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arXiv · 1408.5218

Pinning of Hidden Vortices in Bose-Einstein Condensate

T. Mithun·K. Porsezian·Bishwajyoti Dey
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Abstract

We study the vortex dynamics and vortex pinning effect in Bose-Einstein condensate in a rotating double-well trap potential and co-rotating optical lattice. We show that, in agreement with the experiment, the vortex number do not diverge when the rotational frequency $Ω\rightarrow 1$ if the trap potential is of anisotropic double-well type. The critical rotational frequency as obtained from numerical simulations agrees very well with the value $\sqrt l/l$ for $l=4$ which supports the conjecture that surface modes with angular momentum $l=4$ are excited when the rotating condensate is trapped in double-well potential. The vortex lattice structure in a rotating triple-well trap potential and its pinning shows very interesting features. We show the existence and pinning of a new type of hidden vortices whose phase profile is similar to that of the visible vortices.

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T. Mithun, K. Porsezian, Bishwajyoti Dey. 2014-08-22. Pinning of Hidden Vortices in Bose-Einstein Condensate. https://doi.org/10.1103/physreva.89.053625

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