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arXiv 1003.4557math-phcond-mat.stat-mechhep-thmath.MPnlin.SI
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无质量XXZ Heisenberg链中粒子-空穴形状因子的热力学极限

Thermodynamic limit of particle-hole form factors in the massless XXZ Heisenberg chain

N. Kitanine, K. K. Kozlowski, J. M. Maillet, N. A. Slavnov, V. Terras

摘要:

研究了XXZ海森堡链在无质量状态下粒子-空穴形状因子的热力学极限。我们表明,在这个限制,这样的形状因子减少作为一个明确计算的系统大小的幂律。此外,相应的振幅可以作为“光滑”和“离散”部分的产物获得:前者连续地依赖于粒子和空穴的快速性,而后者则对相关对数贝特方程中标记每个激发态的整数集有额外的显式依赖性。我们还表明,特殊的形状因子对应于零能量激发躺在费米表面上的系统尺寸的幂律减少与相同的临界指数在长距离渐近行为的相关的两点关联函数。本文所发展的方法具有一定的普遍性,并可应用于其它与六顶点R矩阵相关的、具有形状因子的行列式表示的无质量可积模型。

英文摘要:

We study the thermodynamic limit of the particle-hole form factors of the XXZ Heisenberg chain in the massless regime. We show that, in this limit, such form factors decrease as an explicitly computed power-law in the system-size. Moreover, the corresponding amplitudes can be obtained as a product of a "smooth" and a "discrete" part: the former depends continuously on the rapidities of the particles and holes, whereas the latter has an additional explicit dependence on the set of integer numbers that label each excited state in the associated logarithmic Bethe equations. We also show that special form factors corresponding to zero-energy excitations lying on the Fermi surface decrease as a power-law in the system size with the same critical exponents as in the long-distance asymptotic behavior of the related two-point correlation functions. The methods we develop in this article are rather general and can be applied to other massless integrable models associated to the six-vertex R-matrix and having determinant representations for their form factors.

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