Mott Transition in the Mass Imbalanced Ionic Hubbard Model at Half Filling

Nguyen Thi Hai Yen; Le Duc Anh; Hoang Anh Tuan; Nguyen Toan Thang; Nguyen Thi Huong

doi:10.15625/0868-3166/29/3SI/14265

Mott Transition in the Mass Imbalanced Ionic Hubbard Model at Half Filling

Nguyen Thi Hai Yen, Le Duc Anh, Hoang Anh Tuan, Nguyen Toan Thang, Nguyen Thi Huong

Author affiliations

Authors

Nguyen Thi Hai Yen Institute of Physics, Vietnam Academy of Science and Technology (VAST)
Le Duc Anh Hanoi National University of Education
Hoang Anh Tuan Institute of Physics, Vietnam Academy of Science and Technology (VAST) and Graduate University of Science and Technology, VAST
Nguyen Toan Thang Institute of Physics, Vietnam Academy of Science and Technology
Nguyen Thi Huong Thuy loi University

DOI:

https://doi.org/10.15625/0868-3166/29/3SI/14265

Abstract

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 \(\Delta \ne 0\), \(U=0\) 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 (\(r = 1\); \(\Delta \ne 0\) or/and \(\Delta = 0\); \(r\ne 1\)) are in good agreement with those obtained from full dynamical mean field theory.

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Published

22-10-2019

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[1]

N. T. H. Yen, L. D. Anh, H. A. Tuan, N. T. Thang, and N. T. Huong, “Mott Transition in the Mass Imbalanced Ionic Hubbard Model at Half Filling”, Comm. Phys., vol. 29, no. 3SI, p. 305, Oct. 2019.

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Vol. 29 No. 3SI (2019)

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