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arXiv math-ph/0610028math-phcond-mat.stat-mechmath.MPnlin.SI
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量子转移矩阵的Q算子

A Q-operator for the quantum transfer matrix

Christian Korff

摘要:

利用量子群的表示理论,构造了XXZ自旋链量子转移矩阵的Baxter Q算符。讨论了该Q算子的谱,并导出了描述XXZ自旋链有限温度区的新的函数关系。对于非零磁场,以前已知的Bethe ansatz方程可以用二次方程组代替,这对于数值研究来说是一个重要的优势。当磁场和有理耦合值为零时,量子转移矩阵在单位根处表现出与经典六顶点转移矩阵密切相关的圈代数对称性.

英文摘要:

Baxter's Q-operator for the quantum transfer matrix of the XXZ spin-chain is constructed employing the representation theory of quantum groups. The spectrum of this Q-operator is discussed and novel functional relations which describe the finite temperature regime of the XXZ spin-chain are derived. For non-vanishing magnetic field the previously known Bethe ansatz equations can be replaced by a system of quadratic equations which is an important advantage for numerical studies. For vanishing magnetic field and rational coupling values it is argued that the quantum transfer matrix exhibits a loop algebra symmetry closely related to the one of the classical six-vertex transfer matrix at roots of unity.

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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