Spin-orbit anisotropy measured using ballistic spin resonance

Details Spin-orbit anisotropy measured using ballistic spin resonance Spin-orbit anisotropy measured using ballistic spin resonance

2010-09-28

arxiv.org/abs/1009.5702v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

Spin relaxation can be greatly enhanced in narrow channels of two-dimensional electron gas due to ballistic spin resonance, which is mediated by spin-orbit interaction for trajectories that bounce rapidly between channel walls. The channel orientation determines which momenta affect the relaxation process, so comparing relaxation for two orientations provides a direct determination of spin-orbit anisotropy. Electrical measurements of pure spin currents are shown to reveal an order of magnitude stronger relaxation for channels fabricated along the [110] crystal axis in a GaAs electron gas compared to [-110] channels, believed to result from interference between structural and bulk inversion asymmetries.

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