Minimal charge gap in the ionic Hubbard model

Details Minimal charge gap in the ionic Hubbard model Minimal charge gap in the ionic Hubbard model

2003-01-21

arxiv.org/abs/cond-mat/0301376v2

PRB, Vol.68, 085106 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages with 7 figures; minor corrections

Scientific paper

10.1103/PhysRevB.68.085106

We study the ionic Hubbard model at temperature T=0 within the mean-field approximation, and show that the charge gap does not close completely at the ionic-band insulator to antiferromagnetic insulator transition, contrary to previous expectations. Furthermore, we find an intermediate phase for on-site repulsions $U>U_c$ for different lattices, and calculate the phase diagram for the ionic Hubbard model with alternating U, corresponding to a Cu-O lattice.

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