Optical conductivity in dynamic Hubbard model

ORAL

Abstract

The Dynamic Hubbard model is a candidate to capture the physics of two-band Hubbard models, such as the enhancement of critical Hubbard $U$ for the Mott transition. A pseudo-spin $1/2$ auxiliary field, which modifies the Coulomb $U$ interaction based on the on-site occupancy of electrons, breaks the electron-hole symmetry normally associated with the Hubbard model. The dependence of optical conductivity on the number of particles also reveals the effect of the pseudo-spin on the spectral weight distribution as a function of frequency.

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Authors

  • Giang Bach

    • Department of Physics, University of Alberta, Edmonton, Alberta, Canada, T6G 2J1

  • J.E. Hirsch

    • Department of Physics, University of California, San Diego, La Jolla, California, 92093-0319
    • University of California San Diego

  • Frank Marsiglio

    • Department of Physics, University of Alberta, Edmonton, Alberta, Canada, T6G 2J1
    • Department of Physics, University of Alberta, Edmonton, Alberta, Canada T6G 2G7