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arXiv 0912.4466cond-mat.stat-mechmath-phmath.MPnlin.SI
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有限量子XY链的形状因子

Form-factors of the finite quantum XY-chain

Nikolai Iorgov

摘要:

导出了横场中有限量子周期XY链哈密顿量本征矢之间自旋算符σ^x和σ^y的矩阵元(形状因子)的显式因式分解公式.推导是基于三种模型:量子XY链模型、二维格点上的伊辛模型和N=2的Bazhanov-Stroganov τ^{(2)}模型之间的关系。由于这些关系,我们把最近用分离变量法得到的后一模型的形状因子公式转移到量子XY链模型中。这些形状因子的计算公式可望对有限温度下多点动态关联函数的分析有所帮助。作为一个例子,我们在不使用Toeplitz行列式和Wiener-Hopf分解方法的情况下,重新推导了无序相两点关联函数的渐近性质.

英文摘要:

Explicit factorized formulas for the matrix elements (form-factors) of the spin operators σ^x and σ^y between the eigenvectors of the Hamiltonian of the finite quantum periodic XY-chain in a transverse field were derived. The derivation is based on the relations between three models: the model of quantum XY-chain, Ising model on 2D lattice and N=2 Baxter-Bazhanov-Stroganov τ^{(2)}-model. Due to these relations we transfer the formulas for the form-factors of the latter model recently obtained by the use of separation of variables method to the model of quantum XY-chain. Hopefully, the formulas for the form-factors will help in analysis of multipoint dynamic correlation functions at a finite temperature. As an example, we re-derive the asymptotics of two-point correlation function in the disordered phase without the use of the Toeplitz determinants and the Wiener-Hopf factorization method.

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