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Ferromagnetic-nematic order and strongly correlated phases of fermions in optical flux lattices (2015)

Simon C. Davenport and Nigel R. Cooper

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Simon C. Davenport and Nigel R. Cooper We study a model of a two-dimensional ultracold atomic gas subjected to an “optical flux lattice”: a laser configuration where Raman-dressed atoms experience a strong artificial magnetic field. This leads to a band structure of narrow energy bands with nonzero Chern numbers. We consider the case of … [Phys. Rev. A 92, 023608] Published Mon Aug 10, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Thema: Physik

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Enhanced stripe phases in spin-orbit-coupled Bose-Einstein condensates in ring cavities (2015)

Farokh Mivehvar and David L. Feder

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Farokh Mivehvar and David L. Feder The coupled dynamics of the atom and photon fields in optical ring cavities with two counterpropagating modes give rise to both spin-orbit interactions as well as long-ranged interactions between atoms of a many-body system. At zero temperature, the interplay between the two-body and cavity-mediated… [Phys. Rev. A 92, 023611] Published Mon Aug 10, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Triplet pair amplitude in a trapped s-wave superfluid Fermi gas with broken spin rotation symmetry (2015)

Yuki Endo, Daisuke Inotani, Ryo Hanai, and Yoji Ohashi

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Yuki Endo, Daisuke Inotani, Ryo Hanai, and Yoji Ohashi We investigate the possibility that the broken spatial inversion symmetry caused by a trap potential induces a spin-triplet Cooper pair amplitude in an s -wave superfluid Fermi gas. Based on symmetry considerations, we clarify that this phenomenon may occur, when a spin rotation symmetry of the syste… [Phys. Rev. A 92, 023610] Published Mon Aug 10, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Momentum-space Harper-Hofstadter model (2015)

Tomoki Ozawa, Hannah M. Price, and Iacopo Carusotto

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Tomoki Ozawa, Hannah M. Price, and Iacopo Carusotto We show how the weakly trapped Harper-Hofstadter model can be mapped onto a Harper-Hofstadter model in momentum space. In this momentum-space model, the band dispersion plays the role of the periodic potential, the Berry curvature plays the role of an effective magnetic field, the real-space harmoni… [Phys. Rev. A 92, 023609] Published Mon Aug 10, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Three-component Fulde-Ferrell superfluids in a two-dimensional Fermi gas with spin-orbit coupling (2015)

Fang Qin (覃昉), Fan Wu, Wei Zhang, Wei Yi, and Guang-Can Guo

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): Fang Qin (覃昉), Fan Wu, Wei Zhang, Wei Yi, and Guang-Can Guo We investigate the pairing physics of a three-component spin-orbit coupled Fermi gas in two spatial dimensions. The three atomic hyperfine states of the system are coupled by the recently realized synthetic spin-orbit coupling (SOC), which mixes different hyperfine states into helicity branches in a… [Phys. Rev. A 92, 023604] Published Tue Aug 04, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Reentrant behavior of the breathing-mode-oscillation frequency in a one-dimensional Bose gas (2015)

A. Iu. Gudyma, G. E. Astrakharchik, and Mikhail B. Zvonarev

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): A. Iu. Gudyma, G. E. Astrakharchik, and Mikhail B. Zvonarev Exciting temporal oscillations of the density distribution is a high-precision method for probing ultracold trapped atomic gases. Interaction effects in their many-body dynamics are particularly puzzling and counter-intuitive in one spatial dimension (1D) due to enhanced quantum correlations. We con… [Phys. Rev. A 92, 021601(R)] Published Fri Aug 07, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Quantum Hall effect with small numbers of vortices in Bose-Einstein condensates (2015)

Tim Byrnes and Jonathan P. Dowling

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-21

Beschreibung: Author(s): Tim Byrnes and Jonathan P. Dowling When vortices are displaced in Bose-Einstein condensates (BECs), the Magnus force gives the system a momentum transverse in the direction to the displacement. We show that BECs in long channels with vortices exhibit a quantization of the current response with respect to the spatial vortex distributi… [Phys. Rev. A 92, 023629] Published Thu Aug 20, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Bose-Bose mixtures with synthetic spin-orbit coupling in optical lattices (2015)

Liang He, Anchun Ji, and Walter Hofstetter

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-25

Beschreibung: Author(s): Liang He, Anchun Ji, and Walter Hofstetter We investigate the ground-state properties of Bose-Bose mixtures with Rashba-type spin-orbit (SO) coupling in a square lattice. The system displays rich physics from the deep Mott insulator (MI) all the way to the superfluid (SF) regime. In the deep MI regime, exotic spin-ordered phases arise due to… [Phys. Rev. A 92, 023630] Published Mon Aug 24, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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9

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Characterization of a simultaneous dual-species atom interferometer for a quantum test of the weak equivalence principle (2015)

A. Bonnin, N. Zahzam, Y. Bidel, and A. Bresson

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-19

Beschreibung: Author(s): A. Bonnin, N. Zahzam, Y. Bidel, and A. Bresson We present here the performance of a simultaneous dual-species matter-wave accelerometer for measuring the differential acceleration between two different atomic species ( Rb 87 and Rb 85 ). We study the expression and the extraction of the differential phase from the interferometer output. The differen… [Phys. Rev. A 92, 023626] Published Tue Aug 18, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Interacting multiple zero mode formulation and its application to a system consisting of a dark soliton in a condensate (2015)

J. Takahashi, Y. Nakamura, and Y. Yamanaka

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-19

Beschreibung: Author(s): J. Takahashi, Y. Nakamura, and Y. Yamanaka To formulate the zero modes in a finite-size system with spontaneous breakdown of symmetries in quantum field theory is not trivial, for in the naive Bogoliubov theory, one encounters difficulties such as phase diffusion, the absence of a definite criterion for determining the ground state, and infr… [Phys. Rev. A 92, 023627] Published Tue Aug 18, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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11

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Bayesian inference to characterize Josephson oscillations in a double-well trap (2015)

Juha Javanainen and Renuka Rajapakse

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-12

Beschreibung: Author(s): Juha Javanainen and Renuka Rajapakse We use quantum trajectories to simulate Josephson oscillations of atomic condensates between the two sides of a double-well potential. In the simulations the atoms in both wells are monitored using off-resonant light scattering, and the ultimate outcome of our thought experiment is a sequence of pho… [Phys. Rev. A 92, 023613] Published Tue Aug 11, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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12

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Disordered cold atoms in different symmetry classes (2015)

Fernanda Pinheiro and Jonas Larson

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-12

Beschreibung: Author(s): Fernanda Pinheiro and Jonas Larson We consider an experimentally realizable model of noninteracting but randomly coupled atoms in a two-dimensional optical lattice. By choosing appropriate real or complex-valued random fields and species-dependent energy offsets, this system can be used to analyze effects of disorder in four differen… [Phys. Rev. A 92, 023612] Published Tue Aug 11, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Cluster Gutzwiller study of the Bose-Hubbard ladder: Ground-state phase diagram and many-body Landau-Zener dynamics (2015)

Haiming Deng (邓海明), Hui Dai (代慧), Jiahao Huang (黄嘉豪), Xizhou Qin (秦锡洲), Jun Xu (徐军), Honghua Zhong (钟宏华), Chunshan He (何春山), and Chaohong Lee (李朝红)

