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arXiv 2006.01922math-phcond-mat.stat-mechhep-thmath.MP
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具有δ函数奇异性的Toeplitz行列式的渐近性

Asymptotic behavior of Toeplitz determinants with a delta function singularity

Vanja Marić, Fabio Franchini

摘要:

我们发现的渐近行为的Toeplitz行列式的符号是两个贡献的总和:一个分析和非零的功能在一个环周围的单位圆,和其他成比例的狄拉克δ函数。利用Wiener-Hopf方法得到了这些公式。在计算某些可积模型的低位激发态中的自旋关联函数时发现了这种类型的行列式,其中δ函数代表激发动量处的峰值。作为应用结果的一个具体例子,利用导出的渐近公式计算了零场中受抑量子XY链最低能带的自旋关联函数和基态磁化强度.

英文摘要:

We find the asymptotic behaviors of Toeplitz determinants with symbols which are a sum of two contributions: one analytical and non-zero function in an annulus around the unit circle, and the other proportional to a Dirac delta function. The formulas are found by using the Wiener-Hopf procedure. The determinants of this type are found in computing the spin-correlation functions in low-lying excited states of some integrable models, where the delta function represents a peak at the momentum of the excitation. As a concrete example of applications of our results, using the derived asymptotic formulas we compute the spin-correlation functions in the lowest energy band of the frustrated quantum XY chain in zero field, and the ground state magnetization.

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