Abstract
We have studied the metal-insulator transition at integer fillings in a triply degenerate Hubbard model using the Lanczos method. The critical Coulomb interaction strength is found to depend strongly on the band filling, with is the bandwidth) at half filling for this case with threefold degeneracy. We discuss the implications of our results on metal-insulator transitions in strongly correlated systems in general, and on the unusual electronic ground state of the alkali-metal-doped fullerenes, in particular.
- Received 21 July 1998
DOI:https://doi.org/10.1103/PhysRevB.59.1739
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