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-15

Beschreibung: Author(s): Haiming Deng (邓海明), Hui Dai (代慧), Jiahao Huang (黄嘉豪), Xizhou Qin (秦锡洲), Jun Xu (徐军), Honghua Zhong (钟宏华), Chunshan He (何春山), and Chaohong Lee (李朝红) We present a cluster Gutzwiller mean-field study for ground states and time-evolution dynamics in the Bose-Hubbard ladder (BHL), which can be realized by loading Bose atoms in double-well optical lattices. In our cluster mean-field approach, we treat each double-well unit of two lattice sites as a c… [Phys. Rev. A 92, 023618] Published Thu Aug 13, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Molecular rotations in matter-wave interferometry (2015)

Benjamin A. Stickler and Klaus Hornberger

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-15

Beschreibung: Author(s): Benjamin A. Stickler and Klaus Hornberger We extend the theory of matter-wave interferometry of pointlike particles to nonspherical objects by taking the orientational degrees of freedom into account. In particular, we derive the grating transformation operator, which maps the impinging state onto the outgoing state, for a general, orientat… [Phys. Rev. A 92, 023619] Published Thu Aug 13, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Twist-and-turn spin squeezing in Bose-Einstein condensates (2015)

W. Muessel, H. Strobel, D. Linnemann, T. Zibold, B. Juliá-Díaz, and M. K. Oberthaler

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): W. Muessel, H. Strobel, D. Linnemann, T. Zibold, B. Juliá-Díaz, and M. K. Oberthaler We demonstrate experimentally an alternative method for the dynamic generation of atomic spin squeezing, building on the interplay between linear coupling and nonlinear phase evolution. Since the resulting quantum dynamics can be seen as rotation and shear on the generalized Bloch sphere, we call th… [Phys. Rev. A 92, 023603] Published Mon Aug 03, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Four-boson bound states from a functional renormalization group (2015)

Benjamín Jaramillo Ávila and Michael C. Birse

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Benjamín Jaramillo Ávila and Michael C. Birse We use the functional renormalization group to study the spectrum of three- and four-body states in bosonic systems around the unitary limit. Our effective action includes all energy-independent contact interactions in the four-atom sector, and we introduce a running trimer field to eliminate coupli… [Phys. Rev. A 92, 023601] Published Mon Aug 03, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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17

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Controlling disorder with periodically modulated interactions (2015)

Arkadiusz Kosior, Jan Major, Marcin Płodzień, and Jakub Zakrzewski

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): Arkadiusz Kosior, Jan Major, Marcin Płodzień, and Jakub Zakrzewski We investigate the celebrated problem of the one-dimensional tight-binding model in the presence of disorder leading to Anderson localization from a novel perspective. A binary disorder is assumed to be created by immobile, heavy particles that affect the motion of the lighter, mobile species in the… [Phys. Rev. A 92, 023606] Published Fri Aug 07, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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18

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Finding zeros of the Riemann zeta function by periodic driving of cold atoms (2015)

C. E. Creffield and G. Sierra

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-06-09

Beschreibung: Author(s): C. E. Creffield and G. Sierra The Riemann hypothesis, which states that the nontrivial zeros of the Riemann zeta function all lie on a certain line in the complex plane, is one of the most important unresolved problems in mathematics. We propose here an approach to finding a physical system to study the Riemann zeros, which is b... [Phys. Rev. A 91, 063608] Published Mon Jun 08, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Magnetism in the three-dimensional layered Lieb lattice: Enhanced transition temperature via flat-band and Van Hove singularities (2015)

Kazuto Noda, Kensuke Inaba, and Makoto Yamashita

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-06-09

Beschreibung: Author(s): Kazuto Noda, Kensuke Inaba, and Makoto Yamashita We describe the enhanced magnetic transition temperatures Tc of two-component fermions in three-dimensional layered Lieb lattices, which are created in cold-atom experiments. We determine the phase diagram at half filling using the dynamical mean-field theory. The dominant mechanism of enhanced Tc g... [Phys. Rev. A 91, 063610] Published Mon Jun 08, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Large effective three-body interaction in a double-well optical lattice (2015)

Saurabh Paul and Eite Tiesinga

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Saurabh Paul and Eite Tiesinga We study ultracold atoms in an optical lattice with two local minima per unit cell and show that the low-energy states of a multiband Bose-Hubbard (BH) Hamiltonian with only pairwise interactions are equivalent to an effective single-band Hamiltonian with strong three-body interactions. We focus on … [Phys. Rev. A 92, 023602] Published Mon Aug 03, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Sub- and supercritical defect scattering in Schrödinger chains with higher-order hopping (2015)

J. Stockhofe and P. Schmelcher

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): J. Stockhofe and P. Schmelcher We theoretically analyze a discrete Schrödinger chain with hopping to the first and second neighbors, as can be realized with zigzag arrangements of optical waveguides or lattice sites for cold atoms. Already at moderate values, second-neighbor hopping has a strong impact on the band structure, lead… [Phys. Rev. A 92, 023605] Published Fri Aug 07, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Drag dynamics in one-dimensional Fermi systems (2015)

Jun'ichi Ozaki, Masaki Tezuka, and Norio Kawakami

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): Jun'ichi Ozaki, Masaki Tezuka, and Norio Kawakami We study drag dynamics of several fermions in a fermion cloud in one-dimensional continuous systems, with particular emphasis on the nontrivial quantum many-body effects in systems whose parameters change gradually in real time. We adopt the Fermi-Hubbard model and the time-dependent density-matrix … [Phys. Rev. A 92, 023607] Published Fri Aug 07, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Quantum fluctuations in the BCS-BEC crossover of two-dimensional Fermi gases (2015)

Lianyi He, Haifeng Lü, Gaoqing Cao, Hui Hu, and Xia-Ji Liu

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-15

Beschreibung: Author(s): Lianyi He, Haifeng Lü, Gaoqing Cao, Hui Hu, and Xia-Ji Liu We present a theoretical study of the ground state of the BCS-BEC crossover in dilute two-dimensional Fermi gases. While the mean-field theory provides a simple and analytical equation of state, the pressure is equal to that of a noninteracting Fermi gas in the entire BCS-BEC crossover, which is not… [Phys. Rev. A 92, 023620] Published Fri Aug 14, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Real-time dynamics of an impurity in an ideal Bose gas in a trap (2015)

A. G. Volosniev, H.-W. Hammer, and N. T. Zinner

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-15

Beschreibung: Author(s): A. G. Volosniev, H.-W. Hammer, and N. T. Zinner We investigate the behavior of a harmonically trapped system consisting of an impurity in a dilute ideal Bose gas after the boson-impurity interaction is suddenly switched on. As a theoretical framework, we use a field-theory approach in the space-time domain within the T -matrix approximation. We es… [Phys. Rev. A 92, 023623] Published Fri Aug 14, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Coherent zero-field magnetization resonance in a dipolar spin-1 Bose-Einstein condensate (2015)

Wenxian Zhang, S. Yi, M. S. Chapman, and J. Q. You

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-13

Beschreibung: Author(s): Wenxian Zhang, S. Yi, M. S. Chapman, and J. Q. You With current magnetic-field shielding and high-precision detection in dipolar spinor Bose-Einstein condensates, it is possible to experimentally detect the low- or zero-field nonsecular dipolar dynamics. Here we analytically investigate the zero-field nonsecular magnetic dipolar interaction effect, … [Phys. Rev. A 92, 023615] Published Wed Aug 12, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Density-functional theory for the crystalline phases of a two-dimensional dipolar Fermi gas (2015)

