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Mott Transition in Degenerate Hubbard Models: Application to Doped Fullerenes | | Olle Gunnarsson
; Erik Koch
; Richard M. Martin
; | | Date: |
23 Aug 1996 | | Journal: | Phys. Rev. B 54, R11026 (1996) | | Subject: | cond-mat | | Affiliation: | 1,2), and Richard M. Martin (1,2) ( Max-Planck-Institut für Festkörperforschung, Stuttgart, _Department of Physics, University of Illinois, Urbana-Champaign | | 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. | | Source: | arXiv, cond-mat/9608107 | | Other source: | [GID 809683] pmid9984977 | | Services: | Forum | Review | PDF | Favorites | |
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