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Particle-Hole Symmetry and the Effect of Disorder on the Mott-Hubbard Insulator | | P.J.H. Denteneer
; R.T. Scalettar
; N. Trivedi
; | | Date: |
11 Jun 2001 | | Journal: | Phys. Rev. Lett. 87, 146401 (2001) | | Subject: | Strongly Correlated Electrons; Mesoscopic Systems and Quantum Hall Effect; Statistical Mechanics | cond-mat.str-el cond-mat.mes-hall cond-mat.stat-mech | | Affiliation: | Leiden University, The Netherlands), R.T. Scalettar (UC Davis, USA), N. Trivedi (Tata Institute, India | | Abstract: | 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. | | Source: | arXiv, cond-mat/0106204 | | Services: | Forum | Review | PDF | Favorites | |
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