Multi-Orbital Hubbard Model in Infinite Dimensions: Quantum Monte Carlo Calculation
Strongly Correlated Electrons
2009-10-31 v1
Abstract
Using Quantum Monte Carlo 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 Mott gap, and increasing quasi-particle spectral weight. In opposition, Hund's rule exchange coupling decreases the critical on-site Coulomb energy for the Mott transition. The metallic regime resistivity for two-fold degeneracy is quadratic-in-temperature at low temperatures.
Keywords
Cite
@article{arxiv.cond-mat/9806180,
title = {Multi-Orbital Hubbard Model in Infinite Dimensions: Quantum Monte Carlo Calculation},
author = {J. E. Han and M. Jarrell and D. L. Cox},
journal= {arXiv preprint arXiv:cond-mat/9806180},
year = {2009}
}
Comments
4 pages, 4 figures, to be published in PRB