title: Spin Hall current driven by quantum interferences in mesoscopic Rashba rings.
abstract: We propose an all-electrical nanostructure where pure spin current is induced in the transverse voltage probes attached to a quantum-coherent ballistic one-dimensional ring when unpolarized charge current is injected through its longitudinal leads. Tuning of the Rashba spin-orbit coupling in a semiconductor heterostructure hosting the ring generates quasiperiodic oscillations of the predicted spin-Hall current due to spin-sensitive quantum-interference effects caused by the difference in the Aharonov-Casher phase accumulated by opposite spin states. Its amplitude is comparable to that of the spin-Hall current predicted for finite-size (simply connected) two-dimensional electron gases, while it gets reduced gradually in wide two-dimensional rings or due to spin-independent disorder.
authors.affiliation: Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716-2570, USA.
authors.forename: Satofumi
authors.initials: S
authors.lastname: Souma
authors.forename: Branislav K
authors.initials: BK
authors.lastname: Nikolić