We study a spinless two-band model at half-filling in the limit of infinite dimensions. The ground state of this model in the noninteracting limit is a band insulator. We identify transitions to a metal and to a charge Mott insulator, using a combination of analytical, quantum Monte Carlo, and zero temperature recursion methods. The metallic phase is a non-Fermi-liquid state with algebraic local correlation functions with universal exponents over a range of parameters.

arXiv:cond-mat/9312021Physical Review LettersApr 25, 1994102 citations

arXiv:cond-mat/9905418 · The European Physical Journal B

Born effective charge reversal and metallic threshold state at a band insulator-Mott insulator transition

Nikitas I. Gidopoulos, Sandro Sorella, Erio Tosatti

Published Mar 1, 2000• 35 citations

arXiv HTML PDF

DOI: 10.1007/s100510050123

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{C}_{4v}

crystalline point group and cannot be adiabatically connected to any band insulator with time-reversal symmetry. Furthermore, we study the nonmagnetic quantum phase transitions from the metal to the FMI and find that this Mott metal-insulator transition is characterized by the splitting of the noninteracting bands due to interaction effects.