Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-05-16
New J. Phys. 10, 043030 (2008)
Physics
Condensed Matter
Strongly Correlated Electrons
6 pages, 2 figures
Scientific paper
10.1088/1367-2630/10/4/043030
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 is the ratio between the particle mass of the two species. In this paper, we characterize the vortex-locked state, establish its regime of stability, and find that it surives 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.
Barnett Ryan
Büchler Hans Peter
Porter Mason A.
Refael Gil
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