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.
@article{arxiv.cond-mat/0603370,
title = {Investigation of the nonlocal coherent-potential approximation},
author = {D. A. Rowlands},
journal= {arXiv preprint arXiv:cond-mat/0603370},
year = {2009}
}