title: Particle-hole symmetry and the effect of disorder on the Mott-Hubbard insulator.
abstract: The understanding of the interplay of electron correlations and randomness in solids is enhanced by demonstrating that particle-hole ( p-h) symmetry plays a crucial role in determining the effects of disorder on the transport and thermodynamic properties of the half-filled Hubbard Hamiltonian. We show that the low-temperature conductivity decreases with increasing disorder when p-h symmetry is preserved, and shows the opposite behavior, i.e., conductivity increases with increasing disorder, when p-h symmetry is broken. The Mott insulating gap is insensitive to weak disorder when there is p-h symmetry, whereas in its absence the gap diminishes with increasing disorder.
authors.affiliation: Lorentz Institute, Leiden University, P.O. Box 9506, 2300 RA Leiden, The Netherlands.
authors.forename: P J
authors.initials: PJ
authors.lastname: Denteneer
authors.forename: R T
authors.initials: RT
authors.lastname: Scalettar
authors.forename: N
authors.initials: N
authors.lastname: Trivedi