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Abstract: Recently, Freilich et al. Science 329, 1182 2010 experimentallydiscovered stationary states of vortex dipoles, pairs of vortices of oppositecirculation, in dilute Bose-Einstein condensates. To explain theirobservations, we perform simulations based on the Gross-Pitaevskii equation andobtain excellent quantitative agreement on the size of the stationary dipole.We also investigate how their imaging method, in which atoms are repeatedlyextracted from a single condensate, affects the vortex dynamics. We find thatit mainly induces isotropic size oscillations of the condensate withoutotherwise disturbing the vortex trajectories. Thus, the imaging techniqueappears to be a promising tool for studying real-time superfluid dynamics.



Autor: Pekko Kuopanportti, Jukka A. M. Huhtamäki, Mikko Möttönen

Fuente: https://arxiv.org/



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