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Imaging of spin textures in two-dimensional electron gases: dynamical formation and active manipulation of the persistent spin helix

Time-resolved magneto-optical Kerr microscopy measures the spatio-temporal evolution of electron spin textures in modulation-doped GaAs and CdTe quantum wells. The structures feature similar Dresselhaus and Rashba coefficients, such that there is negligible impact of spin-orbit coupling for electrons moving along the [110] or [110] directions. In contrast, strong spin-orbit coupling emerges for electrons moving perpendicular to those crystallographic directions. As a result, we observe a helical spin pattern often refered to as persistent spin helix. After analyzing the purely diffusive electron motion after ultrafast optical spin injection we move on to study the impact of in-plane electric fields, magnetic fields and the combination of both.