B. P. van Zyl, W. Kirkby, and W. Ferguson

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-13

Beschreibung: Author(s): B. P. van Zyl, W. Kirkby, and W. Ferguson Density-functional theory is utilized to investigate the zero-temperature transition from a Fermi liquid to an inhomogeneous stripe, or Wigner crystal phase, predicted to occur in a one-component, spin-polarized, two-dimensional dipolar Fermi gas. Correlations are treated semiexactly within the loca… [Phys. Rev. A 92, 023614] Published Wed Aug 12, 2015

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Analytic models for the density of a ground-state spinor condensate (2015)

Sandeep Gautam and S. K. Adhikari

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-13

Beschreibung: Author(s): Sandeep Gautam and S. K. Adhikari We demonstrate that the ground state of a trapped spin-1 and spin-2 spinor ferromagnetic Bose-Einstein condensate (BEC) can be well approximated by a single decoupled Gross-Pitaevskii (GP) equation. Useful analytic models for the ground-state densities of ferromagnetic BECs are obtained from the Tho… [Phys. Rev. A 92, 023616] Published Wed Aug 12, 2015

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Controlled pairing symmetry of the superfluid state in systems of three-component repulsive fermionic atoms in optical lattices (2015)

Sei-ichiro Suga

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-13

Beschreibung: Author(s): Sei-ichiro Suga We investigate the pairing symmetry of the superfluid state in repulsively interacting three-component (color) fermionic atoms in optical lattices. When two of the three color-dependent repulsions are much stronger than the other, pairing symmetry is an extended s wave, although the superfluid state… [Phys. Rev. A 92, 023617] Published Wed Aug 12, 2015

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Generation and storage of spin-nematic squeezing in a spinor Bose-Einstein condensate (2015)

Yixiao Huang, Heng-Na Xiong, Zhe Sun, and Xiaoguang Wang

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-15

Beschreibung: Author(s): Yixiao Huang, Heng-Na Xiong, Zhe Sun, and Xiaoguang Wang We propose a scheme to store the spin-nematic squeezing in a spinor Bose-Einstein condensate by applying periodic microwave pulses. For a proper pulse period and phase shift, the squeezing can be enhanced and maintained for a long time, which realizes the storage of the maximal squeezing. We also pr… [Phys. Rev. A 92, 023622] Published Fri Aug 14, 2015

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Majorana fermions in quasi-one-dimensional and higher-dimensional ultracold optical lattices (2015)

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

American Physical Society (APS)

In: Physical Review A

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Beschreibung: Author(s): Chunlei Qu, Ming Gong, Yong Xu, Sumanta Tewari, and Chuanwei Zhang We study Majorana fermions (MFs) in quasi-one dimensional (quasi-1D) and higher-dimensional fermionic optical lattices with a strictly 1D spin-orbit coupling, which has already been realized in cold atom experiments. We show that when the superfluid order parameters are homogeneous and are enforced … [Phys. Rev. A 92, 023621] Published Fri Aug 14, 2015

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Demagnetization dynamics of noninteracting trapped fermions (2015)

Andrew P. Koller, Joshua Mundinger, Michael L. Wall, and Ana Maria Rey

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-09-11

Beschreibung: Author(s): Andrew P. Koller, Joshua Mundinger, Michael L. Wall, and Ana Maria Rey Motional effects on the demagnetization of trapped, noninteracting fermions are investigated, with dephasing time scales found to be faster than those observed in ultracold experiments for interacting cases; counterintuitively, spin-echo pulses — a technique widely used to regain magnetization — are found here to instead deteriorate the situation. [Phys. Rev. A 92, 033608] Published Thu Sep 10, 2015

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Relaxation dynamics of ultracold bosons in a double-well potential: Thermalization and prethermalization in a nearly integrable model (2015)

Jayson G. Cosme

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-09-11

Beschreibung: Author(s): Jayson G. Cosme We numerically investigate the relaxation dynamics in an isolated quantum system of interacting bosons trapped in a double-well potential after an integrability breaking quench. Using the statistics of the spectrum, we identify the postquench Hamiltonian as nonchaotic and close to integrability over… [Phys. Rev. A 92, 033607] Published Thu Sep 10, 2015

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Impurity in a Bose-Einstein condensate: Study of the attractive and repulsive branch using quantum Monte Carlo methods (2015)

L. A. Peña Ardila and S. Giorgini

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-09-16

Beschreibung: Author(s): L. A. Peña Ardila and S. Giorgini We investigate the properties of an impurity immersed in a dilute Bose gas at zero temperature using quantum Monte Carlo methods. The interactions between bosons are modeled by a hard-sphere potential with scattering length a , whereas the interactions between the impurity and the bosons are modeled … [Phys. Rev. A 92, 033612] Published Tue Sep 15, 2015

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Reservoir interactions during Bose-Einstein condensation: Modified critical scaling in the Kibble-Zurek mechanism of defect formation (2015)

R. G. McDonald and A. S. Bradley

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-09-22

Beschreibung: Author(s): R. G. McDonald and A. S. Bradley Defect formation in Bose-Einstein condensation is studied numerically by solving the stochastic projected Gross-Pitaevskii equation, where a departure from the known universality classes for this second-order phase transition emerges in the presence of energy-damping reservoir interactions. [Phys. Rev. A 92, 033616] Published Fri Sep 18, 2015

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Swallowtail structure in Fermi superfluids with periodically modulated interactions (2015)

Dongyang Yu, Wei Yi, and Wei Zhang

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-09-25

Beschreibung: Author(s): Dongyang Yu, Wei Yi, and Wei Zhang We study the superfluid flow in a quasi-one-dimensional Fermi gas with spatially modulated interactions induced by an optical Feshbach resonance. Due to the competition between the periodicity of the modulated interaction and the nonlinearity of the background interaction, an interesting swallowtail… [Phys. Rev. A 92, 033623] Published Thu Sep 24, 2015

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Mean-field yrast spectrum and persistent currents in a two-component Bose gas with interaction asymmetry (2015)

Z. Wu, E. Zaremba, J. Smyrnakis, M. Magiropoulos, Nikolaos K. Efremidis, and G. M. Kavoulakis

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-09-30

Beschreibung: Author(s): Z. Wu, E. Zaremba, J. Smyrnakis, M. Magiropoulos, Nikolaos K. Efremidis, and G. M. Kavoulakis We analyze the mean-field yrast spectrum of a two-component Bose gas in the ring geometry with arbitrary interaction asymmetry. Of particular interest is the possibility that the yrast spectrum develops local minima at which persistent superfluid flow can occur. By analyzing the mean-field energy fu… [Phys. Rev. A 92, 033630] Published Tue Sep 29, 2015

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Quantum impurity in a one-dimensional trapped Bose gas (2015)

A. S. Dehkharghani, A. G. Volosniev, and N. T. Zinner

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-09-30

Beschreibung: Author(s): A. S. Dehkharghani, A. G. Volosniev, and N. T. Zinner We present a theoretical framework for describing an impurity in a trapped Bose system in one spatial dimension. The theory handles any external confinement, arbitrary mass ratios, and a weak interaction may be included between the Bose particles. To demonstrate our technique, we calculate the groun… [Phys. Rev. A 92, 031601(R)] Published Tue Sep 29, 2015

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Spreading of entanglement and steering along small Bose-Hubbard chains (2015)

