Vol. 29 No. 3SI (2019)
Papers

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

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

Published 22-10-2019

How to Cite

Yen, N. T. H., Anh, L. D., Tuan, H. A., Thang, N. T., & Huong, N. T. (2019). Mott Transition in the Mass Imbalanced Ionic Hubbard Model at Half Filling. Communications in Physics, 29(3SI), 305. https://doi.org/10.15625/0868-3166/29/3SI/14265
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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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