Gate-controlled spin-orbit interaction in a parabolic GaAs/AlGaAs quantum well

Details Gate-controlled spin-orbit interaction in a parabolic GaAs/AlGaAs quantum well Gate-controlled spin-orbit interaction in a parabolic GaAs/AlGaAs quantum well

2009-03-05

arxiv.org/abs/0903.0920v2

Physical Review Letters, APS, 2009, 103, 027201

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.103.027201

We study the tunability of the spin-orbit interaction in a two-dimensional electron gas with a front and a back gate electrode by monitoring the spin precession frequency of drifting electrons using time-resolved Kerr rotation. The Rashba spin splitting can be tuned by the gate biases, while we find a small Dresselhaus splitting that depends only weakly on the gating. We determine the absolute values and signs of the two components and show that for zero Rashba spin splitting the anisotropy of the spin-dephasing rate vanishes.

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