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arXiv math-ph/0211003math-phhep-thmath.MPnlin.SI
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精确可解的离散BCS型Hamilton算子和六顶点模型

Exactly solvable discrete BCS - type Hamiltonians and the Six-Vertex model

A. A. Ovchinnikov

摘要:

我们提出了新的家庭的精确可解的离散状态BCS型哈密顿量的基础上,它的关系,六顶点模型在准经典极限在理性和三角的情况下。建立了BCS哈密顿量及其本征函数与F-基上的单值矩阵形式之间的关系。对等耦合的标准BCS模型采用代数Bethe Answer方法,得到了有限个点的广义标积表达式和物理上有趣的关联函数的行列式表达式,可用于数值和解析计算。我们还比较了通过变分方法得到的结果的分解。

英文摘要:

We propose the new family of the exactly solvable discrete state BCS - type Hamiltonians based on its relationship to the six-vertex model in the quasiclassical limit both in the rational and the trigonometric cases. We establish the relation of the BCS Hamiltonian and its eigenfunctions to the form of the monodromy matrix in the F-basis. Using the Algebraic Bethe Ansatz method for the standard BCS model with equal coupling the expression for the general scalar product and the determinant expressions for the physically interesting correlation functions for the finite number of sites which can be used in the numerical and analytical computations are obtained. We also compare the correlators with the results obtained by means of the variational method.

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