Sensitivity of the Mott transition to noncubic splitting of the orbital degeneracy: Application to NH3K3C60

Article

关键词: INFINITE DIMENSIONS;    DOPED FULLERENES;    SUPERCONDUCTIVITY;    COULOMB;    MODEL;    C-60;    NMR;    INSULATOR;    FERMIONS;    SYSTEMS;   

DOI  :  10.1103/PhysRevB.66.115107

来源: SCIE

【 摘 要 】

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

【 授权许可】

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