Bond-located spin density wave phase in the two-dimensional (2D) ionic Hubbard model
Publication in refereed journal

香港中文大學研究人員

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摘要We 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.
著者Chen HM, Zhao H, Lin HQ, Wu CQ
期刊名稱New Journal of Physics
出版年份2010
月份9
日期15
卷號12
出版社IOP PUBLISHING LTD
國際標準期刊號1367-2630
語言英式英語
Web of Science 學科類別Physics; Physics, Multidisciplinary; PHYSICS, MULTIDISCIPLINARY

上次更新時間 2021-23-01 於 00:44