Regensburg 2007 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 29: Symposium THZ interactions

HL 29.3: Invited Talk

Wednesday, March 28, 2007, 15:15–15:45, H15

Interaction of THz Radiation with Semiconductor Nanostructures: Microscopic Theory — •Stephan Koch and Mackillo Kira — Fachbereich Physik, Philipps-Universität Marburg, Renthof 5, 35032 Marburg

In this talk we review our microscopic approach to treat the interaction of excited semiconductor nanostructures with THz radiation. We use a systematic expansion of the relevant many-body interaction contributions, showing that THz absorption must involve at least two- or more-particle correlations. This feature uniquely qualifies THz spectroscopy as a method to directly detect and identify many-body correlations in a system of incoherent quasi-particle excitations. Applications of the theory to analyze excitonic population generation [1,2], the dynamic build-up of plasmon excitations [3,4], excitonic population inversion and THz gain [5], as well as THz generation in two-color semiconductor lasers [6] will be discussed.

[1] R. A. Kaindl et al., Nature 423, 734 (2003) [2] M. Kira et al., Solid State. Com. 129, 733 (2004) [3] R. Huber et al., Nature 414, 286 (2001) [4] M. Kira and S.W. Koch, Prog. Quant. Electron. (2007) [5] M. Kira and S.W. Koch, Phys. Rev. Lett. 93, 076402 (2004) [6] S. Hoffmann et al., Appl. Phys. Lett. 84, 3585 (2004)