Dresden 2011 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 89: Optical Properties II

HL 89.10: Talk

Friday, March 18, 2011, 12:45–13:00, POT 251

Excitonic Absorption Spectra with Energetic Disorder — •Dirk Heinze, Jens Förstner, Matthias Reichelt, and Torsten Meier — Department of Physics and CeOPP, University of Paderborn, Warburger Str. 100, 33098 Paderborn

Using a time-domain real-space tight-binding approach[1], we calculate linear absorption spectra for a semiconductor quantum wire model system in the presence of energetic disorder. To model the energetic disorder a Gaussian distribution of random numbers is taken to represent a spatial disorder potential. The influence of the strength and spatial correlation of the energetic disorder is analysed. Extending previous studies, e. g. [2], a smooth spectrum is achieved by self-averaging over a sufficiently large system.

[1]T. Meier, P. Thomas, and S. W. Koch. Coherent Semiconductor Optics - From Basic Concepts to Nanostructure Applications. Springer, 2007

[2]I. Kuznetsova et al., Modeling excitonic line shapes in weakly disordered semiconductor nano-structures.. Phys. Rev. B 81, 075307 (2010)