Vol. 24 No. 3S2 (2014)
Papers

Conductivity in Half-filled Ionic Hubbard Model

Nguyen Danh Tung
Institute of Physics, VAST
Hoang Anh Tuan
Institute of Physics, VAST

Published 06-10-2014

Keywords

  • static conductivity,
  • ionic Hubbard model,
  • coherent potential approximation

How to Cite

Tung, N. D., & Tuan, H. A. (2014). Conductivity in Half-filled Ionic Hubbard Model. Communications in Physics, 24(3S2), 18–22. https://doi.org/10.15625/0868-3166/24/3S2/5048

Abstract

We calculate the temperature dependent conductivity in the half-filled ionic Hubbard model with an on-site Coulomb repulsion $U$ and an ionic energy $\Delta$ by mean of the coherent potential approximation. It is shown that for intermediate and large \(\Delta\) the largest conductivity occurs near the special value \(U = 2 \Delta\) at all temperatures \(T\), for a fixed \(\Delta\) the region of finite conductivity \([U_{c1}, U_{c2}]\) expands and its maximum decreases with increasing \(T\). Our results are in good agreement with those derived from the determinant quantum Monte Carlo simulation.

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