Eur. Phys. J. B (2013) 86: 503
https://doi.org/10.1140/epjb/e2013-40896-1

Regular Article

Coherent potential approximation study of the Mott transition in optical lattice system with site-dependent interactions

¹ Faculty of Physics, HNUE, Xuan Thuy 136, Cau Giay, 10000 Hanoi, Vietnam
² Quang Ninh Teacher Training College, Nam Khe, Uong Bi, Quang Ninh, Viet Nam
³ Institute of Physics, VAST, 10 Dao Tan, Ba Dinh, 10000 Hanoi, Vietnam

^a e-mail: anhld@hnue.edu.vn

Received: 7 October 2013
Received in final form: 5 November 2013
Published online: 11 December 2013

Abstract

We study the Mott transition in the half-filled Hubbard model with spatially alternating interactions by means of the coherent potential approximation. The phase boundary between metallic and insulating phases at zero temperature is derived and the nature of the Mott states is also considered. Our results are in good agreement with the ones recently obtained by the two-site dynamical mean-field theory.