arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2105.02449cond-mat.str-el
收藏

相互作用拓扑绝缘体中的关联和动力学量子相变

Correlations and dynamical quantum phase transitions in an interacting topological insulator

Wing Chi Yu, P. D. Sacramento, Yan Chao Li, Hai-Qing Lin

摘要:

动力学量子相变是指量子多体系统在时间上的临界性,近年来引起了理论和实验研究的极大兴趣。尽管DQPT的定义和信号的非解析性的Loschirp率,其相互关系与各种相关措施,如平衡序参量的系统仍然不清楚。在这项工作中,通过考虑淬火动力学在相互作用的拓扑模型,我们发现,平衡序参量的模型一般表现出签名周围的DQPT,在短时间制度。平衡序参量的第一个极值与第一个Loschlavin速率峰相连。通过研究不等时间两点相关性,我们还发现,最近的邻居之间的相关性衰减,而更远的邻居建立在非相互作用的情况下,随着时间的增长,并在增加排斥细胞内的相互作用。另一方面,细胞间的相互作用往往抑制两个网站的相关性。这些发现可以为我们深入了解DQPT周围系统的特性,并为更好地理解非平衡量子多体系统的动力学铺平道路。

英文摘要:

Dynamical quantum phase transitions (DQPTs), which refer to the criticality in time of a quantum many-body system, have attracted much theoretical and experimental research interest recently. Despite DQPTs are defined and signalled by the non-analyticities in the Loschmidt rate, its interrelation with various correlation measures such as the equilibrium order parameters of the system remains unclear. In this work, by considering the quench dynamics in an interacting topological model, we find that the equilibrium order parameters of the model in general exhibit signatures around the DQPT, in the short time regime. The first extrema of the equilibrium order parameters are connected to the first Loschmidt rate peak. By studying the unequal-time two-point correlation, we also find that the correlation between the nearest neighbors decays while that with neighbors further away builds up as time grows in the non-interacting case, and upon the addition of repulsive intra-cell interactions. On the other hand, the inter-cell interaction tends to suppress the two-site correlations. These findings could provide us insights into the characteristic of the system around DQPTs, and pave the way to a better understanding of the dynamics in non-equilibrium quantum many-body systems.

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。

↑