Fluctuation-Driven Vortex Fractionalization in Topologically Ordered Superfluids of Cold Atoms

Details Fluctuation-Driven Vortex Fractionalization in Topologically Ordered Superfluids of Cold Atoms Fluctuation-Driven Vortex Fractionalization in Topologically Ordered Superfluids of Cold Atoms

2008-06-13

arxiv.org/abs/0806.2323v2

Europhysics Letters 85, 20002 (2009).

Physics

Condensed Matter

Other Condensed Matter

5 pages, 2 figures; revised version accepted by Europhysics Letters

Scientific paper

10.1209/0295-5075/85/20002

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 pi-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.

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