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Quasiparticles in transition metals with strong local correlations: band formation and collective effects
Author(s) -
Grewe N.
Publication year - 2005
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.200510151
Subject(s) - anderson impurity model , condensed matter physics , quasiparticle , physics , impurity , magnetic impurity , kondo effect , spin (aerodynamics) , cluster (spacecraft) , magnetic moment , singlet state , band gap , electron , electronic band structure , quantum mechanics , excited state , superconductivity , computer science , thermodynamics , programming language
Dedicated to Bernhard Mühlschlegel on the occasion ofhis 80th birthdayWe address the question, whether low lying one‐particle excitations in the Fermi‐liquid phase of highly correlated electron systems can form well defined bands of nearly stable quasiparticles, and comment on features of a universal band picture for these systems. We outline how to derive a description of instabilities to magnetic, charged ordered or superconducting phases, which bears a close analogy to Stoner theory and lends itself to an interpretation in terms of quasiparticle bands and residual interactions at low temperatures. Concepts and problems are illustrated via calculations for some standard models of solid‐state theory using modern many‐body techniques like NRG, NCA and DMFT. Differences to conventional band structure theory are pointed out. We shortly comment on the relevance of these questions to the physics of inhomogeneous systems and small particles.