Tarasenko, Sergey and Ivchenko, Eougenious and Belkov, Vassilij and Ganichev, Sergey and Schowalter, Dieter and Schneider, Petra and Sollinger, M. and Prettl, Wilhelm and Ustinov, V. and Zhukov, A. and Vorobjev, L.
Optical spin orientation under inter- and intra-subband transitions in QWs.
Journal of Superconductivity 16 (2), pp. 419-422.
Other URL: http://www.physik.uni-regensburg.de/forschung/ganichev/reprints/Proceedings_PASP2002Monopol.pdf
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.