Nonthermal dynamics in a spin- 12 lattice Schwinger model
Nonthermal dynamics in a spin- 12 lattice Schwinger model
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DOI：
10.1103/physrevb.107.104302
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发表时间：
2023-01
影响因子：
3.7
通讯作者：
Chunping Gao;Zheng Tang;F. Zhu;Yunbo Zhang;H. Pu;Li Chen
中科院分区：
文献类型：
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作者：
Chunping Gao;Zheng Tang;F. Zhu;Yunbo Zhang;H. Pu;Li Chen
局域规范对称性是研究量子热化破缺的一个有趣的方面。例如，在高自旋格点Schwinger模型（LSM）中，局域U（1）规范对称性是物质场无无序多体局域化（MBL）动力学的基础。然而，由于哈密顿量中没有电能，这种机制在自旋为1/2的LSM中不起作用。在本文中，我们表明，自旋1/2 LSM也可以表现出无序的MBL动力学，以及熵预热化，通过引入一个四费米子相互作用到系统中。费米子相互作用和U（1）规范对称性之间的相互作用赋予规范场一个有效的无序势，这是热化破缺的原因。它引起异常（即，非热）行为的长期演化等量的本地观测，纠缠熵，相关函数。我们的工作提供了一个新的平台，探索新兴的非热动力学在国家的最先进的量子模拟器与规范对称性。
Local gauge symmetry is intriguing for the study of quantum thermalization breaking. For example, in the high-spin lattice Schwinger model (LSM), the local U(1) gauge symmetry underlies the disorder-free many-body localization (MBL) dynamics of matter fields. This mechanism, however, would not work in a spin-1/2 LSM due to the absence of electric energy in the Hamiltonian. In this paper, we show that the spin-1/2 LSM can also exhibit disorder-free MBL dynamics, as well as entropy prethermalization, by introducing a four-fermion interaction into the system. The interplay between the fermion interaction and U(1) gauge symmetry endows the gauge fields with an effectively disordered potential which is responsible for the thermalization breaking. It induces anomalous (i.e., non-thermal) behaviors in the long-time evolution of such quantities as local observables, entanglement entropy, and correlation functions. Our work offers a new platform to explore emergent non-thermal dynamics in state-of-the-art quantum simulators with gauge symmetries.