Pumping in a mesoscopic ring with Ahronov-Casher effect

Details Pumping in a mesoscopic ring with Ahronov-Casher effect Pumping in a mesoscopic ring with Ahronov-Casher effect

2006-06-06

arxiv.org/abs/cond-mat/0606136v1

Phys. Rev. B 73, 233304 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

PRB, to appear

Scientific paper

10.1103/PhysRevB.73.233304

We investigate parametric pumping of spin and charge currents in a mesoscopic ring interrupted by a tunnel barrier in presence of Aharonov-Casher (AC) effect and Aharonov-Bohm (AB) flux along the axis of the same ring. Generation of a dc current is achieved by tuning the tunnel barrier strength and modulating in time either a radial(transverse) electric field or the magnetic flux. A pure spin current is generated by the interplay of breaking spin reversal symmetry, due to AC effect, and time-reversal symmetry breaking, intrinsic in parametric pumping procedure. We analyze the conditions for operating the AB-AC ring as a pure spin pump useful in spintronics and discuss generalization of our results to Rashba-gate-controlled rings.

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