Breakdown of Luttinger's theorem in two-orbital Mott insulators

A. Rosch ()

The European Physical Journal B: Condensed Matter and Complex Systems, 2007, vol. 59, issue 4, 495-502

Abstract: An analysis of Luttinger's theorem shows that – contrary to recent claims – it is not valid for a generic Mott insulator. For a two-orbital Hubbard model with two electrons per site the crossover from a non-magnetic correlated insulating phase (Mott or Kondo insulator) to a band insulator is investigated. Mott insulating phases are characterized by poles of the self-energy and corresponding zeros in the Greens functions defining a “Luttinger surface” which is absent for band insulators. Nevertheless, the ground states of such insulators with two electrons per unit cell are adiabatically connected. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2007

Keywords: 71.10.-w Theories and models of many-electron systems; 71.10.Fd Lattice fermion models (Hubbard model; etc.); 71.30.+h Metal-insulator transitions and other electronic transitions (search for similar items in EconPapers)
Date: 2007
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Citations: View citations in EconPapers (1)

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DOI: 10.1140/epjb/e2007-00312-3

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