Optical conductivity of the Hubbard and t - J models

Journal Article · Sat Sep 01 04:00:00 EDT 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.42.4786· OSTI ID:6276779

Moreo, A; Dagotto, E ^[1]

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1. University of California at Santa Barbara, Santa Barbara, CA (USA). Department of Physics University of California at Santa Barbara, Santa Barbara, CA (USA). Institute for Theoretical Physics

We calculate the optical conductivity {sigma}({omega}) of the Hubbard and {ital t}-{ital J} models on 10- and 16-site lattices, respectively, using a Lanczos method. Results are presented for various values of the couplings {ital U}/{ital t}, {ital J}/{ital t}, and band fillings, using free- and periodic-boundary conditions. We discuss the behavior of the kinetic energy in the ground state, the distribution of spectral weight of {sigma}({omega}) between low and high energies and the sum rule. Indications of a Drude-like peak at low energy in the one-hole subspace are observed in both models. Assuming that holes behave like independent (mass-renormalized) particles in the normal state of the superconductors, our results also suggest that the optical midinfrared broadband observed experimentally can be explained by hole excitations of strongly correlated systems.

• DOE Contract Number: FG03-85ER45197
• OSTI ID: 6276779
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 42:7; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

656100* -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BAND THEORY
BOUNDARY CONDITIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
ENERGY LEVELS
GROUND STATES
HIGH-TC SUPERCONDUCTORS
HOLES
INFRARED RADIATION
PHOTOCONDUCTIVITY
PHYSICAL PROPERTIES
RADIATIONS
SUPERCONDUCTORS