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Oscillation of the spin-currents of cold atoms on a ring due to light-induced spin-orbit coupling

The evolution of two-component cold atoms on a ring with spin-orbit coupling has been studied analytically for the case with N noninteracting particles. Then, the effect of interaction is evaluated numerically via a two-body system. Two cases are considered: (i) Starting from a ground state the evolution is induced by a sudden change of the laser field, and (ii) Starting from a superposition state. Oscillating persistent spin-currents have been found. A set of formulae have been derived to describe the period and amplitude of the oscillation. Based on these formulae the oscillation can be well controlled via adjusting the parameters of the laser beams. In particular, it is predicted that movable stripes might emerge on the ring.

preprint2015arXivOpen access
W. F. XieY. Z. HeC. G. Bao
physics.atom-phcond-mat.quant-gasquant-ph
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W. F. XieY. Z. HeC. G. Bao

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