045601] Published Mon Apr 01, 2013

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

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Thermal spin fluctuations in spinor Bose-Einstein condensates (2013)

M. Melé-Messeguer, B. Juliá-Díaz, A. Polls, and L. Santos

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-03-30

Description: Author(s): M. Melé-Messeguer, B. Juliá-Díaz, A. Polls, and L. Santos We study the thermal activation of spin fluctuations in dynamically stable spinor Bose-Einstein condensates. We analyze the specific cases of a nondipolar spin-1 condensate in the state m =0, where thermal activation results from spin-changing collisions, and of a chromium condensate in the maximally... [Phys. Rev. A 87, 033632] Published Fri Mar 29, 2013

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

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Snake instability of ring dark solitons in toroidally trapped Bose-Einstein condensates (2013)

L. A. Toikka and K.-A. Suominen

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-04-04

Description: Author(s): L. A. Toikka and K.-A. Suominen We show by numerically solving the Bogoliubov–de Gennes equations and numerically integrating the Gross-Pitaevskii equation that the onset of the snake instability of ring dark solitons requires a broken symmetry. We elucidate explicitly the connection between imaginary Bogoliubov modes and the snak... [Phys. Rev. A 87, 043601] Published Wed Apr 03, 2013

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Quench dynamics and emergence of phase separation in two-component atomic Bose gases at zero temperature and above the Bose-Einstein-condensation critical temperature (2013)

Chih-Chun Chien and Fred Cooper

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-04-11

Description: Author(s): Chih-Chun Chien and Fred Cooper We study the dynamics of two-component atomic Bose gases initially in a mixture encountering a sudden quench of the interspecies interactions. The dynamics above the critical temperature T c is studied using a leading-order large- N approximation that predicted a phase transition from mixing to phase ... [Phys. Rev. A 87, 045602] Published Wed Apr 10, 2013

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Ab initio derivation of Hubbard models for cold atoms in optical lattices (2013)

R. Walters, G. Cotugno, T. H. Johnson, S. R. Clark, and D. Jaksch

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-04-11

Description: Author(s): R. Walters, G. Cotugno, T. H. Johnson, S. R. Clark, and D. Jaksch We derive ab initio local Hubbard models for several optical-lattice potentials of current interest, including the honeycomb and kagome lattices, verifying their accuracy on each occasion by comparing the interpolated band structures against the originals. To achieve this, we calculate the maximally... [Phys. Rev. A 87, 043613] Published Wed Apr 10, 2013

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Unconventional spin-density waves in dipolar Fermi gases (2013)

S. G. Bhongale, L. Mathey, Shan-Wen Tsai, Charles W. Clark, and Erhai Zhao

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-04-06

Description: Author(s): S. G. Bhongale, L. Mathey, Shan-Wen Tsai, Charles W. Clark, and Erhai Zhao We show that unconventional spin order arises naturally in two-component dipolar Fermi gases of atoms or molecules, which recently became accessible experimentally, in optical lattices. Using an unbiased functional renormalization-group analysis, we find that dipolar interactions lead to an instabil... [Phys. Rev. A 87, 043604] Published Fri Apr 05, 2013

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Quantum-limited measurement of magnetic-field gradient with entangled atoms (2013)

H. T. Ng

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-04-05

Description: Author(s): H. T. Ng We propose a method to detect the amplitude gradient of a microwave field by using a pair of entangled two-component Bose-Einstein condensates. We consider the two spatially separated condensates to be coupled to the two different magnetic fields. The magnetic-field gradient can be determined by mea... [Phys. Rev. A 87, 043602] Published Thu Apr 04, 2013

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Thomas–Fermi–von Weizsäcker theory for a harmonically trapped, two-dimensional, spin-polarized dipolar Fermi gas (2013)

B. P. van Zyl, E. Zaremba, and P. Pisarski

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-04-11

Description: Author(s): B. P. van Zyl, E. Zaremba, and P. Pisarski We systematically develop a density functional description for the equilibrium properties of a two-dimensional, harmonically trapped, spin-polarized dipolar Fermi gas based on the Thomas–Fermi–von Weizsäcker approximation. We pay particular attention to the construction of the two-dimensional kineti... [Phys. Rev. A 87, 043614] Published Wed Apr 10, 2013

