Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2002-05-14
Physics
Condensed Matter
Strongly Correlated Electrons
32 pages (Latex with PTPTeX.sty), with 61 figures. To appear in Prog. Theor. Phys. 108 (2002) vol.1
Scientific paper
10.1143/PTP.108.59
Normal states of the attractive Hubbard model, especially in two dimension, are studied in the light of a transition from a Fermi liquid to an insulating or gapped state. A series of variational Monte Carlo calculations with better statistics is carried out to estimate accurately expectation values by several many-body wave functions. Although a relatively clear crossover is observed even in the plain Gutzwiller wave function, the states in both regimes are metallic. Meanwhile, a substantial metal-insulator transition takes place at |U|\sim W (band width) in an improved wave function in which intersite correlation is introduced by taking account of virtual states in the second-order perturbation in the infinite-|U| limit. The critical value is favorably compared with recent results of the dynamical-mean-field approximation. In contrast, a conventional Jastrow-type wave functions scarcely improve the normal state. In addition, the issue of Brinkman-Rice metal-insulator transition is reconsidered with much larger systems.
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