Publication: On the temperature dependence of the optical response: Application to bulk GaAs

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Title	On the temperature dependence of the optical response: Application to bulk GaAs
Authors/Editors*	Z.A. Ibrahim, A.I. Shkrebtii, M.J.G. Lee, K. Vynck, T. Teatro, W. Richter, T. Trepk, and T. Zettler
Where published*	Phys. Rev. Lett. submitted
How published*	Other
Year*	2007
Volume
Number
Pages
Publisher
Keywords	molecular dynamics,optical response of semiconductors, bulk GaAs
Link	arXiv:0710.1020v1 [cond-mat.mtrl-sci]
Abstract	We present a novel approach that takes into account lattice dynamical effects in calculating the optical response of semiconductors by averaging over several thermally perturbed configurations extracted from molecular dynamic simulations. The validity of the approach is confirmed by comparing our results in the range 0 to 700 K with our highly accurate ellipsometry measurements of the dielectric function of bulk GaAs. Our approach resolves the long-standing discrepancy in energy and line shape between experiment and the latest optical models that all neglect lattice dynamics.