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 \propto \sqrt{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 A_3 C_60 (A=K, Rb) are near the Mott-Hubbard transition, in a correlated metallic state.

4 pages, revtex, 1 eps figure included, to be published in Phys.Rev.B Rapid Comm

References in corpus (3)

• Electron--Vibron Interactions and Berry Phases in Charged Buckminsterfullerene: Part I
• Metal-Insulator Transitions in Degenerate Hubbard Models and A${}_x$C${}_{60}$
• Low-Temperature Behavior of the Large-U Hubbard Model from High-Temperature Expansions

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