驱动诱导多体定位与斯塔克多体定位的相干破坏

D. S. Bhakuni, Ritu Nehra, Auditya Sharma
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引用次数: 11

摘要

本文研究了直流和交流方波电场联合作用下的多体局部化现象。首先,半经典地得到了动态局域化、wanner - stark局域化的相干破坏和非相互作用极限下超Bloch振荡的条件。在存在相互作用(和限制/无序势)的情况下,如果场强足够大,仅静态场就会导致“斯塔克多体定位”。我们发现,在存在额外的高频交流场的情况下,有两种保持MBL完整的方法:要么通过谐振驱动,其中驱动的振幅与频率的比率($A/\omega$)在非相互作用极限的动态局域点进行调谐,要么通过非谐振驱动。值得注意的是,将$A/\omega$调谐到远离动态局域点的共振驱动导致了Stark\emph{-MBL的相干破坏}。此外,如果在零直流场问题的动态局域点调谐$A/\omega$,纯(高频)交流场也可以产生MBL相位。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Drive-induced many-body localization and coherent destruction of Stark many-body localization
We study the phenomenon of many-body localization (MBL) in an interacting system subjected to a combined DC as well as a square wave AC electric field. First, the condition for the dynamical localization, coherent destruction of Wannier-Stark localization and super Bloch oscillations in the non-interacting limit, are obtained semi-classically. In the presence of interactions (and a confining/disordered potential), a static field alone leads to ``Stark many-body localization", for sufficiently large field strengths. We find that in the presence of an additional high-frequency AC field, there are two ways of maintaining the MBL intact: either by resonant drive where the ratio of amplitude to the frequency of the drive ($A/\omega$) is tuned at the dynamical localization point of the non-interacting limit or by off-resonant drive. Remarkably, resonant drive with $A/\omega$ tuned away from the dynamical localization point leads to a \emph{coherent destruction of Stark-MBL}. Moreover, a pure (high-frequency) AC field can also give rise to the MBL phase if $A/\omega$ is tuned at the dynamical localization point of the zero dc field problem.
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