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arXiv 1708.04062cond-mat.stat-mechcond-mat.str-elhep-th
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可积格点模型动力学关联函数的热形状因子方法

Thermal form-factor approach to dynamical correlation functions of integrable lattice models

Frank Göhmann, Michael Karbach, Andreas Klümper, Karol K. Kozlowski, Junji Suzuki

摘要:

本文提出了一种计算Yang-Baxter型可积格点模型中有限温度下动力学关联函数的方法。该方法是基于扩展的关联函数作为一个系列的矩阵元素的时间相关的量子传输矩阵,而不是哈密顿量。在无限Trotter数限制的矩阵元素变得与时间无关,并变成热的形状因子,以前研究的背景下,静态关联函数。我们用XXZ模型的例子来说明这一点。我们展示了如何利用某些辅助函数求解有限组非线性积分方程的形状因子。XX模型的情况下,制定了更详细的导致一个新的形状因子系列表示的动态横向两点函数。

英文摘要:

We propose a method for calculating dynamical correlation functions at finite temperature in integrable lattice models of Yang-Baxter type. The method is based on an expansion of the correlation functions as a series over matrix elements of a time-dependent quantum transfer matrix rather than the Hamiltonian. In the infinite Trotter-number limit the matrix elements become time independent and turn into the thermal form factors studied previously in the context of static correlation functions. We make this explicit with the example of the XXZ model. We show how the form factors can be summed utilizing certain auxiliary functions solving finite sets of nonlinear integral equations. The case of the XX model is worked out in more detail leading to a novel form-factor series representation of the dynamical transverse two-point function.

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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