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Study of the electronic local density of states using the cluster-Bethe-lattice method: Application to amorphous III-V semiconductors

Felix Yndurain*

J. D. Joannopoulos

  • Department of Physics, University of California, Berkeley, California 94720

  • Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

  • *Work supported by the NSF through Grant No. DMR72-03106-A01.

Phys. Rev. B 14, 3569 – Published 15 October, 1976

DOI: https://doi.org/10.1103/PhysRevB.14.3569

Abstract

The cluster-Bethe-lattice method is extended to study the Weaire-Thorpe sp3 Hamiltonian. We derive a transformation which makes it possible to calculate the local density of states of a system described with a four-orbital Hamiltonian by using the local Green's function of a one-orbital Hamiltonian. We study the effects on the density of states of the presence of like-atom bonds in amorphous III-V semiconductors. We analyze two models: (a) like-atom bond in tetrahedral configuration, and (b) like-atom bond in triangular pyramidal configuration. Our results are in agreement with the experimental data.

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