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Seminars & Lectures

* TITLE

Metal-insulator transitions in the half-filled ionic Hubbard model

* SPEAKERS

Name	Affiliation	E-mail
Dr. Anh-Tuan Hoang	VAST, Vietnam	sec(at)apctp.org

* HOST(Applicant)

Name	Affiliation	E-mail
-

* DATE / TIME

2009-08-17, 09:30~10:00

* PLACE

APCTP Headquarters, Pohang, Korea

* ABSTRACT

We study electronic phase transitions in the half-filled ionic Hubbard model with an on-site Coulomb repultion U and an ionic energy Δ by using the coherent potential approximation in combination with the semielliptical density of states for free electrons on a Bethe lattice. For a fixed and finite Δ two transitions from the band insulator via a metallic state to a Mott insulator are found with increasing U. The values of the critical correlations driven
metal-insulator transitions Uc1 (Δ) and Uc2(Δ) are estimated. Our results are in reasonable agreement with the ones obtained by the single-site dynamical mean field theory and the determinant quantum Monte Carlo simulation.

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