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arXiv 2302.12271cond-mat.dis-nn
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准周期驱动量子系统中的动力学局域化与慢动力学

Dynamical localization and slow dynamics in quasiperiodically-driven quantum systems

Vatsana Tiwari, Devendra Singh Bhakuni, Auditya Sharma

AI总结:

本文研究准周期驱动电场对一维无序费米子链的影响,发现准周期驱动可诱导动力学局域化、破坏安德森局域化并导致对数弛豫,揭示了其与周期驱动模型截然不同的慢动力学行为。

摘要:

我们研究了一维无序费米子链中准周期驱动电场的作用。在干净的无相互作用情形下,我们展示了动力学局域化的出现——这一现象此前已知仅存在于完美周期驱动中。相比之下,在存在无序的情形下,周期驱动保持安德森局域化,而我们表明准周期驱动会破坏安德森局域化并导致缓慢弛豫。考虑相互作用的作用,我们揭示了准周期驱动诱导的对数弛豫现象,其中适当调谐的驱动(对应于干净无相互作用极限下的动力学局域化)即使在无序足够小、系统处于遍历相的情况下也会减慢动力学。这与未驱动模型中观察到的快速弛豫以及周期驱动模型表现出的热化缺失(驱动诱导的多体局域化)形成鲜明对比。

英文摘要:

We investigate the role of a quasiperiodically driven electric field in a one-dimensional disordered fermionic chain. In the clean non-interacting case, we show the emergence of dynamical localization - a phenomenon previously known to exist only for a perfect periodic drive. In contrast, in the presence of disorder, where a periodic drive preserves Anderson localization, we show that the quasiperiodic drive destroys it and leads to slow relaxation. Considering the role of interactions, we uncover the phenomenon of quasiperiodic driving-induced logarithmic relaxation, where a suitably tuned drive (corresponding to dynamical localization in the clean, non-interacting limit) slows down the dynamics even when the disorder is small enough for the system to be in the ergodic phase. This is in sharp contrast to the fast relaxation seen in the undriven model, as well as the absence of thermalization (drive-induced MBL) exhibited by a periodically driven model.

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