Mott Transition in Degenerate Hubbard Models: Application to Doped Fullerenes
Preprint
- 23 August 1996
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.Keywords
All Related Versions
- Version 1, 1996-08-23, ArXiv
- Published version: Physical Review B, 54 (16), R11026.
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