Mott Transition in Degenerate Hubbard Models: Application to Doped Fullerenes
Abstract
The Mott-Hubbard transition is studied for a Hubbard model with orbital degeneracy N, using a diffusion Monte-Carlo method. Based on general arguments, we conjecture that the Mott-Hubbard transition takes place for U/W N, where U is the Coulomb interaction and W is the band width. This is supported by exact diagonalization and Monte-Carlo calculations. Realistic parameters for the doped fullerenes lead to the conclusion that stoichiometric A3 C60 (A=K, Rb) are near the Mott-Hubbard transition, in a correlated metallic state.
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