How does a dipolar Bose-Einstein condensate collapse?

Bohn, John L.; Wilson, Ryan; Ronen, Shai

doi:10.1134/s1054660x09040021

Cited by 26 publications

(51 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Note that for the parameters used in the experiment, the critical scattering length for pure contact interaction, given by (5.3) would be −0.3a 0 for λ = 1, which clearly shows that the instability is driven here by the dipole-dipole interaction. To calculate the exact stability threshold, one needs to resort to a numerical solution of the GPE (4.3); the result of such a calculation [99] is displayed as a thin line on figure 13 and shows a very good agreement with the data. The numerical solution reveals, for some values of the parameters (λ, a) close to the instability region, the appearance of 'biconcave' condensates, where the density has a local minimum in the center of the trap [100].…”

Section: Trapped Gas Geometrical Stabilizationmentioning

confidence: 96%

The physics of dipolar bosonic quantum gases

et al. 2009

View full text Add to dashboard Cite

Abstract. This article reviews the recent theoretical and experimental advances in the study of ultracold gases made of bosonic particles interacting via the longrange, anisotropic dipole-dipole interaction, in addition to the short-range and isotropic contact interaction usually at work in ultracold gases. The specific properties emerging from the dipolar interaction are emphasized, from the meanfield regime valid for dilute Bose-Einstein condensates, to the strongly correlated regimes reached for dipolar bosons in optical lattices.

show abstract

Section: Trapped Gas Geometrical Stabilizationmentioning

confidence: 96%

The physics of dipolar bosonic quantum gases

et al. 2009

View full text Add to dashboard Cite

show abstract

“…The results are summarized in the right panel of Fig. 6 as a thin line, while the thick line represents more accurate results calculated from solving numerically the GrossPitaevskii equation [29]. The dots with error bars correspond to experimental data [31].…”

Section: 22mentioning

confidence: 99%

“…, where a 0 is the s-wave scattering length, while the thick line is the numerical solution of the GP equation [29]. The dots with error bars are experimental data [31].…”

Section: 22mentioning

confidence: 99%

Ultracold dipolar gases in optical lattices

Trefzger¹,

Menotti²,

Capogrosso-Sansone³

et al. 2011

J. Phys. B: At. Mol. Opt. Phys.

167

155

View full text Add to dashboard Cite

Abstract. This tutorial is a theoretical work, in which we study the physics of ultra-cold dipolar bosonic gases in optical lattices. Such gases consist of bosonic atoms or molecules that interact via dipolar forces, and that are cooled below the quantum degeneracy temperature, typically in the nK range. When such a degenerate quantum gas is loaded into an optical lattice produced by standing waves of laser light, new kinds of physical phenomena occur. These systems realize then extended Hubbard-type models, and can be brought to a strongly correlated regime. The physical properties of such gases, dominated by the long-range, anisotropic dipole-dipole interactions, are discussed using the meanfield approximations, and exact Quantum Monte Carlo techniques (the Worm algorithm).

show abstract

“…An intuitive interpretation of the roton in an oblate trap was put forward by Bohn et al [128]. As the dipole strength is increased, it is energetically favourable for the dipoles to locally move out of the plane and align head-to-tail perpendicular to the plane, thereby taking advantage of this attractive configuration.…”

Section: Trapped Dipolar Condensatesmentioning

confidence: 99%

Vortices and vortex lattices in quantum ferrofluids

Martin

Marchant

O’Dell

et al. 2017

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

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.

show abstract

How does a dipolar Bose-Einstein condensate collapse?

Abstract: We emphasize that the macroscopic collapse of a dipolar Bose-Einstein condensate in a pancake-shaped trap occurs through local density fluctuations, rather than through a global collapse to the trap center. This hypothesis is supported by a recent experiment in a chromium condensate.

Cited by 26 publications

References 16 publications

The physics of dipolar bosonic quantum gases

The physics of dipolar bosonic quantum gases

Ultracold dipolar gases in optical lattices

Vortices and vortex lattices in quantum ferrofluids

Contact Info

Product

Resources

About