Bond-located spin density wave phase in the two-dimensional (2D) ionic Hubbard model
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AbstractWe investigate the quantum phase transitions in the half-filled ionic Hubbard model on a two-dimensional (2D) square lattice using the variational cluster approach (VCA). We present explicit evidence for the tendency toward a novel intermediate phase in this model. This phase is characterized by bond-located magnetization. For weak Coulomb repulsion U, the system is a band insulator, and then undergoes a transition to the intermediate phase at the first-phase boundary U = U(c1). As U is increased beyond the second transition point U(c2), there occurs a Mott insulator accompanied by a long-range antiferromagnetic (AF) order. The bond-located spin density wave competes with the antiferromagnetism while the charge-density modulation exists all the way due to the staggered potential Delta.
All Author(s) ListChen HM, Zhao H, Lin HQ, Wu CQ
Journal nameNew Journal of Physics
Volume Number12
LanguagesEnglish-United Kingdom
Web of Science Subject CategoriesPhysics; Physics, Multidisciplinary; PHYSICS, MULTIDISCIPLINARY

Last updated on 2021-24-02 at 00:39