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Superfluidity of a spin-imbalanced Fermi gas in a three-dimensional optical lattice (2013)

R. Mendoza, Mauricio Fortes, M. A. Solís, and Zlatko Koinov

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-07

Description: Author(s): R. Mendoza, Mauricio Fortes, M. A. Solís, and Zlatko Koinov We study fermion pairing in a population-imbalanced mixture of 6 Li atomic gas loaded in a three-dimensional lattice at very low temperatures. Using the number equation for each population, the gap equation, and the equation for the Helmholtz free energy, we determine the gap, chemical potentials, an... [Phys. Rev. A 88, 033606] Published Fri Sep 06, 2013

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Few interacting fermions in a one-dimensional harmonic trap (2013)

Tomasz Sowiński, Tobias Grass, Omjyoti Dutta, and Maciej Lewenstein

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-07

Description: Author(s): Tomasz Sowiński, Tobias Grass, Omjyoti Dutta, and Maciej Lewenstein We study spin-1/2 fermions, interacting via a two-body contact potential, in a one-dimensional harmonic trap. Applying exact diagonalization, we investigate their behavior at finite interaction strength and discuss the role of the ground-state degeneracy which occurs for sufficiently strong repulsiv... [Phys. Rev. A 88, 033607] Published Fri Sep 06, 2013

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Optimal quantum control of Bose-Einstein condensates in magnetic microtraps: Consideration of filter effects (2013)

Georg Jäger and Ulrich Hohenester

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-10

Description: Author(s): Georg Jäger and Ulrich Hohenester We theoretically investigate protocols based on optimal control theory (OCT) for manipulating Bose-Einstein condensates in magnetic microtraps, using the framework of the Gross-Pitaevskii equation. In our approach we explicitly account for filter functions that distort the computed optimal control, ... [Phys. Rev. A 88, 035601] Published Mon Sep 09, 2013

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Flow-enhanced pairing and other unusual effects in Fermi gases in synthetic gauge fields (2013)

Vijay B. Shenoy

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-10

Description: Author(s): Vijay B. Shenoy Recent experiments on fermions in synthetic gauge fields result in systems with a spin-orbit coupling along one spatial axis, a detuning field, and a Zeeman field. We show theoretically that the presence of all three results in interesting and unusual phenomena in a system of interacting fermions (i... [Phys. Rev. A 88, 033609] Published Mon Sep 09, 2013

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Self-bound many-body states of quasi-one-dimensional dipolar Fermi gases: Exploiting Bose-Fermi mappings for generalized contact interactions (2013)

F. Deuretzbacher, G. M. Bruun, C. J. Pethick, M. Jona-Lasinio, S. M. Reimann, and L. Santos

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-11

Description: Author(s): F. Deuretzbacher, G. M. Bruun, C. J. Pethick, M. Jona-Lasinio, S. M. Reimann, and L. Santos Using a combination of results from exact mappings and from mean-field theory we explore the phase diagram of quasi-one-dimensional systems of identical fermions with attractive dipolar interactions. We demonstrate that at low density these systems provide a realization of a single-component one-dim... [Phys. Rev. A 88, 033611] Published Tue Sep 10, 2013

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Spin dynamics in a spin-orbit-coupled Fermi gas (2013)

Stefan S. Natu and S. Das Sarma

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-12

Description: Author(s): Stefan S. Natu and S. Das Sarma We study the dynamics of a nondegenerate, harmonically trapped Fermi gas following a sudden ramp of the spin-orbit coupling strength using a Boltzmann equation approach. In the absence of interactions and a Zeeman field, we solve the spin-orbit-coupled Boltzmann equation analytically and derive expr... [Phys. Rev. A 88, 033613] Published Wed Sep 11, 2013

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Formation and decay of Bose-Einstein condensates in an excited band of a double-well optical lattice (2013)

Saurabh Paul and Eite Tiesinga

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-13

Description: Author(s): Saurabh Paul and Eite Tiesinga We study the formation and collision-aided decay of an ultracold atomic Bose-Einstein condensate in the first excited band of a double-well two-dimensional optical lattice with weak harmonic confinement in the perpendicular z direction. This lattice geometry is based on an experiment by Wirth et al. ... [Phys. Rev. A 88, 033615] Published Thu Sep 12, 2013

