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On the CTMA for the infinite U Anderson impurity model
Author(s) -
Keiter Hellmut,
Baumgartner Klaus,
Duffe Sebastian
Publication year - 2007
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200674637
Subject(s) - impurity , anderson impurity model , solver , physics , scattering , lattice (music) , matrix (chemical analysis) , magnetic field , condensed matter physics , fermi liquid theory , statistical physics , electron , quantum mechanics , mathematical physics , mathematics , chemistry , mathematical optimization , chromatography , acoustics
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 normalscattering potential was treated approximately only. We show, how the normal scattering potential can be included exactly. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)