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arXiv 1101.4469math-phmath.CAmath.MPquant-ph
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一个与Hahn多项式有关的可精确解自旋链

An Exactly Solvable Spin Chain Related to Hahn Polynomials

Neli I. Stoilova, Joris Van der Jeugt

摘要:

我们研究了Shi等人[Phys.Rev.A71(2005),032309,5页]最初引入的线性自旋链,其中耦合强度包含参数$α$并且取决于链位点的奇偶性。通过引入第二个参数$β$,证明了该模型的哈密顿量的单费米子本征态可以显式计算。这些特征向量的分量是具有参数$(α,β)$和$(α+1,β-1)$的Hahn多项式。特征向量的构造依赖于两个新的Hahn多项式差分方程。本征态的显式知识导致自旋链的关联函数的封闭形式的表达。我们还讨论了这个模型的$q$扩展的一些方面。

英文摘要:

We study a linear spin chain which was originally introduced by Shi et al. [Phys. Rev. A 71 (2005), 032309, 5 pages], for which the coupling strength contains a parameter $α$ and depends on the parity of the chain site. Extending the model by a second parameter $β$, it is shown that the single fermion eigenstates of the Hamiltonian can be computed in explicit form. The components of these eigenvectors turn out to be Hahn polynomials with parameters $(α,β)$ and $(α+1,β-1)$. The construction of the eigenvectors relies on two new difference equations for Hahn polynomials. The explicit knowledge of the eigenstates leads to a closed form expression for the correlation function of the spin chain. We also discuss some aspects of a $q$-extension of this model.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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