Paramagnetic metal-insulator transition in the 2D Hubbard model

Details Paramagnetic metal-insulator transition in the 2D Hubbard model Paramagnetic metal-insulator transition in the 2D Hubbard model

1998-10-20

arxiv.org/abs/cond-mat/9810246v1

Physics

Condensed Matter

Strongly Correlated Electrons

RevTex-file, 4 PRB pages with 5 eps figures. Hardcopies of figures (or the entire manuscript) can be obtained by e-mail reques

Scientific paper

We study the transition from paramagnetic metal to paramagnetic insulator by finite temperature Quantum Monte-Carlo simulations for the 2D Hubbard model at half-filling. Working at the moderately high temperature T=0.33*t where the spin correlation length has dropped to 1.5 lattice spacings, and scanning the interaction strength U, we observe an unambiguous metal-insulator transition with onset at U_c=4t. In the metallic phase there are no indications of any `correlation narrowing' of the band width, nor for any decrease of spectral weight at the Fermi energy. The Mott-Hubbard gap opens gradually with increasing U and is accompanied by the formation of side bands near the Fermi energy. In the first stages of gap formation the gap opens at (pi,0), reminiscent of the `pseudogap' phenomenology in cuprate superconductors.

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