Particle-hole symmetry and the effect of disorder on the Mott-Hubbard insulator

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 sh...

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Published in:Physical review letters 2001-10, Vol.87 (14), p.146401-146401, Article 146401
Main Authors: Denteneer, P J, Scalettar, R T, Trivedi, N
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Language:English
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description 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.
doi_str_mv 10.1103/PhysRevLett.87.146401
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title Particle-hole symmetry and the effect of disorder on the Mott-Hubbard insulator
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