论文标题
一维脱合量子临界点的动态特征
Dynamical signatures of the one-dimensional deconfined quantum critical point
论文作者
论文摘要
我们通过使用无限基质产物的时间演变来研究在两个不同的解剖量子临界点（DQCP）处分数化激发的临界缩放率和动力学特征。相关函数的缩放和保守电流相关的分散明确显示了这些DQCPS上增强的连续对称性的出现。在多个不同通道中的动力结构因子揭示了DQCPS上解剖分数激发的发展。此外，我们发现在铁磁（FM）和价键固体（VBS）阶段之间的DQCP处有有效的自旋荷兰分离，并识别了与$ x $ -Direction和$ z $ Z $ -DIRECTICT FM相之间DQCP不同类型的分数激发相关的两个连续性。我们的发现不仅为DQCP提供了直接的证据，而且还阐明了在较高维度上探索DQCP的探索。
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.
