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
Year2010
Month9
Day15
Volume Number12
PublisherIOP PUBLISHING LTD
ISSN1367-2630
LanguagesEnglish-United Kingdom
Web of Science Subject CategoriesPhysics; Physics, Multidisciplinary; PHYSICS, MULTIDISCIPLINARY

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