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HL: Fachverband Halbleiterphysik

HL 5: Ultra-fast Phenomena

HL 5.6: Vortrag

Montag, 22. März 2010, 11:45–12:00, H17

Experimental and theoretical investigations of photocurrents in non-centrosymmetric semiconductor quantum wells — •Huynh Thanh Duc¹, Jens Förstner¹, Torsten Meier¹, Shekar Priyadarshi², Ana Maria Racu², Klaus Pierz², Uwe Siegner², and Mark Bieler² — ¹Department of Physics and CeOPP, Univer- sity Paderborn, Warburger Str. 100, D-33098 Paderborn, Germany — ²Physikalisch-Technische Bundesanstalt, Bundesallee 100, D-38116 Braunschweig, Germany

We compute photocurrents generated by femtosecond single-color laser pulses in non-centrosymmetric semiconductor quantum wells by combining a 14x14 k.p band structure theory with multi-band semiconductor Bloch equations [1]. The transient photocurrents are investigated experimentally by measuring the associated Terahertz emission [2]. The dependencies of the photocurrent and the Terahertz emission on the excitation conditions are discussed for (110)-oriented GaAs quantum wells. The comparison between theory and experiment shows a good agreement.

[1] M. Bieler, K. Pierz, U. Siegner, P. Dawson, H. T. Duc, J. Förstner, and T. Meier, Proc. SPIE, 7214, 721404 (2009).

[2] M. Bieler, K. Pierz, and U. Siegner, J. Appl. Phys. 100, 083710 (2006).