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Scattering Induced Spin Separation at Zero Bias

Ganichev, Sergey ; Belkov, Vassilij ; Tarasenko, Sergey ; Danilov, Sergey ; Giglberger, Stephan ; Hoffmann, Christoph ; Ivchenko, Eougenious ; Weiss, Dieter ; Gerl, Christian ; Schuh, Dieter ; Wegscheider, Werner ; Prettl, Wilhelm


We show that in gyrotropic semiconductor structures spin-dependent asymmetry of electron scattering induces a spin separation which, in contrast to the spin Hall effect, does not require an electric current to flow. The effect is observed in GaAs/AlGaAs quantum well structures at free-carrier absorption of terahertz (THz) radiation. Microscopic theory based on asymmetry of photoexcitation and relaxation is developed being in a good agreement with experiment.

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