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

Thermal form-factor approach to dynamical correlation functions of integrable lattice models
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可积晶格模型动态相关函数的热形状因子方法

DOI:
10.1088/1742-5468/aa9678
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发表时间:
2017
期刊:
Journal of Statistical Mechanics: Theory and Experiment
影响因子:
--
通讯作者:
J. Suzuki
J. Suzuki
中科院分区:
--
文献类型:
--
作者:
F. Göhmann;M. Karbach;A. Klümper;K. K. Kozlowski;J. Suzuki

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我们提出了一种在杨-巴克斯特型可积晶格模型中计算有限温度下动态相关函数的方法。该方法基于相关函数的展开,作为时间相关量子转移矩阵的矩阵元素的级数,而不是哈密顿量。在无限 Trotter 数限制下,矩阵元素变得与时间无关,并转变为先前在静态相关函数的背景下研究的热形状因子。我们通过 XXZ 模型的例子来明确这一点。我们展示了如何利用某些辅助函数求解非线性积分方程的有限集来对形状因子求和。 XX 模型的情况得到了更详细的计算,从而产生了动态横向两点函数的新颖的形状因子级数表示。
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.
DOI: 10.1088/1742-5468/2014/04/p04012
发表时间: 2014
期刊: Journal of Statistical Mechanics: Theory and Experiment
影响因子: --
作者:
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期刊: Journal of Statistical Mechanics: Theory and Experiment
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