M. K. Olsen

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-09-29

Beschreibung: Author(s): M. K. Olsen We investigate how entanglement spreads along small Bose-Hubbard chains, with only the first well initially occupied by a mesoscopic number of atoms, as the number of sites increases. For two- and three-well chains in the noninteracting case, we are able to obtain analytical solutions and show that … [Phys. Rev. A 92, 033627] Published Mon Sep 28, 2015

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π Berry phase and topological excitation in interacting boson-fermion mixtures (2015)

Huaiming Guo

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-09-29

Beschreibung: Author(s): Huaiming Guo The topological property of a boson-fermion mixture in a one-dimensional optical superlattice is studied and the topological insulating phase of an interacting boson-fermion mixture characterized by a nontrivial Berry phase is identified. The single-particle and boson-fermion exchanging excitation s… [Phys. Rev. A 92, 033625] Published Mon Sep 28, 2015

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Enhancing quantum coherence with short-range correlated disorder (2015)

P. Capuzzi, M. Gattobigio, and P. Vignolo

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-11-21

Beschreibung: Author(s): P. Capuzzi, M. Gattobigio, and P. Vignolo We introduce a two-dimensional short-range correlated disorder that is the natural generalization of the well-known one-dimensional dual random dimer model [D. H. Dunlap et al. , Phys. Rev. Lett. 65 , 88 (1990) ]. We demonstrate that, as in one dimension, this model induces a localization-delocalizati… [Phys. Rev. A 92, 053622] Published Fri Nov 20, 2015

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Phase diagram of the three-dimensional Anderson model for short-range speckle potentials (2015)

M. Pasek, Z. Zhao, D. Delande, and G. Orso

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-11-19

Beschreibung: Author(s): M. Pasek, Z. Zhao, D. Delande, and G. Orso A discrepancy between existing theories and essentially exact numerical results on the asymmetry of the mobility edge for Anderson localization is now resolved, where an improved single-particle Green’s function — a crucial component that could be used in existing theories for other relevant studies — is found to bridge the gap. [Phys. Rev. A 92, 053618] Published Wed Nov 18, 2015

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Effects of gapless bosonic fluctuations on Majorana fermions in an atomic wire coupled to a molecular reservoir (2015)

Ying Hu and Mikhail A. Baranov

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-11-19

Beschreibung: Author(s): Ying Hu and Mikhail A. Baranov We discuss the effects of quantum and thermal fluctuations on the Majorana edge states in a topological atomic wire coupled to a superfluid molecular gas with gapless excitations. We find that the coupling between the Majorana edge states remains exponentially decaying with the length of the wire, e… [Phys. Rev. A 92, 053615] Published Tue Nov 17, 2015

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Nonlinear dressed states at the miscibility-immiscibility threshold (2015)

E. Nicklas, W. Muessel, H. Strobel, P. G. Kevrekidis, and M. K. Oberthaler

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-11-19

Beschreibung: Author(s): E. Nicklas, W. Muessel, H. Strobel, P. G. Kevrekidis, and M. K. Oberthaler The dynamical evolution of spatial patterns in a complex system can reveal the underlying structure and stability of stationary states. As a model system we employ a two-component Bose-Einstein condensate at the transition from miscible to immiscible with the additional control of linear interconver… [Phys. Rev. A 92, 053614] Published Tue Nov 17, 2015

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Absence of a four-body Efimov effect in the 2+2 fermionic problem (2015)

Shimpei Endo and Yvan Castin

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-11-26

Beschreibung: Author(s): Shimpei Endo and Yvan Castin In the free three-dimensional space, we consider a pair of identical ↑ fermions of some species or in some internal state and a pair of identical ↓ fermions of another species or in another state. There is a resonant s -wave interaction (that is, of zero range and infinite scattering length) between … [Phys. Rev. A 92, 053624] Published Tue Nov 24, 2015

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PT-symmetric currents of a Bose-Einstein condensate in a triple well (2015)

Daniel Haag, Dennis Dast, Holger Cartarius, and Günter Wunner

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-11-26

Beschreibung: Author(s): Daniel Haag, Dennis Dast, Holger Cartarius, and Günter Wunner Conditions for stationary currents in a P T -symmetric, non-Hermitian system are studied in the presence of degeneracy, where it is found that the general absence of such currents can be reverted by having a nonlinear interaction in systems such as Bose-Einstein condensates. [Phys. Rev. A 92, 053627] Published Wed Nov 25, 2015

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Tunable defect interactions and supersolidity in dipolar quantum gases on a lattice potential (2015)

Wolfgang Lechner, Fabio Cinti, and Guido Pupillo

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-11-26

Beschreibung: Author(s): Wolfgang Lechner, Fabio Cinti, and Guido Pupillo Point defects in self-assembled crystals, such as vacancies and interstitials, attract each other and form stable clusters. This leads to a phase separation between perfect crystalline structures and defect conglomerates at low temperatures. We propose a method that allows one to tune the effective … [Phys. Rev. A 92, 053625] Published Tue Nov 24, 2015

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Collective oscillations of a trapped quantum gas in low dimensions (2015)

Giulia De Rosi and Sandro Stringari

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-11-19

Beschreibung: Author(s): Giulia De Rosi and Sandro Stringari We present a comprehensive study of the discretized modes of an atomic gas in different conditions of confinement. Starting from the equations of hydrodynamics we derive a closed equation for the velocity field, depending on the adiabatic and isothermal compressibilities and applicable to different … [Phys. Rev. A 92, 053617] Published Wed Nov 18, 2015

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Time-of-flight images of Mott insulators in the Hofstadter-Bose-Hubbard model (2015)

M. Iskin

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-27

Beschreibung: Author(s): M. Iskin We analyze the momentum distribution function and its artificial-gauge-field dependence for the Mott insulator phases of the Hofstadter-Bose-Hubbard model. By benchmarking the results of the random-phase approximation approach against those of the strong-coupling expansion for the Landau and symmetr… [Phys. Rev. A 92, 023636] Published Wed Aug 26, 2015

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Beliaev damping of the Goldstone mode in atomic Fermi superfluids (2015)

G. Bighin, L. Salasnich, P. A. Marchetti, and F. Toigo

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-27

Beschreibung: Author(s): G. Bighin, L. Salasnich, P. A. Marchetti, and F. Toigo Beliaev damping in a superfluid is the decay of a collective excitation into two lower-frequency collective excitations; it represents the only decay mode for a bosonic collective excitation in a superfluid at T = 0 . The standard treatment for this decay assumes a linear spectrum, which in turn implie… [Phys. Rev. A 92, 023638] Published Wed Aug 26, 2015

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Tuning energy transport using interacting vibrational modes (2015)

Chu Guo, Manas Mukherjee, and Dario Poletti

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-27

Beschreibung: Author(s): Chu Guo, Manas Mukherjee, and Dario Poletti We study energy transport in a chain of quantum harmonic and anharmonic oscillators where the anharmonicity is induced by interaction between local vibrational states of the chain. Using adiabatic elimination and numerical simulations with matrix product states, we show how strong interactions signi… [Phys. Rev. A 92, 023637] Published Wed Aug 26, 2015

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Spin structure of harmonically trapped one-dimensional atoms with spin-orbit coupling (2015)

