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arXiv 1111.5304cond-mat.str-elcond-mat.stat-mechhep-th
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Hubbard-Shastry格点模型

Hubbard-Shastry lattice models

Sergey Frolov, Eoin Quinn

摘要:

本文考虑了强关联电子的两种一维精确可解晶格模型。除了哈伯德模型和su(2| 2)自旋链,这些是唯一可以从Shastry的R-矩阵获得的宇称不变模型。一个表现出巡回铁磁行为,而对于其他的电子形成绑定对,并在半填充的模型成为绝缘。我们推导出TBA方程的模型,分析它们在各种限制,特别是获得零温度相图。此外,我们考虑扩展的模型,减少到Essler-Korepin-Schoutens模型在一定的限制。

英文摘要:

We consider two lattice models for strongly correlated electrons which are exactly-solvable in one dimension. Along with the Hubbard model and the su(2|2) spin chain, these are the only parity-invariant models that can be obtained from Shastry's R-matrix. One exhibits itinerant ferromagnetic behaviour, while for the other the electrons form bound pairs and at half-filling the model becomes insulating. We derive the TBA equations for the models, analyze them at various limits, and in particular obtain zero temperature phase diagrams. Furthermore we consider extensions of the models, which reduce to the Essler-Korepin-Schoutens model in certain limits.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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