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arXiv 1706.09459math-phcond-mat.stat-mechcond-mat.str-elmath.MPnlin.SI
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XXZ自旋$1/2$链无质量区动力学关联函数形状因子展开的热力学极限

On the thermodynamic limit of form factor expansions of dynamical correlation functions in the massless regime of the XXZ spin $1/2$ chain

K. K. Kozlowski

摘要:

这项工作构建了一个定义良好的和可操作的形状因子扩展模型具有无质量的频谱的激励。更准确地说,在XXZ自旋1/2链的无质量制度的动态两点函数表示在适当的正则化系列的多重积分。这些系列是通过采取适当的方式,有限体积形状因子扩展的热力学极限。该系列的结构的方式,允许一个直接识别的贡献相关器产生的共形型的费米表面上的激发和那些发出的大规模的激发(深洞,粒子和束缚态)。所获得的形状因子系列开辟了一个系统的和精确的研究的渐近制度的动力学关联函数在无质量制度的XXZ自旋$1/2$链的可能性。此外,为了写出这个系列,对模型的希尔伯特空间的微观结构的假设似乎与任何属于Luttinger液体普适类的模型都是兼容的-不一定是可积的。因此,目前的分析也提供了属于这个普适类的无质量模型的形状因子扩展的唯象结构。

英文摘要:

This work constructs a well-defined and operational form factor expansion in a model having a massless spectrum of excitations. More precisely, the dynamic two-point functions in the massless regime of the XXZ spin-1/2 chain are expressed in terms of properly regularised series of multiple integrals. These series are obtained by taking, in an appropriate way, the thermodynamic limit of the finite volume form factor expansions. The series are structured in way allowing one to identify directly the contributions to the correlator stemming from the conformal-type excitations on the Fermi surface and those issuing from the massive excitations (deep holes, particles and bound states). The obtained form factor series opens up the possibility of a systematic and exact study of asymptotic regimes of dynamical correlation functions in the massless regime of the XXZ spin $1/2$ chain. Furthermore, the assumptions on the microscopic structure of the model's Hilbert space that are necessary so as to write down the series appear to be compatible with any model -- not necessarily integrable -- belonging to the Luttinger liquid universality class. Thus, the present analysis provides also the phenomenological structure of form factor expansions in massless models belonging to this universality class.

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