Abstract
The optical conductivity, σ(ω), of the two-dimensional one-band Hubbard model is calculated at finite temperature using exact diagonalization techniques on finite clusters. The in-plane dc resistivity, , is also evalauted. We find that at large U/t and temperature T, is approximately linear with temperature. We also observed that σ(ω) displays charge excitations, a midinfrared (MIR) band, and a Drude peak. The combination of the Drude peak and the MIR oscillator strengths leads to a conductivity that decays slower than 1/ at energies smaller than the insulator gap near half filling.
- Received 26 January 1994
DOI:https://doi.org/10.1103/PhysRevB.50.452
©1994 American Physical Society