论文标题

拓扑边缘模式无对称性旋转链中的旋转链

Topological edge modes without symmetry in quasiperiodically driven spin chains

论文作者

Friedman, Aaron J., Ware, Brayden, Vasseur, Romain, Potter, Andrew C.

论文摘要

我们构建了一个1 $ d $ quasiperiodionder驱动的自旋链的示例,其边缘状态可以连贯地存储量子信息,并通过本地化,动力学和拓扑结合进行保护。与静态和定期驱动(Floquet)旋转链中的类似行为不同,该模型不依赖显微镜对称性保护:相反,边缘状态纯粹是由新兴的动力对称性保护的。我们通过精确的数字,时间不断发展的块分解和分析性高频扩展探索了这种新兴动力对称性对称性保护拓扑(EDSPT)顺序的动力学签名,发现EDSPT是一个稳定的动力学阶段,表明由散装多体性稳定的稳定的动力学阶段(至少超出了(至少)超出了(至少)的长期尺度,并且可能超出了(至少)。我们认为,EDSPTs对于二齿驱动的设置很特别,在Floquet Systems中不能出现。此外,我们发现了一种新型的边界关键性的证据,其中边缘自旋动力学从准二元到混乱,导致散装热化。

We construct an example of a 1$d$ quasiperiodically driven spin chain whose edge states can coherently store quantum information, protected by a combination of localization, dynamics, and topology. Unlike analogous behavior in static and periodically driven (Floquet) spin chains, this model does not rely upon microscopic symmetry protection: Instead, the edge states are protected purely by emergent dynamical symmetries. We explore the dynamical signatures of this Emergent Dynamical Symmetry-Protected Topological (EDSPT) order through exact numerics, time evolving block decimation, and analytic high-frequency expansion, finding evidence that the EDSPT is a stable dynamical phase protected by bulk many-body localization up to (at least) stretched-exponentially long time scales, and possibly beyond. We argue that EDSPTs are special to the quasiperiodically driven setting, and cannot arise in Floquet systems. Moreover, we find evidence of a new type of boundary criticality, in which the edge spin dynamics transition from quasiperiodic to chaotic, leading to bulk thermalization.

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