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arXiv 2107.07710cond-mat.dis-nnquant-ph
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耦合到小热库的多体局域化系统的稳定性与动力学

Stability and Dynamics of Many-Body Localized Systems Coupled to Small Bath

Shao-Hen Chiew, Jiangbin Gong, Leong-Chuan Kwek, Chee-Kong Lee

AI总结:

本文通过数值研究耦合到有限环境的无序海森堡自旋链,发现多数情况下系统仍保持局域化,但在梯形构型强耦合时最终局域化性质高度依赖初始状态,可导致热化或局域化。

摘要:

已知封闭量子系统中的强无序会导致多体局域化(MBL),并且这种量子相可以通过耦合到无限大的马尔可夫环境而被破坏。然而,当系统与环境具有有限且可比较的尺寸时,MBL相的稳定性尚不清楚。在这里,我们研究耦合到有限环境的无序海森堡自旋链的稳定性和最终局域化性质,并广泛探索环境无序、几何构型、初始状态和系统-热库耦合强度的影响。通过研究不同初始状态的非平衡动力学和最终稳态性质,我们的数值结果表明,在大多数情况下,尽管耦合到有限环境,系统仍保持其局域化性质,尽管程度有所降低。然而,在系统与环境以梯形构型强耦合的情况下,最终局域化性质高度依赖于初始状态,并可能导致热化或局域化。

英文摘要:

It is known that strong disorder in closed quantum systems leads to many-body localization (MBL), and that this quantum phase can be destroyed by coupling to an infinitely large Markovian environment. However, the stability of the MBL phase is less clear when the system and environment are of finite and comparable size. Here, we study the stability and eventual localization properties of a disordered Heisenberg spin chain coupled to a finite environment, and extensively explore the effects of environment disorder, geometry, initial state and system-bath coupling strength. By studying the non-equilibrium dynamics and the eventual steady-state properties of different initial states, our numerical results indicate that in most cases, the system retains its localization properties despite the coupling to the finite environment, albeit to a reduced extent. However, in cases where the system and environment is strongly coupled in the ladder configuration, the eventual localization properties are highly dependent on the initial state, and could lead to either thermalization or localization.

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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