Program

P.2 -- Poster, NCTP-42

Date: Tuesday, 1 August 2017

Time: 16h00 - 17h30

Electronic phase diagram in the half-filled ionic Hubbard model with site-dependent interactions

Thi-Hai-Yen Nguyen (1), Anh-Tuan Hoang (1), Thi-Huong Nguyen (2), and Duc-Anh Le (3)

(1) Institute of Physics - VAST (2) Water Resources University, Tay Son 175, Dong Da, Hanoi (3) Hanoi National University of Education, Xuan Thuy 136, Cau Giay, Hanoi

A repulsive Hubbard model with spatially alternating interactions $(U_A \neq U_B)$ and a staggered potential, which may be realized by cold atoms in optical lattices, is studied by means of the coherent potential approximation. The paramagnetic phase diagram for the half-filled model is obtained. It is found that for the model with $U_A \neq U_B$ a metallic region considerably enlarges in comparison with that of the conventional ionic Hubbard model $(U_A = U_B)$.

Presenter: Hoang Anh - Tuan