Multiorbital Hubbard model in infinite dimensions: Quantum Monte Carlo calculation

Article

关键词: METAL-INSULATOR TRANSITIONS;    DYNAMICAL MEAN-FIELD;    MOTT TRANSITION;   

DOI  :  10.1103/PhysRevB.58.R4199

来源: SCIE

【 摘 要 】

Using the quantum Monte Carlo technique we compute thermodynamics and spectra for the orbitally degenerate Hubbard model in infinite spatial dimensions. With increasing orbital degeneracy we find in the one-particle spectra broader Hubbard bands (consistent with increased kinetic energy), a narrowing Mon gap, and increasing quasiparticle spectral weight. Hund's rule exchange coupling decreases the critical on-site Coulomb energy for the Mott transition. The metallic regime resistivity for twofold degeneracy is quadratic in temperature at low temperatures.

【 授权许可】

Free