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Ionic Hubbard model
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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 ∆ is increased.
8p
capheny
28-02-2020
10
2
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We calculate the temperature dependent conductivity in the half-filled ionic Hubbard model with an on-site Coulomb repulsion U and an ionic energy ∆ by mean of the coherent potential approximation. It is shown that for intermediate and large ∆ the largest conductivity occurs near the special value U = 2∆ at all temperatures T , for a fixed ∆ the region of finite conductivity [Uc1,Uc2] expands and its maximum decreases with increasing T . Our results are in good agreement with those derived from the determinant quantum Monte Carlo simulation.
5p
thuyliebe
09-10-2018
17
1
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