Conductivity in Half-filled Ionic Hubbard Model

Nguyen Danh Tung; Hoang Anh Tuan

doi:10.15625/0868-3166/24/3S2/5048

Conductivity in Half-filled Ionic Hubbard Model

Nguyen Danh Tung, Hoang Anh Tuan

Author affiliations

Authors

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

DOI:

https://doi.org/10.15625/0868-3166/24/3S2/5048

Keywords:

static conductivity, ionic Hubbard model, coherent potential approximation

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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Published

06-10-2014

How to Cite

[1]

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

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Issue

Vol. 24 No. 3S2 (2014)

Section

Papers

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