Minimal charge gap in the ionic Hubbard model

2003/01/31 by Krunoslav Požgajčić, K. Pozgajcic, C. Gros +1 · 1 citation
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetism in coordination complexes #Physics of Superconductivity and Magnetism #cond-mat.str-el

paper · pdf · doi:10.1103/physrevb.68.085106

published as PRB, Vol.68, 085106 (2003) · 5 pages with 7 figures; minor corrections

openalex publication_date 2003/08/14 · arxiv created 2003/09/16 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

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.

Citations

• Nature of the Peierls- to Mott-insulator transition in 1D
• From Band Insulator to Mott Insulator in One Dimension

Cited by

• Quantum critical behavior of the one-dimensional ionic Hubbard model