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arXiv 2301.08438cond-mat.str-elcond-mat.stat-mech
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具有长程相互作用的 $\mathbb{Z}_{3}$ 对称自旋链的量子临界性

Quantum criticality of a $\mathbb{Z}_{3}$ symmetric spin chain with long-range interactions

Xue-Jia Yu, Chengxiang Ding, Limei Xu

AI总结:

本文利用密度矩阵重整化群和保真度磁化率,系统研究了长程相互作用量子三态Potts链的临界行为,首次通过非微扰数值方法确定长程相互作用幂次临界阈值约为1.43,并揭示系统分属长程与短程两个普适类。

摘要:

基于大规模密度矩阵重整化群技术,我们研究了具有长程相互作用的量子三态Potts链的临界行为。利用保真度磁化率作为指标,我们得到了该系统的完整相图。结果表明,随着长程相互作用幂次 $α$ 的增大,临界点 $f_{c}^{*}$ 向更低值移动。此外,首次通过非微扰数值方法获得了长程相互作用幂次的临界阈值 $α_{c}(\approx 1.43)$。这表明系统的临界行为可以自然地划分为两个不同的普适类,即长程($α\textless α_c$)和短程($α\textgreater α_c$)普适类,与经典 $ϕ^{3}$ 有效场论定性一致。该工作为进一步研究具有长程相互作用的量子自旋链中的相变提供了有益的参考。

英文摘要:

Based on large-scale density matrix renormalization group techniques, we investigate the critical behaviors of quantum three-state Potts chains with long-range interactions. Using fidelity susceptibility as an indicator, we obtain a complete phase diagram of the system. The results show that as the long-range interaction power $α$ increases, the critical points $f_{c}^{*}$ shift towards lower values. In addition, the critical threshold $α_{c}(\approx 1.43$) of the long-range interaction power is obtained for the first time by a non-perturbative numerical method. This indicates that the critical behavior of the system can be naturally divided into two distinct universality classes, namely the long-range ($α\textless α_c$) and short-range ($α\textgreater α_c$) universality classes, qualitatively consistent with the classical $ϕ^{3}$ effective field theory. This work provides a useful reference for further research on phase transitions in quantum spin chains with long-range interaction.

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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