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Simple and efficient all-optical production of spinor condensates (2013)

J. Jiang, L. Zhao, M. Webb, N. Jiang, H. Yang, and Y. Liu

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-18

Description: Author(s): J. Jiang, L. Zhao, M. Webb, N. Jiang, H. Yang, and Y. Liu We present a simple and optimal experimental scheme for an all-optical production of a sodium spinor Bose-Einstein condensate (BEC). With this scheme, we demonstrate that the number of atoms in a pure BEC can be greatly boosted by a factor of 5 over some widely used schemes in a simple single-beam o... [Phys. Rev. A 88, 033620] Published Tue Sep 17, 2013

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Breakdown of the Kohn theorem near a Feshbach resonance in a magnetic trap (2013)

Hamid Al-Jibbouri and Axel Pelster

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-18

Description: Author(s): Hamid Al-Jibbouri and Axel Pelster We study the collective excitation frequencies of a harmonically trapped 85 Rb Bose-Einstein condensate (BEC) in the vicinity of a Feshbach resonance. To this end, we solve the underlying Gross-Pitaevskii (GP) equation by using a Gaussian variational approach and obtain the coupled set of ordinary di... [Phys. Rev. A 88, 033621] Published Tue Sep 17, 2013

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Solitary matter waves in combined linear and nonlinear potentials: Detection, stability, and dynamics (2013)

Scott Holmes, Mason A. Porter, Peter Krüger, and Panayotis G. Kevrekidis

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-25

Description: Author(s): Scott Holmes, Mason A. Porter, Peter Krüger, and Panayotis G. Kevrekidis We study statically homogeneous Bose-Einstein condensates with spatially inhomogeneous interactions and outline an experimental realization of compensating linear and nonlinear potentials that can yield constant-density solutions. We illustrate how the presence of a step in the nonlinearity coeffici... [Phys. Rev. A 88, 033627] Published Tue Sep 24, 2013

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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

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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

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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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Exploring multiband excitations of interacting Bose gases in a one-dimensional optical lattice by coherent scattering (2011)

Xinxing Liu, Xiaoji Zhou, Wei Zhang, Thibault Vogt, Bo Lu, Xuguang Yue, and Xuzong Chen

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2011-06-07

Description: Author(s): Xinxing Liu, Xiaoji Zhou, Wei Zhang, Thibault Vogt, Bo Lu, Xuguang Yue, and Xuzong Chen We use a coherent Bragg diffraction method to impart an external momentum to ultracold bosonic atoms trapped in a one-dimensional optical lattice. This method is based on the application of a single light pulse, with conditions where scattering of photons can be resonantly amplified by atomic densit... [Phys. Rev. A 83, 063604] Published Mon Jun 06, 2011

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Quantum quench dynamics of the Bose-Hubbard model at finite temperatures (2011)

J. M. Zhang, C. Shen, and W. M. Liu

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2011-06-18

Description: Author(s): J. M. Zhang, C. Shen, and W. M. Liu We study quench dynamics of the Bose-Hubbard model by exact diagonalization. Initially, the system is at thermal equilibrium and of a finite temperature. The system is then quenched by changing the on-site interaction strength U suddenly. Both the single-quench and double-quench scenarios are consid... [Phys. Rev. A 83, 063622] Published Fri Jun 17, 2011

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Effective action approach to the p-band Mott insulator and superfluid transition (2011)

Xiaopeng Li, Erhai Zhao, and W. Vincent Liu

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2011-06-21

Description: Author(s): Xiaopeng Li, Erhai Zhao, and W. Vincent Liu Motivated by the recent experiment on p -orbital-band bosons in optical lattices, we study theoretically the quantum phases of Mott insulator and superfluidity in two dimensions. The system features a superfluid phase with transversely staggered orbital current at weak interaction and a Mott insulato... [Phys. Rev. A 83, 063626] Published Mon Jun 20, 2011

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Deterministic spin-wave interferometer based on the Rydberg blockade (2011)

