Dynamic conductivity of strongly correlated electrons: The Hubbard model on a cubic lattice
Phys. Rev. B 46, 5499 – Published 1 September, 1992
DOI: https://doi.org/10.1103/PhysRevB.46.5499
Abstract
The frequency-dependent (optical) conductivity of the Hubbard model on a three-dimensional cubic lattice is studied through calculations on a small cluster. The interaction strength is varied between the weak- and strong-coupling limits. Results are reported for the half-filled band, and for small hole dopings away from half filling. The formation of a Hubbard gap is observed. Results are related to aspects of the current discussion of the metal-insulator transition in bulk systems.