Ganichev, Sergey and Rössler, Ulrich and Prettl, Wilhelm and Ivchenko, E. and Belkov, Vassilij and Neumann, Richard and Brunner, K. and Abstreiter, Gerhard (2002) Removal of spin-degenerancy in p-SiGe quantum wells demonstrated by spin-photocurrents. Physical Review B 66 (7), p. 75328.
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Other URL: http://link.aps.org/abstract/PRB/v66/e075328
Spin photocurrents requiring a system lacking inversion symmetry, become possible in SiGe based quantum well (QW) structures due to their built-in asymmetry. We report on circular and linear photogalvanic effects induced by infrared radiation in (001)- and (113)-oriented p-Si/Si1–xGex QW structures and analyze the observations in view of the possible symmetry of these structures. The circular photogalvanic effect arises due to optical spin orientation of free carriers in QW's with spin-split subbands. It results in a directed motion of free carriers in the plane of the QW. We discuss possible microscopic mechanisms that could remove the spin degeneracy of the electronic subband states.
|Institutions:|| Physics > Institute of Experimental and Applied Physics > Retired Professors > Group Wilhelm Prettl|
Physics > Institute of Experimental and Applied Physics > Professor Ganichev > Group Sergey Ganichev
Physics > Institute of Theroretical Physics > Retired Professors > Group Ulrich Rössler
|Projects:||Forschergruppe Ferromagnet-Halbleiter Nanostrukturen|
|Subjects:||500 Science > 530 Physics|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||20 Mar 2007|
|Last Modified:||20 Jul 2011 20:55|