Breakdown of Luttinger's theorem in two-orbital Mott insulators |
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Authors: | A Rosch |
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Institution: | (1) Institute for Theoretical Physics, University of Cologne, 50937 Cologne, Germany |
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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. |
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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 |
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