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Electron spin transport and dynamics are investigated in a single,high-mobility, modulation-doped, GaAs quantum well using ultrafast two-colorKerr-rotation micro-spectroscopy, supported by qualitative kinetic theorysimulations of spin diffusion and transport. Evolution of the spins is governedby the Dresselhaus bulk and Rashba structural inversion asymmetries, whichmanifest as an effective magnetic field that can be extracted directly from theexperimental coherent spin precession. A spin precession length L-SOI isdefined as one complete precession in the effective magnetic field. It isobserved that application of (a) an out-of-plane electric field changes thespin decay time and L-SOI through the Rashba component of the spin-orbitcoupling, (b) an in-plane magnetic field allows for extraction of theDresselhaus and Rashba parameters, and (c) an in-plane electric field markedlymodifies both the L-SOI and diffusion coefficient. While simulations reproducethe main features of the experiments, the latter results exceed thecorresponding simulations and extend previous studies ofdrift-current-dependent spin-orbit interactions.

Gate-Control of Anisotropic Spin Transport and Spin Helix Dynamics in a Modulation-Doped GaAs Quantum Well