Dresden 2011 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 85: Poster Session II

HL 85.1: Poster

Donnerstag, 17. März 2011, 18:00–21:00, P4

Quasiparticle wave functions in alloys — •Alexander Müller, Marko Stölzel, Gabriele Benndorf, and Marius Grundmann — Universität Leipzig, Institut für Exp. Physik II, Abteilung Halbleiterphysik, Linnéstr. 5, 04103 Leipzig

The effective mass approximation is a powerful tool to understand many effects in semiconductors such as the transport properties of electrons and holes, bound states at impurities as well as multi-particle complexes such as excitons. However, up to now this model has mainly been applied to elemental/compound semiconductors or virtual crystals. For alloys, there exist a number of methods to estimate the band gap or effective carrier masses such as the virtual crystal approximation or local density approximations on supercells. However, the applicability to very large cells to investigate localization effects is limited.

In this contribution we investigate the suitability of the effective mass approximation for alloys to include localization effects in this theory. Calculated envelopes of electron and hole wave functions are compared to wave functions determined using a 1D Kronig–Penney-like model. Indeed, we observe a good agreement between both models. The effective mass model is applied to excitons and the numerical accuracy of the found energy states is discussed.