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Strong coupling Kondo lattice model as a Fermi gas

Journal article
Authors Stellan Östlund
Published in Physical Review B
Volume 76
Pages 153101
ISSN 1098-0121
Publication year 2007
Published at Department of Physics (GU)
Pages 153101
Language en
Subject categories Physical Sciences, Condensed Matter Physics, Superconductivity


The strong coupling half-filled Kondo lattice model is an important example of a strongly interacting dense Fermi system for which conventional Fermi gas analysis has thus far failed. We remedy this by deriving an exact transformation that maps the model to a dilute gas of weakly interacting electron and hole quasiparticles that can then be analyzed by conventional dilute Fermi gas methods. The quasiparticle vacuum is a singlet Mott insulator for which the quasiparticle dynamics are simple. Since the transformation is exact, the electron spectral weight sum rules are obeyed exactly. Subtleties in the behavior of electrons in the singlet Mott insulator can be reduced to a complicated but precise relation between quasiparticles and bare electrons. The theory of free quasiparticles can also be interpreted as an exactly solvable model for a singlet Mott insulator, providing an exact model in which to explore the strong coupling regime of a singlet Kondo insulator.

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