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arXiv 2202.13375cond-mat.str-el
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一维非限定量子临界点的动力学特征

Dynamical signatures of the one-dimensional deconfined quantum critical point

Ning Xi, Rong Yu

摘要:

利用无限矩阵乘积态的时间演化理论研究了$S = 1/2$自旋链中两个不同的去限制量子临界点(DQCP)处的分数激发的临界标度和动力学特征.的关联函数和守恒电流相关性的分散体的缩放明确显示在这些DQCP增强的连续对称性的出现。几个不同通道的动力学结构因子揭示了DQCP中去精细分数激发的发展。此外,我们发现一个有效的自旋-电荷分离在DQCP之间的铁磁(FM)和价键固体(VBS)的阶段,并确定两个连续关联到不同类型的分馏激发在DQCP之间的$X$ -方向和$Z$ -方向FM阶段。我们的发现不仅为一维DQCP提供了直接证据,而且为更高维度的DQCP探索提供了启示。

英文摘要:

We study the critical scaling and dynamical signatures of fractionalized excitations at two different deconfined quantum critical points (DQCPs) in an $S = 1/2$ spin chain by using the time evolution of infinite matrix product states. The scaling of the correlation functions and the dispersion of the conserved current correlations explicitly show the emergence of enhanced continuous symmetries at these DQCPs. The dynamical structure factors in several different channels reveal the development of deconfined fractionalized excitations at the DQCPs. Furthermore, we find an effective spin-charge separation at the DQCP between the ferromagnetic (FM) and valence bond solid (VBS) phases, and identify two continua associated to different types of fractionalized excitations at the DQCP between the $X$-direction and $Z$-direction FM phases. Our findings not only provide direct evidence for the DQCP in one dimension but also shed light on exploring the DQCP in higher dimensions.

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