Regensburg 2010 – wissenschaftliches Programm
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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).