Relaxation of superfluid turbulence in highly oblate Bose-Einstein condensates

Kwon, Woo Jin; Moon, Geol; Choi, Jae-yoon; Seo, Sang Won; Shin, Yeong Gil

doi:10.1103/physreva.90.063627

Cited by 145 publications

(192 citation statements)

References 36 publications

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“…This procedure corresponds to the well-established technique of imprinting vortices by 'stirring' a Bose-Einstein condensed dilute atomic gas with the help of a laser [45,46]. Experimental methods have been refined for creating vortices in cold atomic gases [5,6,47,48] and exciton-polariton superfluids [8,9].…”

Section: Initial Conditionsmentioning

confidence: 99%

Non-thermal fixed point in a holographic superfluid

Ewerz

Gasenzer

Karl

et al. 2015

J. High Energ. Phys.

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Abstract:We study the far-from-equilibrium dynamics of a (2 + 1)-dimensional superfluid at finite temperature and chemical potential using its holographic description in terms of a gravitational system in 3 + 1 dimensions. Starting from various initial conditions corresponding to ensembles of vortex defects we numerically evolve the system to long times. At intermediate times the system exhibits Kolmogorov scaling the emergence of which depends on the choice of initial conditions. We further observe a universal latetime regime in which the occupation spectrum and different length scales of the superfluid exhibit scaling behaviour. We study these scaling laws in view of superfluid turbulence and interpret the universal late-time regime as a non-thermal fixed point of the dynamical evolution. In the holographic superfluid the non-thermal fixed point can be understood as a stationary point of the classical equations of motion of the dual gravitational description.

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Section: Initial Conditionsmentioning

confidence: 99%

Non-thermal fixed point in a holographic superfluid

Ewerz

Gasenzer

Karl

et al. 2015

J. High Energ. Phys.

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“…3(a), where N d is measured as a function of v for fixed sweep lengths L = vt of the laser beam. This is a typical situation addressed in previous experiments to measure the critical velocity v c for vortex shedding [10,11,16] Fig. 3(b)].…”

Section: Periodic Vortex Shedding a Penetrable Obstaclementioning

confidence: 99%

“…Quantized vortex dipoles were created in BECs by moving optical obstacles [9][10][11] and via quenching dynamics [12,13], and also observed in quasi-2D degenerate Bose gases [14]. Orbital motions of a single vortex dipole in a trapped BEC were investigated [10,13,15] and annihilation of vortex dipoles was indirectly probed in relaxation of superfluid turbulence in highly oblate BECs [16].…”

Section: Introductionmentioning

confidence: 99%

Periodic shedding of vortex dipoles from a moving penetrable obstacle in a Bose-Einstein condensate

2015

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We investigate vortex shedding from a moving penetrable obstacle in a highly oblate Bose-Einstein condensate. The penetrable obstacle is formed by a repulsive Gaussian laser beam that has the potential barrier height lower than the chemical potential of the condensate. The moving obstacle periodically generates vortex dipoles and the vortex shedding frequency fv linearly increases with the obstacle velocity v as fv = a(v − vc), where vc is a critical velocity. Based on periodic shedding behavior, we demonstrate deterministic generation of a single vortex dipole by applying a short linear sweep of a laser beam. This method will allow further controlled vortex experiments such as dipole-dipole collisions.

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“…Kwon et al also studied 2D QT [120]. This experiment used 23 Na, generating more than 50 quantized vortices.…”

Section: D Qt In Single-component Becsmentioning

confidence: 99%

Numerical Studies of Quantum Turbulence

2017

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We review numerical studies of quantum turbulence. Quantum turbulence is currently one of the most important problems in low temperature physics and is actively studied for superfluid helium and atomic Bose-Einstein condensates. A key aspect of quantum turbulence is the dynamics of condensates and quantized vortices. The dynamics of quantized vortices in superfluid helium are described by the vortex filament model, while the dynamics of condensates are described by the Gross-Pitaevskii model. Both of these models are nonlinear, and the quantum turbulent states of interest are far from equilibrium. Hence, numerical studies have been indispensable for studying quantum turbulence. In fact, numerical studies have contributed in revealing the various problems of quantum turbulence. This article reviews the recent developments in numerical studies of quantum turbulence. We start with the motivation and the basics of quantum turbulence and invite readers to the frontier of this research. Though there are many important topics in the quantum turbulence of superfluid helium, this article focuses on inhomogeneous quantum turbulence in a channel, which has been motivated by recent visualization experiments. Atomic Bose-Einstein condensates are a modern issue in quantum turbulence, and this article reviews a variety of topics in the quantum turbulence of condensates e.g. two-dimensional quantum turbulence, weak wave turbulence, turbulence in a spinor condensate, etc., some of which has not been addressed in superfluid helium and paves the novel way for quantum turbulence researches. Finally we discuss open problems.

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Relaxation of superfluid turbulence in highly oblate Bose-Einstein condensates

Cited by 145 publications

References 36 publications

Non-thermal fixed point in a holographic superfluid

Non-thermal fixed point in a holographic superfluid

Periodic shedding of vortex dipoles from a moving penetrable obstacle in a Bose-Einstein condensate

Numerical Studies of Quantum Turbulence

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