Dresden 2006 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 9: Poster I

HL 9.36: Poster

Montag, 27. März 2006, 15:15–17:45, P3

Pseudopotential investigations of electronic and optical properties of wurtzite ZnO and GaN — •Daniel Fritsch, Heidemarie Schmidt, and Marius Grundmann — Universität Leipzig, Fakultät für Physik und Geowissenschaften

We have investigated the electronic properties of two important UV materials by means of the empirical pseudopotential method (EPM) including spin-orbit coupling. The transferable model potential parameters of the ionic model potential used in this work were fitted to experimentally well-known low-temperature transition energies of wurtzite ZnO and GaN to obtain a reliable description of the band dispersion throughout the Brillouin zone.

We determined the transition matrix elements in the electric dipole approximation at special points in the Brillouin zone following the scheme proposed by Chadi and Cohen [1]. A summation of these matrix elements yields the dielectric function and can be related to experimental data obtained by spectroscopic ellipsometry [2].

[1] D. J. Chadi and M. L. Cohen, Phys. Rev. B 8, 5747 (1973).

[2] D. Fritsch et al., Proceedings of NUSOD ’05, 69 (2005).