Dresden 2011 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 82: Ultrafast Phenomena

HL 82.10: Vortrag

Donnerstag, 17. März 2011, 17:00–17:15, POT 251

Intensity dependence of optically induced electron charge currents in quantum wells — •michał pochwała, huynh thanh duc, jens förstner, and torsten meier — Department of Physics and CeOPP, University of Paderborn, Warburger Str. 100, D-33098 Paderborn, Germany

We numerically investigate the intensity dependence of electron charge currents generated by perpendicular circularly polarized femtosecond laser pulse in (110)-grown semiconductor quantum wells GaAs/AlxGa1-xAs. Our analysis is based on a 14 band kp model [1] in combination with multisubband semiconductor Bloch equations [2-4]. The analysis shows that the generated electron charge currents depend on the intensity of the incident laser pulse in a highly nonlinear fashion. Oscillatory behavior of the electron charge current transients is predicted and explained.

[1] R. Winkler, Spin-Orbit Coupling Effects in Two Dimensional

Electron and Hole Systems (Springer, Berlin, 2003).

[2] B. Pasenow, H. T. Duc, T. Meier, and S. W. Koch, Solid State

Commun. 145, 61 (2008).

[3] H. T. Duc, J. Förstner, and T. Meier, Phys. Rev. B. 82, 115316

(2010).

[4] S. Priyadarshi, A. M. Racu, K. Pierz, U. Siegner, M. Bieler, H.

T. Duc, J. Förstner, and T. Meier, Phys. Rev. Lett. 104, 217401

(2010).