Ran Wei, Bo Zhao, Youjin Deng, Yu-Ao Chen, and Jian-Wei Pan

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2011-06-21

Description: Author(s): Ran Wei, Bo Zhao, Youjin Deng, Yu-Ao Chen, and Jian-Wei Pan The spin-wave (SW) N -particle path-entangled | N ,0〉+|0, N 〉 (NOON) state is an N -particle Fock state with two atomic spin-wave modes maximally entangled. Attributed to the property that the phase is sensitive to collective atomic motion, the SW NOON state can be utilized as an atomic interferometer and... [Phys. Rev. A 83, 063623] Published Mon Jun 20, 2011

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Single impurity in ultracold Fermi superfluids (2011)

Lei Jiang, Leslie O. Baksmaty, Hui Hu, Yan Chen, and Han Pu

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2011-06-23

Description: Author(s): Lei Jiang, Leslie O. Baksmaty, Hui Hu, Yan Chen, and Han Pu The role of impurities as experimental probes in the detection of quantum material properties is well appreciated. Here we study the effect of a single classical magnetic impurity in trapped ultracold Fermi superfluids. Depending on its shape and strength, a magnetic impurity can induce single or mu... [Phys. Rev. A 83, 061604] Published Wed Jun 22, 2011

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Singlet and triplet superfluid competition in a mixture of two-component Fermi and one-component dipolar Bose gases (2011)

Ben Kain and Hong Y. Ling

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2011-06-23

Description: Author(s): Ben Kain and Hong Y. Ling We consider a mixture of two-component Fermi and (one-component) dipolar Bose gases in which both dipolar interaction and s -wave scattering between fermions of opposite spins are tunable. We show that in the long-wavelength limit, the anisotropy in the Fermi-Fermi interaction induced by phonons of t... [Phys. Rev. A 83, 061603] Published Wed Jun 22, 2011

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Slow-light probe of Fermi pairing through an atom-molecule dark state (2011)

H. Jing, Y. Deng, and P. Meystre

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2011-06-08

Description: Author(s): H. Jing, Y. Deng, and P. Meystre We consider the two-color photoassociation of a quantum degenerate atomic gas into ground-state diatomic molecules via a molecular dark state. This process can be described in terms of a Λ level scheme that is formally analogous to the situation in electromagnetically induced transparency in atomic ... [Phys. Rev. A 83, 063605] Published Tue Jun 07, 2011

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Band-structure loops and multistability in cavity QED (2011)

B. Prasanna Venkatesh, J. Larson, and D. H. J. O’Dell

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2011-06-08

Description: Author(s): B. Prasanna Venkatesh, J. Larson, and D. H. J. O’Dell We calculate the band structure of ultracold atoms located inside a laser-driven optical cavity. For parameters where the atom-cavity system exhibits bistability, the atomic band structure develops loop structures akin to the ones predicted for Bose-Einstein condensates in ordinary (noncavity) optic... [Phys. Rev. A 83, 063606] Published Tue Jun 07, 2011

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Beyond mean-field dynamics in open Bose-Hubbard chains (2011)

D. Witthaut, F. Trimborn, H. Hennig, G. Kordas, T. Geisel, and S. Wimberger

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2011-06-08

Description: Author(s): D. Witthaut, F. Trimborn, H. Hennig, G. Kordas, T. Geisel, and S. Wimberger We investigate the effects of phase noise and particle loss on the dynamics of a Bose-Einstein condensate in an optical lattice. Starting from the many-body master equation, we discuss the applicability of generalized mean-field approximations in the presence of dissipation as well as methods to sim... [Phys. Rev. A 83, 063608] Published Tue Jun 07, 2011

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Theory of a fermionic superfluid with SU(2) × SU(6) symmetry (2011)

S.-K. Yip

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2011-06-08

Description: Author(s): S.-K. Yip We study theoretically interspecies Cooper pairing in a fermionic system with SU(2) × SU(6) symmetry. We show that, with suitable unitary transformations, the order parameter for the ground state can be reduced to only two nonvanishing complex components. The ground state has a large degeneracy. We ... [Phys. Rev. A 83, 063607] Published Tue Jun 07, 2011

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Formation of magnetic impurities and pair-breaking effect in a superfluid Fermi gas (2011)