Q. Guan and D. Blume

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-29

Beschreibung: Author(s): Q. Guan and D. Blume We introduce a theoretical approach to determine the spin structure of harmonically trapped atoms with two-body zero-range interactions subject to an equal mixture of Rashba and Dresselhaus spin-orbit coupling created through Raman coupling of atomic hyperfine states. The spin structure of bosonic a… [Phys. Rev. A 92, 023641] Published Fri Aug 28, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Effects of anisotropy in simple lattice geometries on many-body properties of ultracold fermions in optical lattices (2015)

Anna Golubeva, Andrii Sotnikov, and Walter Hofstetter

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-10-27

Beschreibung: Author(s): Anna Golubeva, Andrii Sotnikov, and Walter Hofstetter We study the effects of anisotropic hopping amplitudes on quantum phases of ultracold fermions in optical lattices described by the repulsive Fermi-Hubbard model. In particular, using dynamical mean-field theory (DMFT) we investigate the dimensional crossover between the isotropic square and the iso… [Phys. Rev. A 92, 043623] Published Mon Oct 26, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Thermometry of ultracold fermions by (super)lattice modulation spectroscopy (2015)

Karla Loida, Ameneh Sheikhan, and Corinna Kollath

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-10-27

Beschreibung: Author(s): Karla Loida, Ameneh Sheikhan, and Corinna Kollath We theoretically consider noninteracting fermions confined to optical lattices and apply a lattice amplitude modulation that we choose to be either homogeneous or of superlattice geometry. We study the atom excitation rate to higher Bloch bands which can be measured by adiabatic band mapping. We fin… [Phys. Rev. A 92, 043624] Published Mon Oct 26, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Analysis beyond the Thomas-Fermi approximation of the density profiles of a miscible two-component Bose-Einstein condensate (2015)

J. Polo, V. Ahufinger, P. Mason, S. Sridhar, T. P. Billam, and S. A. Gardiner

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-05-29

Beschreibung: Author(s): J. Polo, V. Ahufinger, P. Mason, S. Sridhar, T. P. Billam, and S. A. Gardiner We investigate a harmonically trapped two-component Bose-Einstein condensate within the miscible regime, close to its boundaries, for different ratios of effective intra- and interspecies interactions. We derive analytically a universal equation for the density around the different boundaries in one... [Phys. Rev. A 91, 053626] Published Wed May 27, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Quantum phases of Bose-Einstein condensates with synthetic spin–orbital-angular-momentum coupling (2015)

Chunlei Qu, Kuei Sun, and Chuanwei Zhang

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-05-30

Beschreibung: Author(s): Chunlei Qu, Kuei Sun, and Chuanwei Zhang The experimental realization of emergent spin-orbit coupling through laser-induced Raman transitions in ultracold atoms paves the way for exploring novel superfluid physics and simulating exotic many-body phenomena. A recent proposal with the use of Laguerre-Gaussian lasers enables another fundament... [Phys. Rev. A 91, 053630] Published Thu May 28, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Quantum sound-cone fluctuations in cold Fermi gases: Phonon propagation (2015)

Jen-Tsung Hsiang, Da-Shin Lee, Chi-Yong Lin, and Ray J. Rivers

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-05-29

Beschreibung: Author(s): Jen-Tsung Hsiang, Da-Shin Lee, Chi-Yong Lin, and Ray J. Rivers We examine the effect of quantum fluctuations in a tunable cold Fermi gas on phonon propagation. We show that these fluctuations can be interpreted as inducing a stochastic space-time. This effect can be displayed in the variation in the travel time of phonons, at its greatest in the crossover regio... [Phys. Rev. A 91, 051603(R)] Published Wed May 27, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Polarization-induced phase separation and re-entrant transition of two-component fermions in a one-dimensional lattice (2015)

Theja N. De Silva

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-05-29

Beschreibung: Author(s): Theja N. De Silva By investigating the compressibility of one-dimensional lattice fermions at various filling factors, we study the phase separation and re-entrant transition within the framework of the Bethe ansatz method. We model the system using the repulsive Hubbard model and calculate compressibility as a funct... [Phys. Rev. A 91, 053627] Published Wed May 27, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Temporal decay of Néel order in the one-dimensional Fermi-Hubbard model (2015)

A. Bauer, F. Dorfner, and F. Heidrich-Meisner

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-05-29

Beschreibung: Author(s): A. Bauer, F. Dorfner, and F. Heidrich-Meisner Motivated by recent experiments with ultracold quantum gases in optical lattices we study the decay of the staggered moment in the one-dimensional Fermi-Hubbard model starting from a perfect Néel state using exact diagonalization and the infinite-system-size time-evolving-block-decimation method. Th... [Phys. Rev. A 91, 053628] Published Wed May 27, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Interference effects in potential wells (2015)

W. J. Mullin and F. Laloë

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-05-29

Beschreibung: Author(s): W. J. Mullin and F. Laloë We propose using an array of potential wells as an interferometer in which the beam splitters are provided by tunneling during an appropriate time through the barrier between wells. This arrangement allows demonstration of generalized Hong-Ou-Mandel effects with multiple particles traversing one or ... [Phys. Rev. A 91, 053629] Published Wed May 27, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Energy, contact, and density profiles of one-dimensional fermions in a harmonic trap via nonuniform-lattice Monte Carlo calculations (2015)

C. E. Berger, E. R. Anderson, and J. E. Drut

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-05-27

Beschreibung: Author(s): C. E. Berger, E. R. Anderson, and J. E. Drut We determine the ground-state energy and Tan's contact of attractively interacting few-fermion systems in a one-dimensional harmonic trap, for a range of couplings and particle numbers. Complementing those results, we show the corresponding density profiles. The calculations were performed with a la... [Phys. Rev. A 91, 053618] Published Wed May 20, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Dipolar Bose gas in a weak isotropic speckle disorder (2015)

Abdelâali Boudjemâa

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-05-27

Beschreibung: Author(s): Abdelâali Boudjemâa We investigate the properties of a homogeneous dipolar Bose gas in a weak three-dimensional isotropic speckle disorder at finite temperatures. By using the Bogoliubov theory (beyond the mean field), we calculate the condensate and the superfluid fractions as a function of density and strengths of di... [Phys. Rev. A 91, 053619] Published Wed May 20, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Repulsive atomic Fermi gas with Rashba spin-orbit coupling: A quantum Monte Carlo study (2015)

Alberto Ambrosetti, Pier Luigi Silvestrelli, Francesco Pederiva, Lubos Mitas, and Flavio Toigo

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-05-27

Beschreibung: Author(s): Alberto Ambrosetti, Pier Luigi Silvestrelli, Francesco Pederiva, Lubos Mitas, and Flavio Toigo Thanks to the recent experimental realization and control of artificial gauge fields, spin-orbit (SO) couplings are witnessing an ever increasing interest in the field of cold atoms. However, predicting their effect on spin polarization and energetic properties of interacting systems is a major chal... [Phys. Rev. A 91, 053622] Published Tue May 26, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Variance as a sensitive probe of correlations (2015)

Shachar Klaiman and Ofir E. Alon

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-06-13

Beschreibung: Author(s): Shachar Klaiman and Ofir E. Alon Bose-Einstein condensates made of ultracold trapped bosonic atoms have become a central venue in which interacting many-body quantum systems are studied. The ground state of a trapped Bose-Einstein condensate has been proven to be 100% condensed in the limit of infinite particle number and constant ... [Phys. Rev. A 91, 063613] Published Fri Jun 12, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Wave-packet dynamics of noninteracting ultracold bosons in an amplitude-modulated parabolic optical lattice (2015)

