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Vortex lattice locking in rotating two-component Bose–Einstein condensates

Barnett, Ryan and Refael, Gil and Porter, Mason A. and Büchler, Hans Peter (2008) Vortex lattice locking in rotating two-component Bose–Einstein condensates. New Journal of Physics, 10 (4). 043030. ISSN 1367-2630. doi:10.1088/1367-2630/10/4/043030.

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The vortex density of a rotating superfluid, divided by its particle mass, dictates the superfluid's angular velocity through the Feynman relation. To find how the Feynman relation applies to superfluid mixtures, we investigate a rotating two-component Bose–Einstein condensate, composed of bosons with different masses. We find that in the case of sufficiently strong interspecies attraction, the vortex lattices of the two condensates lock and rotate at the drive frequency, while the superfluids themselves rotate at two different velocities, whose ratio equals the ratio between the particle masses of the two species. In this paper, we characterize the vortex-locked state, establish its regime of stability, and find that it survives within a disk smaller than a critical radius, beyond which vortices become unbound and the two Bose-gas rings rotate together at the frequency of the external drive.

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Additional Information:Copyright © 2008 Deutsche Physikalische Gesellschaft & Institute of Physics. Received 24 January 2008. Published 15 April 2008. We are grateful for the hospitality of the Kavli Institute for Theoretical Physics where part of this work was completed. We acknowledge support from the Sherman Fairchild Foundation (RB), the Gordon and Betty Moore Foundation through Caltech’s Center for the Physics of Information (MAP), and the National Science Foundation under grant no. PHY05-51164 (RB, GR and HPB). We also acknowledge useful discussions with Simon Cornish, Michael Cross, Peter Engels and Erich Mueller.
Issue or Number:4
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ID Code:10252
Deposited By: Archive Administrator
Deposited On:18 Apr 2008
Last Modified:12 Jul 2022 19:41

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