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arXiv 1402.1471cond-mat.stat-mech
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$q$ -提升Néel态与XXZ Bethe态的重叠及其与Lieb-Liniger玻色气体的关系

Overlaps of $q$-raised Néel states with XXZ Bethe states and their relation to the Lieb-Liniger Bose gas

Michael Brockmann

摘要:

我们给出了自旋为1/2的XXZ链在非零磁化扇区中$q$ -提升Néel态与Bethe态重叠的Gaudin行列式表达式.前者是通过对反铁磁伊辛链的基态Néel态应用全局$U_q(sl_2)$自旋提升算符而构造的。所提出的公式是从最近获得的Néel态与XXZ Bethe态重叠的结果导出的。决定子以及它们的前因子可以在XXZ自旋链到Lieb-Liniger玻色气体的标度极限中进行评估。在这个极限之内,一个含有1000个下自旋的$q$提升的内尔态对应于自由玻色子的基态。这允许严格证明任意数量的粒子的BEC Lieb-Liniger重叠公式。

英文摘要:

We present a Gaudin-like determinant expression for overlaps of $q$-raised Néel states with Bethe states of the spin-1/2 XXZ chain in the non-zero magnetization sector. The former is constructed by applying global $U_q(sl_2)$ spin raising operators to the Néel state, the ground state of the antiferromagnetic Ising chain. The formulas presented are derived from recently-obtained results for the overlap of the Néel state with XXZ Bethe states. The determinants as well as their prefactors can be evaluated in the scaling limit of the XXZ spin chain to the Lieb-Liniger Bose gas. Within this limit a $q$-raised Néel state that contains finitely many down spins corresponds to the ground state of free bosons. This allows for a rigorous proof of the BEC Lieb-Liniger overlap formula for an arbitrary number of particles.

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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