On the CTMA for the infiniteU Anderson impurity model

Autor:	Sebastian Duffe, H. Keiter, Klaus Baumgartner
Rok vydání:	2007
Předmět:	Physics Mean field theory Lattice (order) Quantum mechanics Condensed Matter::Strongly Correlated Electrons Strongly correlated material Fermi liquid theory Solver Condensed Matter Physics Integral equation Anderson impurity model Electronic Optical and Magnetic Materials Magnetic impurity
Zdroj:	physica status solidi (b). 244:2357-2361
ISSN:	1521-3951 0370-1972
DOI:	10.1002/pssb.200674637
Popis:	If one wants to deal with strongly correlated electron lattice systems within dynamical mean field theory, one needs an impurity solver, i.e. a solution for the dynamics of the Anderson magnetic impurity problem. The most ambitious approach to that problem has been the consistent t-matrix approximation (CTMA). The basic integral equations could be solved with a slow variable approximation, which compared well with a direct numerical solution. Fermi-liquid behavior was not obtained, presumably the normalscatter-ing potential was treated approximately only. We show, how the normal scattering potential can be included exactly.
Databáze:	OpenAIRE
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