Within dynamical mean-field theory, we study the metal-insulator transition of a twofold orbitally degenerate Hubbard model as a function of a splitting Delta of the degeneracy. The phase diagram in the U-Delta plane exhibits two-band and one-band metals, as well as the Mott insulator. The correlated two-band metal is easily driven to the insulator state by a strikingly weak splitting Delta
Sensitivity of the Mott transition to noncubic splitting of the orbital degeneracy: Application to NH3K3C60 / Manini, N; Santoro, Giuseppe Ernesto; Dal Corso, Andrea; Tosatti, Erio. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 66:11(2002), pp. 115107.1-115107.7. [10.1103/PhysRevB.66.115107]
Sensitivity of the Mott transition to noncubic splitting of the orbital degeneracy: Application to NH3K3C60
Santoro, Giuseppe Ernesto;Dal Corso, Andrea;Tosatti, Erio
2002-01-01
Abstract
Within dynamical mean-field theory, we study the metal-insulator transition of a twofold orbitally degenerate Hubbard model as a function of a splitting Delta of the degeneracy. The phase diagram in the U-Delta plane exhibits two-band and one-band metals, as well as the Mott insulator. The correlated two-band metal is easily driven to the insulator state by a strikingly weak splitting Delta| File | Dimensione | Formato | |
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