Transition to quantum turbulence in a Bose-Einstein condensate through the bending-wave instability of a single-vortex ring

Horng, Tzyy-Leng; Hsueh, C.-H.; Gou, Shih-Chuan

doi:10.1103/physreva.77.063625

Cited by 30 publications

(19 citation statements)

References 19 publications

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“…Critical points far from equilibrium, the so-called non-thermal fixed points, were proposed [6] and related to strong wave turbulence [7][8][9][10] and the formation of quasitopological defects [15][16][17]. Such defects play an important role in superfluid turbulence, also referred to as quantum turbulence (QT), which has been the subject of extensive studies in the context of helium [22,23] and dilute Bose gases [24][25][26][27]. In contrast to eddies in classical fluids, vorticity in a superfluid is quantized [28,29] and the creation and annihilation processes of quantized vortices are distinctly different [22,23].…”

Section: Introductionmentioning

confidence: 99%

Non-thermal fixed points and solitons in a one-dimensional Bose gas

Schmidt¹,

Erne²,

Nowak³

et al. 2012

New J. Phys.

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Single-particle momentum spectra for a dynamically evolving onedimensional Bose gas are analysed in the semi-classical wave limit. Representing one of the simplest correlation functions, these provide information on a possible universal scaling behaviour. Motivated by the previously discovered connection between (quasi-) topological field configurations, strong wave turbulence and non-thermal fixed points of quantum field dynamics, soliton formation is studied with respect to the appearance of transient power-law spectra. A random-soliton model is developed for describing the spectra analytically, and the analogies and differences between the emerging power laws and those found in a field theory approach to strong wave turbulence are discussed. The results open a new perspective on solitary wave dynamics from the point of view of critical phenomena far from thermal equilibrium and the possibility of studying this dynamics by experiment without the need for detecting solitons in situ.

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Section: Introductionmentioning

confidence: 99%

Non-thermal fixed points and solitons in a one-dimensional Bose gas

Schmidt¹,

Erne²,

Nowak³

et al. 2012

New J. Phys.

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“…Although vortex dipoles are widespread in classical fluid flows [1], their role in superfluids seems less well established. Given the appearance of vortices and antivortices in the Berezinskii-Kosterlitz-Thouless transition [2][3][4] and superfluid turbulence [5][6][7], a detailed study of vortex dipoles will contribute to a broader understanding of superfluid phenomena.…”

Section: Introductionmentioning

confidence: 99%

Size and dynamics of vortex dipoles in dilute Bose-Einstein condensates

Kuopanportti

Huhtamäki²,

Möttönen³

2011

Phys. Rev. A

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Recently, Freilich et al. [Science 329, 1182 (2010)] experimentally discovered stationary states of vortex dipoles, pairs of vortices of opposite circulation, in dilute Bose-Einstein condensates. To explain their observations, we perform simulations based on the Gross-Pitaevskii equation and obtain excellent quantitative agreement on the size of the stationary dipole. We also investigate how their imaging method, in which atoms are repeatedly extracted from a single condensate, affects the vortex dynamics. We find that it mainly induces isotropic size oscillations of the condensate without otherwise disturbing the vortex trajectories. Thus, the imaging technique appears to be a promising tool for studying real-time superfluid dynamics.Comment: 4 pages, 3 figure

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“…In superfluids, the roles of quantized vortex dipoles appear less well established. Given the prevalence of vortices and antivortices in superfluid turbulence [4][5][6], the Berezinskii-Kosterlitz-Thouless (BKT) transition [7], and phase transition dynamics [8][9][10][11], a quantitative study of vortex dipoles will contribute to a broader and deeper understanding of superfluid phenomena. The realization of vortex dipoles in dilute Bose-Einstein condensates (BECs) is especially significant as BECs provide a clean testing ground for the microscopic physics of superfluid vortices [12][13][14].…”

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confidence: 99%

Observing the dance of a vortex−antivortex pair, step by step

Engels¹

2010

Physics

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We report experimental observations and numerical simulations of the formation, dynamics, and lifetimes of single and multiply charged quantized vortex dipoles in highly oblate dilute-gas Bose-Einstein condensates (BECs). We nucleate pairs of vortices of opposite charge (vortex dipoles) by forcing superfluid flow around a repulsive Gaussian obstacle within the BEC. By controlling the flow velocity we determine the critical velocity for the nucleation of a single vortex dipole, with excellent agreement between experimental and numerical results. We present measurements of vortex dipole dynamics, finding that the vortex cores of opposite charge can exist for many seconds and that annihilation is inhibited in our trap geometry. For sufficiently rapid flow velocities, clusters of like-charge vortices aggregate into longlived multiply charged dipolar flow structures.

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Transition to quantum turbulence in a Bose-Einstein condensate through the bending-wave instability of a single-vortex ring

Cited by 30 publications

References 19 publications

Non-thermal fixed points and solitons in a one-dimensional Bose gas

Non-thermal fixed points and solitons in a one-dimensional Bose gas

Size and dynamics of vortex dipoles in dilute Bose-Einstein condensates

Observing the dance of a vortex−antivortex pair, step by step

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