Tomotake Yamakoshi and Shinichi Watanabe

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-06-13

Beschreibung: Author(s): Tomotake Yamakoshi and Shinichi Watanabe The recent Aarhus experiment [ Phys. Rev. A 88 , 023620 (2013) ] produced wave packets by applying amplitude modulation to a trapped Bose–Einstein condensate (BEC) of Rb 87 using an optical lattice. The present paper renders a theoretical account of this experimental production of wave packets and their... [Phys. Rev. A 91, 063614] Published Fri Jun 12, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Differential phase extraction in an atom gradiometer (2015)

F. Pereira Dos Santos

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-06-13

Beschreibung: Author(s): F. Pereira Dos Santos We present here a method for the extraction of the differential phase of an atom gradiometer that exploits the correlation of the vibration signal measured by an auxiliary classical sensor, such as a seismometer or an accelerometer. We show that sensitivities close to the quantum projection noise li... [Phys. Rev. A 91, 063615] Published Fri Jun 12, 2015

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Constraining the generalized uncertainty principle with cold atoms (2016)

Dongfeng Gao and Mingsheng Zhan

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2016-07-15

Beschreibung: Author(s): Dongfeng Gao and Mingsheng Zhan Various theories of quantum gravity predict the existence of a minimum length scale, which implies the Planck-scale modifications of the Heisenberg uncertainty principle to a so-called generalized uncertainty principle (GUP). Previous studies of the GUP focused on its implications for high-energy ph… [Phys. Rev. A 94, 013607] Published Thu Jul 14, 2016

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Bosonic Josephson effect in the Fano-Anderson model (2016)

G. Engelhardt, G. Schaller, and T. Brandes

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2016-07-15

Beschreibung: Author(s): G. Engelhardt, G. Schaller, and T. Brandes We investigate the coherent dynamics of a noninteracting Bose-Einstein condensate in a system consisting of two bosonic reservoirs coupled via a spatially localized mode. We describe this system by a two-terminal Fano-Anderson model and investigate analytically the time evolution of observables such… [Phys. Rev. A 94, 013608] Published Thu Jul 14, 2016

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Beyond Gaussian pair fluctuation theory for strongly interacting Fermi gases (2016)

Brendan C. Mulkerin, Xia-Ji Liu, and Hui Hu

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2016-07-19

Beschreibung: Author(s): Brendan C. Mulkerin, Xia-Ji Liu, and Hui Hu Interacting Fermi systems in the strongly correlated regime play a fundamental role in many areas of physics and are of particular interest to the condensed matter community. Though weakly interacting fermions are understood, strongly correlated fermions are difficult to describe theoretically as th… [Phys. Rev. A 94, 013610] Published Mon Jul 18, 2016

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Finite-speed-of-light perturbation in atom gravimeters (2016)

Yu-Jie Tan, Cheng-Gang Shao, and Zhong-Kun Hu

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2016-07-21

Beschreibung: Author(s): Yu-Jie Tan, Cheng-Gang Shao, and Zhong-Kun Hu The finite-speed-of-light (FSL) effect is a systematic error in atom gravimeters arising from the time delay due to the propagation of the light. It includes the frequency-chirp-independent part and the frequency-chirp-dependent part, which were not considered completely. The FSL effect in atom grav… [Phys. Rev. A 94, 013612] Published Wed Jul 20, 2016

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Engineering many-body dynamics with quantum light potentials and measurements (2016)

T. J. Elliott and I. B. Mekhov

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2016-07-22

Beschreibung: Author(s): T. J. Elliott and I. B. Mekhov Interactions between many-body atomic systems in optical lattices and light in cavities induce long-range and correlated atomic dynamics beyond the standard Bose-Hubbard model, due to the global nature of the light modes. We characterize these processes, and show that uniting such phenomena with dyn… [Phys. Rev. A 94, 013614] Published Thu Jul 21, 2016

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Dynamics of Hubbard Hamiltonians with the multiconfigurational time-dependent Hartree method for indistinguishable particles (2016)

Axel U. J. Lode and Christoph Bruder

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2016-07-23

Beschreibung: Author(s): Axel U. J. Lode and Christoph Bruder We apply the multiconfigurational time-dependent Hartree method for indistinguishable particles (MCTDH-X) to systems of bosons or fermions in lattices described by Hubbard-type Hamiltonians with long-range or short-range interparticle interactions. The wave function is expanded in a variationally op… [Phys. Rev. A 94, 013616] Published Fri Jul 22, 2016

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Theory for Bose-Einstein condensation of light in nanofabricated semiconductor microcavities (2016)

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

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2016-07-23

Beschreibung: Author(s): A.-W. de Leeuw, E. C. I. van der Wurff, R. A. Duine, D. van Oosten, and H. T. C. Stoof We construct a theory for Bose-Einstein condensation of light in nanofabricated semiconductor microcavities. We model the semiconductor by one conduction and one valence band which consist of electrons and holes that interact via a Coulomb interaction. Moreover, we incorporate screening effects by u… [Phys. Rev. A 94, 013615] Published Fri Jul 22, 2016

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Information and backaction due to phase-contrast-imaging measurements of cold atomic gases: Beyond Gaussian states (2016)

Ebubechukwu O. Ilo-Okeke and Tim Byrnes

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2016-07-26

Beschreibung: Author(s): Ebubechukwu O. Ilo-Okeke and Tim Byrnes We further examine a theory of phase contrast imaging (PCI) of cold atomic gases, first introduced by us in Phys. Rev. Lett. 112 , 233602 (2014) . We model the PCI measurement by directly calculating the entangled state between the light and the atoms due to the ac Stark shift, which induces a conditi… [Phys. Rev. A 94, 013617] Published Mon Jul 25, 2016

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Decoherence of an impurity in a one-dimensional fermionic bath with mass imbalance (2016)

A.-M. Visuri, J. J. Kinnunen, J. E. Baarsma, and P. Törmä

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2016-07-29

Beschreibung: Author(s): A.-M. Visuri, J. J. Kinnunen, J. E. Baarsma, and P. Törmä We study the transport, decoherence, and the dissipation of the kinetic energy of a mobile impurity interacting with a bath of free fermions in a one-dimensional lattice. Numerical simulations are made with the time-evolving block decimation method, starting from a state where the impurity and bath … [Phys. Rev. A 94, 013619] Published Thu Jul 28, 2016

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Generalized Hartree-Fock-Bogoliubov description of the Fröhlich polaron (2016)

Ben Kain and Hong Y. Ling

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2016-07-30

Beschreibung: Author(s): Ben Kain and Hong Y. Ling We adapt the generalized Hartree-Fock-Bogoliubov (HFB) method to an interacting many-phonon system free of impurities. The many-phonon system is obtained from applying the Lee-Low-Pine (LLP) transformation to the Fröhlich model which describes a mobile impurity coupled to noninteracting phonons. We … [Phys. Rev. A 94, 013621] Published Fri Jul 29, 2016

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Robustness of topologically protected edge states in quantum walk experiments with neutral atoms (2016)

Thorsten Groh, Stefan Brakhane, Wolfgang Alt, Dieter Meschede, Janos K. Asbóth, and Andrea Alberti

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2016-07-30

Beschreibung: Author(s): Thorsten Groh, Stefan Brakhane, Wolfgang Alt, Dieter Meschede, Janos K. Asbóth, and Andrea Alberti Robustness of topologically protected edge states in quantum walk experiments is studied with ultracold atoms in optical lattices; it is found that environment-induced decoherence may lead to exponential decay of the edge states into bulk states. [Phys. Rev. A 94, 013620] Published Fri Jul 29, 2016

