Belkov, Vassilij and Ganichev, Sergey and Schneider, Petra and Schowalter, D. and Rössler, Ulrich and Prettl, Wilhelm and Ivchenko, E. and Neumann, Richard and Brunner, K. and Abstreiter, Gerhard (2003) Spin-Photocurrent in p-SiGe quantum wells under terahertz laser irradiation. Journal of Superconductivity 16 (2), pp. 415-418.
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A detailed study of the circular photogalvanic effect (CPGE) in SiGe structures is presented. It is shown that the CPGE becomes possible because of the built-in asymmetry of quantum wells (QWs) in compositionally stepped samples and in asymmetrically doped structures. The photocurrent arises due to optical spin orientation of free carriers in QWs with spin splitting in k-space. It is shown that the effect can be applied to probe the macroscopic in-plane symmetry of low dimensional structures and allowing to conclude on Rashba or Dresselhaus terms in the Hamiltonian.
|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|
|Keywords:||SiGe-QWs; photogalvanic effect; Rashba term.|
|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|