Non-Equilibrium Spin Accumulation due to the Spin Hall Effect in Mesoscopic Two-Probe Ballistic Spin-Orbit Coupled Semiconductor Structures

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  • 22 December 2004
Abstract
We study nonequilibrium spin accumulation induced by the flow of unpolarized current through a ballistic finite-size two-dimensional electron gas with Rashba spin-orbit coupling and demonstrate it to be the principal observable signature of spin Hall effect in mesoscopic structures attached to two leads. The out-of-plane component of the spin accumulation has opposite sign on the two lateral edges, and vanishes inside the sample for the nonlinear quantum transport regime or exhibits oscillations within the sample for the linear regime. While static disorder gradually diminishes the amplitude of the edge accumulation peaks, external in-plane transverse magnetic field can enhance them thereby providing an experimentally distinguishable feature of the mesoscopic spin Hall effect.

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