Tuning the Spin Hall Effect in a Two-Dimensional Electron Gas

Details Tuning the Spin Hall Effect in a Two-Dimensional Electron Gas Tuning the Spin Hall Effect in a Two-Dimensional Electron Gas

2009-05-08

arxiv.org/abs/0905.1269v1

Europhysics Letters 87, 37008 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1209/0295-5075/87/37008

We provide a theoretical framework for the electric field control of the electron spin in systems with diffusive electron motion. The approach is valid in the experimentally important case where both intrinsic and extrinsic spin-orbit interaction in a two-dimensional electron gas are present simultaneously. Surprisingly, even when the extrinsic mechanism is the dominant driving force for spin Hall currents, the amplitude of the spin Hall conductivity may be considerably tuned by varying the intrinsic spin-orbit coupling via a gate voltage. Furthermore we provide an explanation of the experimentally observed out-of-plane spin polarization in a (110) GaAs quantum well.

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