TY - JOUR AU - Yen, Nguyen Thi Hai AU - Anh, Le Duc AU - Tuan, Hoang Anh AU - Thang, Nguyen Toan AU - Huong, Nguyen Thi PY - 2019/10/22 Y2 - 2024/03/29 TI - Mott Transition in the Mass Imbalanced Ionic Hubbard Model at Half Filling JF - Communications in Physics JA - Comm. Phys. VL - 29 IS - 3SI SE - Papers DO - 10.15625/0868-3166/29/3SI/14265 UR - https://vjs.ac.vn/index.php/cip/article/view/14265 SP - 305 AB - The Mott - Hubbard metal - insulator transition in the half-filled mass imbalanced ionic Hubbard model is investigated using the two-site dynamical mean field theory. We find that for a fixed mass imbalanced parameter r the critical interaction Uc increases when the ionic energy \(\Delta\) is increased. In the other hand, for a fixed \(\Delta\), \(U_c\) decreases with increasing the mass imbalance. We also show the existence of BI phase in the system for the case \(\Delta e 0\), \(U=0\) and calculate the staggered charge density \(n_B − n_A\) as a function of the interaction for different values of the mass imbalance. Our results in the limiting cases (\(r = 1\); \(\Delta e 0\) or/and \(\Delta = 0\); \(r e 1\)) are in good agreement with those obtained from full dynamical mean field theory. ER -