Dresden 2009 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 7: Nanophotonics - Theory of Nanophotonic Devices III

DS 7.2: Topical Talk

Montag, 23. März 2009, 16:00–16:30, GER 38

Photo- and spin current generation and dynamics in semiconductor nanostructures — Huynh Thanh Duc, Jens Förstner, and •Torsten Meier — Deparment Physik, Fakultät für Naturwissenschaften, Universität Paderborn, Warburger Str. 100, D-33098 Paderborn

The band structure and wave functions of GaAs quantum wells are computed via k.p band structure theory including anisotropy and spin splitting. Using these results, the process of generating photocurrents by optical excitation is analyzed. Depending on the symmetry of the material, the direction of the laser beam, and the polarization direction of the light field/s, one can coherently generate charge and/or spin photocurrents on ultrashort time scales. The direction, the strength, and the dynamics of these photocurrents are computed and discussed.