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Coherent potential approximation for spatially correlated disorder

Authors
  • Zimmermann, Roland
  • Schindler, Christoph
Type
Published Article
Publication Date
Oct 15, 2009
Submission Date
Apr 25, 2009
Identifiers
DOI: 10.1103/PhysRevB.80.144202
Source
arXiv
License
Yellow
External links

Abstract

The coherent potential approximation (CPA) is extended to describe satisfactorily the motion of particles in a random potential which is spatially correlated and smoothly varying. In contrast to existing cluster-CPA methods, the present scheme preserves the simplicity of the conventional CPA in using a single self-energy function. Its accuracy is checked by a comparison with the exact moments of the Green's function, and with the spectral function from numerical simulations. The scheme is applied to excitonic absorption spectra in different spatial dimensions.

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