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arXiv 0812.2524cond-mat.str-el
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金属-绝缘体相变附近的量子非磁态--自旋液体态的一种可能候选

Quantum Non-Magnetic state near Metal-Insulator Transition - a Possible Candidate of Spin Liquid State

Gao-Yong Sun, Su-Peng Kou

摘要:

本文在O(3)非线性西格玛模型的基础上,研究了二维Pi-通量哈伯德模型的半满态.在金属-绝缘体相变附近发现了一种量子非磁性绝缘体,它可能是自旋液体态的一个候选者。这种方形晶格上的量子非磁性绝缘体不是由挫折引起的。相反,它起源于具有相对小的有效自旋矩的量子自旋涨落。在强耦合极限下,自旋速度和自旋序参量的计算结果与以前的计算结果一致。

英文摘要:

In this paper, based on the formulation of an O(3) non-linear sigma model, we study the two-dimensional Pi-flux Hubbard model at half-filling. A quantum non-magnetic insulator is explored near the metal-insulator transition that may be a possible candidate of the spin liquid state. Such quantum non-magnetic insulator on square lattice is not induced by frustrations. Instead, it originates from quantum spin fluctuations with relatively small effective spin moments. In the strong-coupling limit, our results of the spin velocity and spin order parameter agree with results obtained from earlier calculations.

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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