Y. Ohashi

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2011-06-11

Description: Author(s): Y. Ohashi We theoretically investigate the introduction of magnetic impurities into a superfluid Fermi gas. In the presence of a population imbalance ( N ↑ 〉 N ↓ , where N σ is the number of Fermi atoms with pseudospin σ =↑,↓ ), we show that nonmagnetic potential scatterers embedded in the system are magnetized in ... [Phys. Rev. A 83, 063611] Published Fri Jun 10, 2011

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Measurement backaction on the quantum spin-mixing dynamics of a spin-1 Bose-Einstein condensate (2011)

Keye Zhang, Lu Zhou, Hong Y. Ling, Han Pu, and Weiping Zhang

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2011-06-21

Description: Author(s): Keye Zhang, Lu Zhou, Hong Y. Ling, Han Pu, and Weiping Zhang We consider a small F =1 spinor condensate inside an optical cavity driven by an optical probe field, and subject the output of the probe to a homodyne detection, with the goal of investigating the effect of measurement backaction on the spin dynamics of the condensate. Using the stochastic master eq... [Phys. Rev. A 83, 063624] Published Mon Jun 20, 2011

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Bogoliubov dynamics of condensate collisions using the positive-P representation (2011)

P. Deuar, J. Chwedeńczuk, M. Trippenbach, and P. Ziń

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2011-06-21

Description: Author(s): P. Deuar, J. Chwedeńczuk, M. Trippenbach, and P. Ziń We formulate the time-dependent Bogoliubov dynamics of colliding Bose-Einstein condensates in terms of a positive- P representation of the Bogoliubov field. We obtain stochastic evolution equations for the field which converge to the full Bogoliubov description as the number of realizations grows. Th... [Phys. Rev. A 83, 063625] Published Mon Jun 20, 2011

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Robust sub-shot-noise measurement via Rabi-Josephson oscillations in bimodal Bose-Einstein condensates (2011)

I. Tikhonenkov, M. G. Moore, and A. Vardi

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2011-06-24

Description: Author(s): I. Tikhonenkov, M. G. Moore, and A. Vardi Mach-Zehnder atom interferometry requires hold-time phase squeezing to attain readout accuracy below the standard quantum limit. This increases its sensitivity to phase diffusion, restoring shot-noise scaling of the optimal signal-to-noise ratio in the presence of interactions. The contradiction bet... [Phys. Rev. A 83, 063628] Published Thu Jun 23, 2011

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Bogoliubov excitations of disordered Bose-Einstein condensates (2011)

Christopher Gaul and Cord A. Müller

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2011-06-24

Description: Author(s): Christopher Gaul and Cord A. Müller We describe repulsively interacting Bose-Einstein condensates in spatially correlated disorder potentials of arbitrary dimension. The first effect of disorder is to deform the mean-field condensate. The second is that the quantum excitation spectrum and condensate population are affected. By a saddl... [Phys. Rev. A 83, 063629] Published Thu Jun 23, 2011

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Quantum Hall effects in fast-rotating Fermi gases with anisotropic dipolar interaction (2011)

R.-Z. Qiu, Su-Peng Kou, Z.-X. Hu, Xin Wan, and S. Yi

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2011-06-29

Description: Author(s): R.-Z. Qiu, Su-Peng Kou, Z.-X. Hu, Xin Wan, and S. Yi We investigate fast rotating quasi-two-dimensional dipolar Fermi gases in the quantum Hall regime. By tuning the direction of the dipole moments with respect to the z axis, the dipole-dipole interaction becomes anisotropic in the x - y plane. For a soft confining potential we find that, as we tilt the... [Phys. Rev. A 83, 063633] Published Tue Jun 28, 2011

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Finite-temperature stability of a trapped dipolar Bose gas (2011)

R. N. Bisset, D. Baillie, and P. B. Blakie

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2011-06-14

Description: Author(s): R. N. Bisset, D. Baillie, and P. B. Blakie We calculate the stability diagram for a trapped normal Bose gas with dipole-dipole interactions. Our study characterizes the roles of trap geometry, temperature, and short-range interactions on the stability. We predict a robust double instability feature in oblate trapping geometries arising from ... [Phys. Rev. A 83, 061602] Published Mon Jun 13, 2011

