Abstract
It is shown that absorption of circularly polarized infrared radiation achieved by inter-subband and intra-subband (Drude-like) transitions results in a monopolar spin orientation of free carriers. The monopolar spin polarization in zinc-blende-based quantum wells (QWs) is demonstrated by the observation of the spin-galvanic and circular photogalvanic effects. It is shown that monopolar spin orientation in n-type QWs becomes possible if an admixture of valence band states to the conduction band wave function and the spin–orbit splitting of the valence band are taken into account.
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Tarasenko, S.A., Ivchenko, E.L., Bel'kov, V.V. et al. Optical Spin Orientation Under Inter- and Intra-Subband Transitions in QWs. Journal of Superconductivity 16, 419–422 (2003). https://doi.org/10.1023/A:1023614814593
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DOI: https://doi.org/10.1023/A:1023614814593