Thursday, October 18, 2012

1210.4834 (Scott Beattie et al.)

Persistent currents in spinor condensates    [PDF]

Scott Beattie, Stuart Moulder, Richard J. Fletcher, Zoran Hadzibabic
We create and study persistent currents in a toroidal two-component Bose gas, consisting of $^{87}$Rb atoms in two different spin states. For a large spin-population imbalance we observe supercurrents persisting for over two minutes. However we find that the supercurrent is unstable for spin polarisation below a well defined critical value. We also investigate the role of phase coherence between the two spin components and show that only the magnitude of the spin-polarisation vector, rather than its orientation in spin space, is relevant for supercurrent stability.
View original: http://arxiv.org/abs/1210.4834

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