arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2408.09684quant-phcond-mat.stat-mechcond-mat.str-elmath.CO
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自由parafermion可解性的图论框架

A Graph-Theoretic Framework for Free-Parafermion Solvability

Ryan L. Mann, Samuel J. Elman, David R. Wood, Adrian Chapman

AI总结:

本文提出图论框架,通过挫折图刻画量子自旋模型可映射为自由parafermion的精确可解条件,并给出高效判定算法,推广了自由fermion情形,并应用于三个qudit模型。

摘要:

我们提出了一个图论刻画,用于判定量子自旋模型何时通过映射到自由parafermion而具有精确解。我们的刻画基于挫折图(frustration graph)的概念,该图表示哈密顿量的Weyl算子之间的对易关系。我们证明,如果一个量子自旋系统的挫折图是有向无差异图(oriented indifference graph),则该系统具有精确的自由parafermion解。进一步,我们证明,如果模型的挫折图可以通过切换操作进行有向路径定向,则该模型是可积的,即存在一族对易的独立集电荷。此外,我们建立了一个高效算法来判断这种定向是否可行。我们的刻画推广了自由fermion可解性的已有刻画。最后,我们将结果应用于求解三个qudit自旋模型。

英文摘要:

We present a graph-theoretic characterisation of when a quantum spin model admits an exact solution via a mapping to free parafermions. Our characterisation is based on the concept of a frustration graph, which represents the commutation relations between Weyl operators of a Hamiltonian. We show that a quantum spin system has an exact free-parafermion solution if its frustration graph is an oriented indifference graph. Further, we show that if the frustration graph of a model can be dipath oriented via switching operations, then the model is integrable in the sense that there is a family of commuting independent set charges. Additionally, we establish an efficient algorithm for deciding whether this is possible. Our characterisation extends that given for free-fermion solvability. Finally, we apply our results to solve three qudit spin models.

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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