Particle-Hole Symmetry and the Effect of Disorder on the Mott-Hubbard Insulator

Details Particle-Hole Symmetry and the Effect of Disorder on the Mott-Hubbard Insulator Particle-Hole Symmetry and the Effect of Disorder on the Mott-Hubbard Insulator

2001-06-11

arxiv.org/abs/cond-mat/0106204v1

Phys. Rev. Lett. 87, 146401 (2001)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.87.146401

Recent experiments have emphasized that our understanding of the interplay of electron correlations and randomness in solids is still incomplete. We address this important issue and demonstrate that particle-hole (ph) 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 ph-symmetry is preserved, and shows the opposite behavior, i.e. conductivity increases with increasing disorder, when ph-symmetry is broken. The Mott insulating gap is insensitive to weak disorder when there is ph-symmetry, whereas in its absence the gap diminishes with increasing disorder.

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