Emergence of coherence via transverse condensation in a uniform quasi-two-dimensional Bose gas

Chomaz, Lauriane; Corman, Laura; Bienaimé, Tom; Desbuquois, Rémi; Weitenberg, Christof; Nascimbène, Sylvain; Beugnon, Jérôme; Dalibard, Jean

doi:10.1038/ncomms7162

Cited by 265 publications

(276 citation statements)

References 56 publications

(93 reference statements)

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“…More generally, when van der Waals interactions are included [123,124], both biconcave and dumbbell shapes can arise [125]. Under box-like potentials, which have been realized in recent years [126,127], density oscillations associated with the roton can arise at the condensate edge [79].…”

Section: Trapped Dipolar Condensatesmentioning

confidence: 99%

Vortices and vortex lattices in quantum ferrofluids

Martin

Marchant

O’Dell

et al. 2017

J. Phys.: Condens. Matter

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The experimental realization of quantum-degenerate Bose gases made of atoms with sizeable magnetic dipole moments has created a new type of fluid, known as a quantum ferrofluid, which combines the extraordinary properties of superfluidity and ferrofluidity. A hallmark of superfluids is that they are constrained to rotate through vortices with quantized circulation. In quantum ferrofluids the long-range dipolar interactions add new ingredients by inducing magnetostriction and instabilities, and also affect the structural properties of vortices and vortex lattices. Here we give a review of the theory of vortices in dipolar Bose-Einstein condensates, exploring the interplay of magnetism with vorticity and contrasting this with the established behaviour in non-dipolar condensates. We cover single vortex solutions, including structure, energy and stability, vortex pairs, including interactions and dynamics, and also vortex lattices. Our discussion is founded on the mean-field theory provided by the dipolar Gross-Pitaevskii equation, ranging from analytic treatments based on the Thomas-Fermi (hydrodynamic) and variational approaches to full numerical simulations. Routes for generating vortices in dipolar condensates are discussed, with particular attention paid to rotating condensates, where surface instabilities drive the nucleation of vortices, and lead to the emergence of rich and varied vortex lattice structures. We also present an outlook, including potential extensions to degenerate Fermi gases, quantum Hall physics, toroidal systems and the Berezinskii-Kosterlitz-Thouless transition.

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Section: Trapped Dipolar Condensatesmentioning

confidence: 99%

Vortices and vortex lattices in quantum ferrofluids

Martin

Marchant

O’Dell

et al. 2017

J. Phys.: Condens. Matter

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“…As a result, finite-sized phase domains are formed, which display independent choices of the symmetry breaking order parameter. The KZ physics have been intensively studied experimentally in a wide range of systems including experiments in atomic Bose-Einstein condensates [1][2][3][4][5][6][7][8][9], which indeed provide the ability of adapting and tuning the system parameters with an exceptional level of control.…”

Section: Introductionmentioning

confidence: 99%

Nonadiabatic quantum phase transition in a trapped spinor condensate

2016

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We study the effect of an external harmonic trapping potential on an outcome of the nonadiabatic quantum phase transition from an antiferromagnetic to a phase-separated state in a spin-1 atomic condensate. Previously, we demonstrated that the dynamics of an untrapped system exhibits double universality with two different scaling laws appearing due to the conservation of magnetization. We show that in the presence of a trap, double universality persists. However, the corresponding scaling exponents are strongly modified by the transfer of local magnetization across the system. The values of these exponents cannot be explained by the effect of causality alone, as in the spinless case. We derive the appropriate scaling laws based on a slow diffusive-drift relaxation process in the local density approximation.

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“…This is most severe for supersolid states, such as the elusive FFLO state [21][22][23], where the emergent spatial period is well defined only in a homogeneous setting. A natural solution to these problems is the use of uniform potentials, which have recently proved to be advantageous for thermodynamic and coherence measurements with Bose gases [24][25][26][27].…”

mentioning

confidence: 99%

Homogeneous Atomic Fermi Gases

et al. 2017

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We report on the creation of homogeneous Fermi gases of ultracold atoms in a uniform potential. In the momentum distribution of a spin-polarized gas, we observe the emergence of the Fermi surface and the saturated occupation of one particle per momentum state: the striking consequence of Pauli blocking in momentum space for a degenerate gas. Cooling a spin-balanced Fermi gas at unitarity, we create homogeneous superfluids and observe spatially uniform pair condensates. For thermodynamic measurements, we introduce a hybrid potential that is harmonic in one dimension and uniform in the other two. The spatially resolved compressibility reveals the superfluid transition in a spin-balanced Fermi gas, saturation in a fully polarized Fermi gas, and strong attraction in the polaronic regime of a partially polarized Fermi gas.

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Emergence of coherence via transverse condensation in a uniform quasi-two-dimensional Bose gas

Cited by 265 publications

References 56 publications

Vortices and vortex lattices in quantum ferrofluids

Vortices and vortex lattices in quantum ferrofluids

Nonadiabatic quantum phase transition in a trapped spinor condensate

Homogeneous Atomic Fermi Gases

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