Effective-medium approximation for energy-dependent hopping on a lattice

Authors
Rinn, B Braunschweig, U Maass, P Schirmacher, W
Citation
B. Rinn et al., Effective-medium approximation for energy-dependent hopping on a lattice, PHYS ST S-B, 218(1), 2000, pp. 93-97
Citations number
9
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICA STATUS SOLIDI B-BASIC RESEARCH
ISSN journal
03701972 → ACNP
Volume
218
Issue
1
Year of publication
2000
Pages
93 - 97
Database
ISI
SICI code
0370-1972(200003)218:1<93:EAFEHO>2.0.ZU;2-4
Abstract
We have generalised the standard lattice Coherent-Potential-Approximation ( CPA)/Effective-Medium-Approximation (EMA) scheme to include the case of ene rgy dependent hopping. This case is complicated by the fact that, due to th e detailed-balance condition, the hopping rates w(ij) are non-symmetric, i. e. w(ij) not equal w(ji). Results for the frequency dependent diffusion coe fficient are compared with Monte-Carlo simulations for a uniform and bimoda l site energy distribution.