Directional dependence of spin currents induced by Aharonov-Casher phase

Details Directional dependence of spin currents induced by Aharonov-Casher phase Directional dependence of spin currents induced by Aharonov-Casher phase

1998-02-03

arxiv.org/abs/cond-mat/9802037v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

16pages, 5 postscript figures. Submitted to Phys. Rev. B

Scientific paper

10.1142/S021797929800123X

We have calculated the persistent spin current of an open ring induced by the Aharonov-Casher phase. For unpolarized electrons there exist no persistent charge currents, but persistent spin currents. We show that, in general, the magnitude of the persistent spin current in a ring depends on the direction of the direct current flow from one reservoir to another. The persistent spin current is modulated by the cosine function of the spin precession angle. The nonadiabatic Aharonov-Casher phase gives anomalous behaviors. The Aharonov-Anandan phase is determined by the solid angle of spin precession. When the nonadiabatic Aharonov-Anandan phase approaches a constant value with the increase of the electric field, the periodic behavior of the spin persistent current occurs in an adiabatic limit. In this limit the periodic behavior of the persistent spin current could be understood by the effective spin-dependent Aharonov-Bohm flux.

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