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

Abstract

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

Guiding-center dynamics of vortex dipoles in Bose-Einstein condensates

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Exploring rigidly rotating vortex configurations and their bifurcations in atomic Bose-Einstein condensates

“…[17]. While such few-vortex clusters were created early on in the experimental history of atomic BECs [18], and were intensely studied theoretically [19][20][21][22][23][24][25][26][27][28], these recent works have shed new light onto relevant static and dynamic possibilities that has in turn motivated further theoretical analysis [29][30][31][32].…”

Few-particle vortex cluster equilibria in Bose–Einstein condensates: existence and stability

“…A very recent work has also produced sets of 2-, 3-, 4-vortices exploring their dynamics in the absence of a rotational angular momentum induced term [21]. These experimental works have, in turn, either had as a preamble [22,23,24,25,26,27,28,29,30] or subsequently motivated [31,32,33,34,35] studies on the statics, stability and dynamics of such vortex clusters (predominantly, in fact, the vortex dipole).…”