Volume 85, Number 2, January 2009
|Number of page(s)||5|
|Published online||30 January 2009|
Spin structure and critical nucleation frequency of fractionalized vortices in 2D topologically ordered superfluids of cold atoms
Department of Physics and Astronomy, The University of British Columbia - Vancouver, B. C., V6T1Z1 Canada
Corresponding author: firstname.lastname@example.org
Accepted: 15 December 2008
We have studied spin structures of fluctuation-driven fractionalized vortices and topological spin order in 2D nematic superfluids of cold sodium atoms. Our Monte Carlo simulations suggest a softened-spin disclination structure in a half-quantum vortex when spin correlations are short ranged; in addition, calculations indicate that a unique non-local topological spin order emerges simultaneously as cold atoms become a superfluid below a critical temperature. We have also estimated fluctuation-dependent critical frequencies for half-quantum vortex nucleation in rotating optical traps and discussed probing these excitations in experiments.
PACS: 03.75.Lm – Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations / 03.75.Mn – Multicomponent condensates; spinor condensates / 03.75.Nt – Other Bose-Einstein condensation phenomena
© EPLA, 2009
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