Effect of singlet pairing hopping on the one-dimensional extended Hubbard model with spin exchange interaction

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• 作者：H. Q. Ding (1)
  J. Zhang (1) dinghanqinxjdx@163.com
• 关键词：Solid State and Materials
• 刊名：The European Physical Journal B - Condensed Matter
• 出版年：2012
• 出版时间：June 2012
• 年：2012
• 卷：85
• 期：6
• 页码：DOI: 10.1140/epjb/e2
• 全文大小：262.2 KB
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• 作者单位：1. School of Physical Science and Technology, Xinjiang University, Urumqi, 830046 P.R. China
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Condensed Matter
  Physics
  Complexity
  Fluids
  Solid State Physics and Spectroscopy
  Superconductivity, Superfluidity and Quantum Fluids
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1434-6036

文摘

The ground-state properties of the one-dimensional (1D) t-U-J model with singlet pair hopping interaction are studied in the weak-coupling regime. The analysis of the model with U(1) ⊗ SU(2) symmetry is performed using the bosonization and renormalization-group approaches. At half filling the phase diagram is shown to consist of three different insulating states corresponding to the Peierls dimerized bond-charge-density-wave (BCDW) phase, the spin-density-wave (SDW) phase and the bond-spin-density-wave (BSDW) phase, and two different superconducting states with the singlet-superconducting (SS) phase and the triplet-superconducting (TS) phase. Moreover, the SDW, BSDW and TS phases are all degenerated. The result indicates that the pair hopping interaction P has a strong effect on the ground-state properties of 1D correlated electron systems.