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Single-particle momentum distribution of an Efimov trimer (2011)

Yvan Castin and Félix Werner

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2011-06-14

Description: Author(s): Yvan Castin and Félix Werner Experimental progress in the study of strongly interacting ultracold atoms has recently allowed the observation of Efimov trimers. We study theoretically a nonconventional observable for these trimer states, which may be accessed experimentally, the momentum distribution n ( k ) of the constitutive bos... [Phys. Rev. A 83, 063614] Published Mon Jun 13, 2011

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Semiclassical analysis of the Efimov energy spectrum in the unitary limit (2011)

Rajat K. Bhaduri, Matthias Brack, and M. V. N. Murthy

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2011-06-14

Description: Author(s): Rajat K. Bhaduri, Matthias Brack, and M. V. N. Murthy We demonstrate that the ( s -wave) geometric spectrum of the Efimov energy levels in the unitary limit is generated by the radial motion of a primitive periodic orbit (and its harmonics) of the corresponding classical system. The action of the primitive orbit depends logarithmically on the energy. It ... [Phys. Rev. A 83, 063612] Published Mon Jun 13, 2011

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Utility of atomic kicked-rotor interferometers for precision measurements (2011)

R. A. Horne, R. H. Leonard, and C. A. Sackett

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2011-06-14

Description: Author(s): R. A. Horne, R. H. Leonard, and C. A. Sackett We theoretically investigate a proposed scheme to use an atomic δ -kicked rotor resonance for high-precision measurements of accelerations and the photon recoil frequency. Although the technique offers rapid scaling of the measurement sensitivity with pulse number, it also features a high sensitivity... [Phys. Rev. A 83, 063613] Published Mon Jun 13, 2011

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Attractive Bose-Einstein condensates in three dimensions under rotation: Revisiting the problem of stability of the ground state in harmonic traps (2011)

Marios C. Tsatsos

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2011-06-15

Description: Author(s): Marios C. Tsatsos We study harmonically trapped ultracold Bose gases with attractive interparticle interactions under external rotation in three spatial dimensions and determine the critical value of the attraction strength where the gas collapses as a function of the rotation frequency. To this end, we examine the s... [Phys. Rev. A 83, 063615] Published Tue Jun 14, 2011

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High-temperature thermodynamics of strongly interacting s-wave and p-wave Fermi gases in a harmonic trap (2011)

Shi-Guo Peng, Shi-Qun Li, Peter D. Drummond, and Xia-Ji Liu

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2011-06-16

Description: Author(s): Shi-Guo Peng, Shi-Qun Li, Peter D. Drummond, and Xia-Ji Liu We theoretically investigate the high-temperature thermodynamics of a strongly interacting trapped Fermi gas near either s -wave or p -wave Feshbach resonances, using a second-order quantum virial expansion. The second virial coefficient is calculated based on the energy spectrum of two interacting fe... [Phys. Rev. A 83, 063618] Published Wed Jun 15, 2011

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Precision benchmark calculations for four particles at unitarity (2011)

Shahin Bour, Xin Li, Dean Lee, Ulf-G. Meißner, and Lubos Mitas

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2011-06-16

Description: Author(s): Shahin Bour, Xin Li, Dean Lee, Ulf-G. Meißner, and Lubos Mitas The unitarity limit describes interacting particles where the range of the interaction is zero and the scattering length is infinite. We present precision benchmark calculations for two-component fermions at unitarity using three different ab initio methods: Hamiltonian lattice formalism using itera... [Phys. Rev. A 83, 063619] Published Wed Jun 15, 2011

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Excitation spectra and rf response near the polaron-to-molecule transition from the functional renormalization group (2011)

Richard Schmidt and Tilman Enss

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2011-06-16

Description: Author(s): Richard Schmidt and Tilman Enss A light impurity in a Fermi sea undergoes a transition from a polaron to a molecule for increasing interaction. We develop a method to compute the spectral functions of the polaron and molecule in a unified framework based on the functional renormalization group with full self-energy feedback. We di... [Phys. Rev. A 83, 063620] Published Wed Jun 15, 2011

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

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Momentum distribution and ordering in mixtures of ultracold light- and heavy-fermion atoms (2011)