Schlagwort(e): Matter waves and collective properties of cold atoms and molecules

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Effects of long-range hopping and interactions on quantum walks in ordered and disordered lattices (2016)

T. Chattaraj and R. V. Krems

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2016-08-02

Beschreibung: Author(s): T. Chattaraj and R. V. Krems We study the effects of long-range hopping and long-range interparticle interactions on the quantum walk of hard-core bosons in ideal and disordered one-dimensional lattices. We find that the range of hopping has a much more significant effect on the particle correlation dynamics than the range of i… [Phys. Rev. A 94, 023601] Published Mon Aug 01, 2016

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Quantum rotor theory of systems of spin-2 bosons (2016)

Matjaž Payrits and Ryan Barnett

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2016-08-03

Beschreibung: Author(s): Matjaž Payrits and Ryan Barnett We consider quantum phases of tightly confined spin-2 bosons in an external field under the presence of rotationally invariant interactions. Generalizing previous treatments, we show how this system can be mapped onto a quantum rotor model. Within the rotor framework, low-energy excitations about fr… [Phys. Rev. A 94, 023605] Published Tue Aug 02, 2016

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Effect of anisotropic exchange interactions and short-range phenomena on superfluidity in a homogeneous dipolar Fermi gas (2016)

I. Corro and A. M. Martin

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2016-08-03

Beschreibung: Author(s): I. Corro and A. M. Martin We develop a simple numerical method that allows us to calculate the BCS superfluid transition temperature T c precisely for any interaction potential. We apply it to a polarized, ultracold Fermi gas with long-range, anisotropic, dipolar interactions and include the effects of anisotropic exchange in… [Phys. Rev. A 94, 023603] Published Tue Aug 02, 2016

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Momentum distributions and numerical methods for strongly interacting one-dimensional spinor gases (2016)

F. Deuretzbacher, D. Becker, and L. Santos

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2016-08-05

Beschreibung: Author(s): F. Deuretzbacher, D. Becker, and L. Santos One-dimensional spinor gases with strong δ interaction fermionize and form a spin chain. The spatial degrees of freedom of this atom chain can be described by a mapping to spinless noninteracting fermions and the spin degrees of freedom are described by a spin-chain model with nearest-neighbor inter… [Phys. Rev. A 94, 023606] Published Thu Aug 04, 2016

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Matter-wave grating distinguishing conservative and dissipative interactions (2016)

Robert P. Cameron, Jörg B. Götte, Stephen M. Barnett, and J. P. Cotter

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2016-07-12

Beschreibung: Author(s): Robert P. Cameron, Jörg B. Götte, Stephen M. Barnett, and J. P. Cotter We propose an optical grating for matter waves that separates molecules depending on whether their interaction with the light is conservative or dissipative. Potential applications include fundamental tests of quantum mechanics, measurement of molecular properties, and the ability to selectively pre… [Phys. Rev. A 94, 013604] Published Mon Jul 11, 2016

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Phase separation and dynamics of two-component Bose-Einstein condensates (2016)

Kean Loon Lee, Nils B. Jørgensen, I-Kang Liu, Lars Wacker, Jan J. Arlt, and Nick P. Proukakis

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2016-07-12

Beschreibung: Author(s): Kean Loon Lee, Nils B. Jørgensen, I-Kang Liu, Lars Wacker, Jan J. Arlt, and Nick P. Proukakis The miscibility of two interacting quantum systems is an important testing ground for the understanding of complex quantum systems. Two-component Bose-Einstein condensates enable the investigation of this scenario in a particularly well controlled setting. In a homogeneous system, the transition bet… [Phys. Rev. A 94, 013602] Published Mon Jul 11, 2016

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Critical points of the anyon-Hubbard model (2016)

J. Arcila-Forero, R. Franco, and J. Silva-Valencia

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2016-07-20

Beschreibung: Author(s): J. Arcila-Forero, R. Franco, and J. Silva-Valencia Anyons are particles with fractional statistics that exhibit a nontrivial change in the wave function under an exchange of particles. Anyons can be considered to be a general category of particles that interpolate between fermions and bosons. We determined the position of the critical points of the … [Phys. Rev. A 94, 013611] Published Tue Jul 19, 2016

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Dynamics and thermalization of a Bose-Einstein condensate in a Sinai-oscillator trap (2016)

Leonardo Ermann, Eduardo Vergini, and Dima L. Shepelyansky

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2016-07-26

Beschreibung: Author(s): Leonardo Ermann, Eduardo Vergini, and Dima L. Shepelyansky We study numerically the evolution of Bose-Einstein condensate in the Sinai-oscillator trap described by the Gross-Pitaevskii equation in two dimensions. In the absence of interactions, this trap mimics the properties of Sinai billiards where the classical dynamics is chaotic and the quantum evoluti… [Phys. Rev. A 94, 013618] Published Mon Jul 25, 2016

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Theory of the vortex-clustering transition in a confined two-dimensional quantum fluid (2016)

Xiaoquan Yu, Thomas P. Billam, Jun Nian, Matthew T. Reeves, and Ashton S. Bradley

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2016-08-02

Beschreibung: Author(s): Xiaoquan Yu, Thomas P. Billam, Jun Nian, Matthew T. Reeves, and Ashton S. Bradley Clustering of like-sign vortices in a planar bounded domain is known to occur at negative temperature, a phenomenon that Onsager demonstrated to be a consequence of bounded phase space. In a confined superfluid, quantized vortices can support such an ordered phase, provided they evolve as an almost … [Phys. Rev. A 94, 023602] Published Mon Aug 01, 2016

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Ballistic quench-induced correlation waves in ultracold gases (2016)

John P. Corson and John L. Bohn

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2016-08-03

Beschreibung: Author(s): John P. Corson and John L. Bohn We investigate the wave-packet dynamics of a pair of particles that undergoes a rapid change of scattering length. The short-range interactions are modeled in the zero-range limit, where the quench is accomplished by switching the boundary condition of the wave function at vanishing particle separat… [Phys. Rev. A 94, 023604] Published Tue Aug 02, 2016

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Disappearance of quasiparticles in a Bose lattice gas (2016)

David Chen, Carolyn Meldgin, Philip Russ, Brian De; Marco, and Erich Mueller

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2016-08-04

Beschreibung: Author(s): David Chen, Carolyn Meldgin, Philip Russ, Brian DeMarco, and Erich Mueller We use a momentum-space hole-burning technique implemented via stimulated Raman transitions to measure the momentum relaxation time for a gas of bosonic atoms trapped in an optical lattice. By changing the lattice potential depth, we observe a smooth crossover between relaxation times larger and sma… [Phys. Rev. A 94, 021601(R)] Published Wed Aug 03, 2016

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Sudden-quench dynamics of Bardeen-Cooper-Schrieffer states in deep optical lattices (2016)

Marlon Nuske, L. Mathey, and Eite Tiesinga

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2016-08-06

Beschreibung: Author(s): Marlon Nuske, L. Mathey, and Eite Tiesinga We determine the exact dynamics of an initial Bardeen-Cooper-Schrieffer (BCS) state of ultracold atoms in a deep hexagonal optical lattice. The dynamical evolution is triggered by a quench of the lattice potential such that the interaction strength U f is much larger than the hopping amplitude J f . Th… [Phys. Rev. A 94, 023607] Published Fri Aug 05, 2016

