Investigation of the nonlocal coherent-potential approximation

Details Investigation of the nonlocal coherent-potential approximation Investigation of the nonlocal coherent-potential approximation

2006-03-14

arxiv.org/abs/cond-mat/0603370v1

J. Phys.: Condens. Matter 18 (2006) 3179-3195

Physics

Condensed Matter

Materials Science

18 pages, 5 figures

Scientific paper

10.1088/0953-8984/18/12/003

Recently the nonlocal coherent-potential approximation (NLCPA) has been introduced by Jarrell and Krishnamurthy for describing the electronic structure of substitutionally disordered systems. The NLCPA provides systematic corrections to the widely used coherent-potential approximation (CPA) whilst preserving the full symmetry of the underlying lattice. Here an analytical and systematic numerical study of the NLCPA is presented for a one-dimensional tight-binding model Hamiltonian, and comparisons with the embedded cluster method (ECM) and molecular coherent potential approximation (MCPA) are made.

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