M. M. Maśka, R. Lemański, C. J. Williams, and J. K. Freericks

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2011-06-29

Description: Author(s): M. M. Maśka, R. Lemański, C. J. Williams, and J. K. Freericks The momentum distribution is one of the most important quantities which provides information about interactions in many-body systems. At the same time it is a quantity that can easily be accessed in experiments on ultracold atoms. In this paper, we consider mixtures of light- and heavy-fermionic ato... [Phys. Rev. A 83, 063631] Published Tue Jun 28, 2011

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

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Compressibility and entropy of cold fermions in one-dimensional optical lattices (2011)

Andrew Snyder, Iori Tanabe, and Theja De Silva

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2011-06-29

Description: Author(s): Andrew Snyder, Iori Tanabe, and Theja De Silva We calculate several thermodynamic quantities for repulsively interacting one-dimensional fermions. We solve the Hubbard model at both zero and finite temperatures using the Bethe-ansatz method. For arbitrary values of the chemical potential, we calculate the particle number density, the double occu... [Phys. Rev. A 83, 063632] Published Tue Jun 28, 2011

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

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Collapse and revival dynamics of number-squeezed superfluids of ultracold atoms in optical lattices (2011)

E. Tiesinga and P. R. Johnson

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2011-06-11

Description: Author(s): E. Tiesinga and P. R. Johnson Recent experiments have shown a remarkable number of collapse and revival oscillations of the matter-wave coherence of ultracold atoms in optical lattices [ Will et al. , Nature (London) 465 , 197 (2010) ]. Using a mean-field approximation to the Bose-Hubbard model, we show that the visibility of collap... [Phys. Rev. A 83, 063609] Published Fri Jun 10, 2011

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

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Comparison between theory and experiment for universal thermodynamics of a homogeneous, strongly correlated Fermi gas (2011)

Hui Hu, Xia-Ji Liu, and Peter D. Drummond

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2011-06-11

Description: Author(s): Hui Hu, Xia-Ji Liu, and Peter D. Drummond We compare the theoretical predictions for universal thermodynamics of a homogeneous, strongly correlated Fermi gas with the latest experimental measurements reported by the ENS group [ S. Nascimbène et al. , Nature (London) 463 , 1057 (2010) ] and the Tokyo group [ M. Horikoshi et al. , Science 327 , 442 ... [Phys. Rev. A 83, 063610] Published Fri Jun 10, 2011

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

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Tunable dipolar resonances and Einstein-de Haas effect in a ^{87}Rb-atom condensate (2011)

Tomasz Świsłocki, Tomasz Sowiński, Joanna Pietraszewicz, Mirosław Brewczyk, Maciej Lewenstein, Jakub Zakrzewski, and Mariusz Gajda

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2011-06-15

Description: Author(s): Tomasz Świsłocki, Tomasz Sowiński, Joanna Pietraszewicz, Mirosław Brewczyk, Maciej Lewenstein, Jakub Zakrzewski, and Mariusz Gajda We theoretically study a spinor condensate of 87 Rb atoms in a F =1 hyperfine state confined in an optical dipole trap. Putting initially all atoms in an m F =1 , component we observe a significant transfer of atoms to other, initially empty Zeeman states exclusively due to dipolar forces. Because of con... [Phys. Rev. A 83, 063617] Published Tue Jun 14, 2011

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

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Correlation in a coherent electron beam (2011)

Tetsuji Kodama, Nobuyuki Osakabe, and Akira Tonomura

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2011-06-15

Description: Author(s): Tetsuji Kodama, Nobuyuki Osakabe, and Akira Tonomura Correlations between successive detections in beams of free electrons are studied with a transmission electron microscope. For incoherent illumination of the detectors, a certain random coincidence probability is observed, indicative for uncorrelated arrival times of the electrons. When the illumina... [Phys. Rev. A 83, 063616] Published Tue Jun 14, 2011

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

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Stable Fulde-Ferrell-Larkin-Ovchinnikov pairing states in two-dimensional and three-dimensional optical lattices (2011)