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Hidden-symmetry-protected quantum pseudo–spin Hall effect in optical lattices (2016)

Jing-Min Hou and Wei Chen

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2016-06-21

Beschreibung: Author(s): Jing-Min Hou and Wei Chen We propose a scheme to realize a Z 2 topological insulator in a square optical lattice. Different from the conventional topological insulator protected by the time-reversal symmetry, here the optical lattice possesses a hidden symmetry, which is responsible for the present Z 2 topological order. With … [Phys. Rev. A 93, 063626] Published Mon Jun 20, 2016

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Properties of the single-site reduced density matrix in the Bose-Bose resonance model in the ground state and in quantum quenches (2016)

F. Dorfner and F. Heidrich-Meisner

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2016-06-21

Beschreibung: Author(s): F. Dorfner and F. Heidrich-Meisner We study properties of the single-site reduced density matrix in the Bose-Bose resonance model as a function of system parameters. This model describes a single-component Bose gas with a resonant coupling to a diatomic molecular state, here defined on a lattice. A main goal is to demonstrate that th… [Phys. Rev. A 93, 063624] Published Mon Jun 20, 2016

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Spin-1 quantum walks (2016)

Daichi Morita, Toshihiro Kubo, Yasuhiro Tokura, and Makoto Yamashita

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2016-06-21

Beschreibung: Author(s): Daichi Morita, Toshihiro Kubo, Yasuhiro Tokura, and Makoto Yamashita We study the quantum walks of two interacting spin-1 bosons. We derive an exact solution for the time-dependent wave function, which describes the two-particle dynamics governed by the one-dimensional spin-1 Bose-Hubbard model. We show that propagation dynamics in real space and mixing dynamics in s… [Phys. Rev. A 93, 063625] Published Mon Jun 20, 2016

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Ground-state properties of hard-core anyons in a harmonic potential (2016)

Yajiang Hao

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2016-06-22

Beschreibung: Author(s): Yajiang Hao Using an anyon-fermion mapping method, we investigate the ground-state properties of hard-core anyons confined in a one-dimensional harmonic trap. The concise analytical formula of the reduced one-body density matrix is obtained. Based on this formula, we evaluated the momentum distribution, the nat… [Phys. Rev. A 93, 063627] Published Tue Jun 21, 2016

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Bragg interferometer for gravity gradient measurements (2016)

G. D'Amico, F. Borselli, L. Cacciapuoti, M. Prevedelli, G. Rosi, F. Sorrentino, and G. M. Tino

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2016-06-24

Beschreibung: Author(s): G. D'Amico, F. Borselli, L. Cacciapuoti, M. Prevedelli, G. Rosi, F. Sorrentino, and G. M. Tino We report on the characterization of a dual cloud atom interferometer for gravity gradient measurements using third-order Bragg diffraction as atom optical elements. We study the dependence of the contrast and the gradiometer phase angle against the relevant experimental parameters and characterize … [Phys. Rev. A 93, 063628] Published Wed Jun 22, 2016

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Fermi polaron in a one-dimensional quasiperiodic optical lattice: The simplest many-body localization challenge (2016)

Hui Hu, An-Bang Wang, Su Yi, and Xia-Ji Liu

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2016-05-04

Beschreibung: Author(s): Hui Hu, An-Bang Wang, Su Yi, and Xia-Ji Liu We theoretically investigate the behavior of a moving impurity immersed in a sea of fermionic atoms that are confined in a quasiperiodic (bichromatic) optical lattice within a standard variational approach. We consider both repulsive and attractive contact interactions for such a simple many-body lo… [Phys. Rev. A 93, 053601] Published Mon May 02, 2016

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Spin Hall effect in a spinor dipolar Bose-Einstein condensate (2016)

T. Oshima and Y. Kawaguchi

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2016-05-06

Beschreibung: Author(s): T. Oshima and Y. Kawaguchi We theoretically show that the spin Hall effect arises in a Bose-Einstein condensate (BEC) of neutral atoms interacting via the magnetic dipole-dipole interactions (MDDIs). Since the MDDI couples the total spin angular momentum and the relative orbital angular momentum of two colliding atoms, it wor… [Phys. Rev. A 93, 053605] Published Thu May 05, 2016

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Sagnac interferometry with coherent vortex superposition states in exciton-polariton condensates (2016)

Frederick Ira Moxley, III, Jonathan P. Dowling, Weizhong Dai, and Tim Byrnes

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2016-05-05

Beschreibung: Author(s): Frederick Ira Moxley, III, Jonathan P. Dowling, Weizhong Dai, and Tim Byrnes We investigate prospects of using counter-rotating vortex superposition states in nonequilibrium exciton-polariton Bose-Einstein condensates for the purposes of Sagnac interferometry. We first investigate the stability of vortex-antivortex superposition states, and show that they survive at steady s… [Phys. Rev. A 93, 053603] Published Wed May 04, 2016

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Numerical study of the unitary Fermi gas across the superfluid transition (2016)

Olga Goulko and Matthew Wingate

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2016-05-05

Beschreibung: Author(s): Olga Goulko and Matthew Wingate We present results from Monte Carlo calculations investigating the properties of the homogeneous, spin-balanced unitary Fermi gas in three dimensions. The temperature is varied across the superfluid transition allowing us to determine the temperature dependence of the chemical potential, the energy … [Phys. Rev. A 93, 053604] Published Wed May 04, 2016

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Realizing exactly solvable SU(N) magnets with thermal atoms (2016)

Michael E. Beverland, Gorjan Alagic, Michael J. Martin, Andrew P. Koller, Ana M. Rey, and Alexey V. Gorshkov

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2016-05-07

Beschreibung: Author(s): Michael E. Beverland, Gorjan Alagic, Michael J. Martin, Andrew P. Koller, Ana M. Rey, and Alexey V. Gorshkov We show that n thermal fermionic alkaline-earth-metal atoms in a flat-bottom trap allow one to robustly implement a spin model displaying two symmetries: the S n symmetry that permutes atoms occupying different vibrational levels of the trap and the SU ( N ) symmetry associated with N nuclear spin state… [Phys. Rev. A 93, 051601(R)] Published Fri May 06, 2016

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Coherence of interacting bosons in optical lattices in synthetic magnetic fields with a large number of subbands (2016)

B. Grygiel, K. Patucha, and T. A. Zaleski

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2016-05-10

Beschreibung: Author(s): B. Grygiel, K. Patucha, and T. A. Zaleski We study the behavior of interacting ultracold bosons in optical lattices in synthetic magnetic fields with wide range of in-cell fluxes α = p / q . The problem is similar to the one of an electron moving in a tight-binding scheme in the magnetic field and becomes difficult to tackle for a growing number… [Phys. Rev. A 93, 053607] Published Mon May 09, 2016

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Simulating frustrated magnetism with spinor Bose gases (2016)

T. Debelhoir and N. Dupuis

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2016-05-28

Beschreibung: Author(s): T. Debelhoir and N. Dupuis Although there is a broad consensus on the fact that critical behavior in stacked triangular Heisenberg antiferromagnets—an example of frustrated magnets with competing interactions—is described by a Landau-Ginzburg-Wilson Hamiltonian with O ( 3 ) × O ( 2 ) symmetry, the nature of the phase transition in th… [Phys. Rev. A 93, 051603(R)] Published Thu May 26, 2016

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