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Removal of spin degeneracy in SiGe-based nanostructures

Ganichev, Sergey ; Rössler, Ulrich ; Prettl, Wilhelm ; Ivchenko, Eougenious ; Belkov, Vassilij ; Neumann, Richard ; Brunner, K. ; Abstreiter, Gerhard



Abstract

The photogalvanic effects, which require a system lacking inversion symmetry, become possible in SiGe based quantum well (QW) structures due to their built-in asymmetry. We report on the removal of spin degeneracy in the k-space of SiGe nanostructures. This is concluded from the observations of the circular photogalvanic effect induced by infrared radiation in asymmetric p-type QWs. We discuss possible mechanisms that give rise to spin-splitting of the electronic subband states.


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