Zi Cai, Yupeng Wang, and Congjun Wu

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2011-06-17

Description: Author(s): Zi Cai, Yupeng Wang, and Congjun Wu We present the study of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) pairing states in the p -orbital bands in both two- and three-dimensional optical lattices. Due to the quasi-one-dimensional band structure which arises from the unidirectional hopping of the orthogonal p orbitals, the pairing phase ... [Phys. Rev. A 83, 063621] Published Thu Jun 16, 2011

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

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Dissipative dynamics of the Josephson effect in binary Bose-Einstein-condensed mixtures (2011)

S. N. Burmistrov

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2011-06-22

Description: Author(s): S. N. Burmistrov The dissipative dynamics of a pointlike Josephson junction in binary Bose-Einstein-condensed mixtures is analyzed within the framework of the model of a tunneling Hamiltonian. The transmission of unlike particles across a junction is described by the different transmission amplitudes. The effective ... [Phys. Rev. A 83, 063627] Published Tue Jun 21, 2011

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

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Multiband and nonlinear hopping corrections to the three-dimensional Bose-Fermi-Hubbard model (2011)

Alexander Mering and Michael Fleischhauer

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2011-06-28

Description: Author(s): Alexander Mering and Michael Fleischhauer Recent experiments revealed the importance of higher-band effects for the Mott-insulator(MI)–superfluid transition(SF) of ultracold bosonic atoms or mixtures of bosons and fermions in deep optical lattices [ Best et al. , Phys. Rev. Lett. 102 , 030408 (2009) ; Will et al. , Nature (London) 465 , 197 (2010... [Phys. Rev. A 83, 063630] Published Mon Jun 27, 2011

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

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Skyrmion-antiskyrmion pairs in ultracold atomic gases (2011)

H. M. Price and N. R. Cooper

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2011-06-28

Description: Author(s): H. M. Price and N. R. Cooper We study theoretically the dynamics of two-component Bose-Einstein condensates in two dimensions, which admit topological excitations related to the skyrmions of nuclear physics. We investigate a branch of uniformly propagating solitary waves, which, at high momentum, can be viewed as skyrmion-antis... [Phys. Rev. A 83, 061605] Published Mon Jun 27, 2011

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

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Polaron-molecule transitions in a two-dimensional Fermi gas (2011)

Meera M. Parish

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2011-05-12

Description: Author(s): Meera M. Parish We address the problem of a single “spin-down” impurity atom interacting attractively with a spin-up Fermi gas in two dimensions (2D). We consider the case where the mass of the impurity is greater than or equal to the mass of a spin-up fermion. Using a variational approach, we resolve the quest... [Phys. Rev. A 83, 051603] Published Wed May 11, 2011

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

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Structural change of vortex patterns in anisotropic Bose-Einstein condensates (2011)

N. Lo Gullo, Th. Busch, and M. Paternostro

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2011-05-11

Description: Author(s): N. Lo Gullo, Th. Busch, and M. Paternostro We study the changes in the spatial distribution of vortices in a rotating Bose-Einstein condensate due to an increasing eccentricity of the trapping potential. By breaking the rotational symmetry, the vortex system undergoes a rich variety of structural changes, including the formation of zigzag an... [Phys. Rev. A 83, 053612] Published Tue May 10, 2011

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

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Symmetry analysis of crystalline spin textures in dipolar spinor condensates (2011)

R. W. Cherng and E. Demler

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2011-05-11

Description: Author(s): R. W. Cherng and E. Demler We study periodic crystalline spin textures in spinor condensates with dipolar interactions via a systematic symmetry analysis of the low-energy effective theory. By considering symmetry operations which combine real- and spin-space operations, we classify symmetry groups consistent with nontrivial ... [Phys. Rev. A 83, 053613] Published Tue May 10, 2011

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

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Coherent adiabatic transport of atoms in radio-frequency traps (2011)

T. Morgan, B. O’Sullivan, and Th. Busch

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2011-05-21

Description: Author(s): T. Morgan, B. O’Sullivan, and Th. Busch Coherent transport by adiabatic passage has recently been suggested as a high-fidelity technique to engineer the center-of-mass state of single atoms in inhomogeneous environments. While the basic theory behind this process is well understood, several conceptual challenges for its experimental obser... [Phys. Rev. A 83, 053620] Published Thu May 19, 2011

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

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