Spin Hall Current Driven by Quantum Interferences in Mesoscopic Rashba Rings

Details Spin Hall Current Driven by Quantum Interferences in Mesoscopic Rashba Rings Spin Hall Current Driven by Quantum Interferences in Mesoscopic Rashba Rings

2004-10-27

arxiv.org/abs/cond-mat/0410716v1

Phys. Rev. Lett. 94, 106602 (2005).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 color figures

Scientific paper

10.1103/PhysRevLett.94.106602

We propose an all-electrical nanoscopic structure where {\em pure} spin current is induced in the transverse voltage probes attached to {\em quantum-coherent} one-dimensional ring when conventional unpolarized charge current is injected through its longitudinal leads. Tuning of the Rashba spin-orbit coupling in semiconductor heterostructure hosting the ring generates quasi-periodic oscillations of the predicted spin Hall current due to {\em spin-sensitive quantum-interference effects} caused by the difference in Aharonov-Casher phase acquired by opposite spins states traveling clockwise and counterclockwise. Its amplitude is comparable to the mesoscopic spin Hall current predicted for finite-size two-dimensional electron gases, while it gets reduced in wide two-dimensional or disordered rings.

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