arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1412.4752cond-mat.dis-nncond-mat.stat-mechcond-mat.str-el
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周期驱动系统中的多体局域化理论

A theory of many-body localization in periodically driven systems

Dmitry Abanin, Wojciech De Roeck, François Huveneers

摘要:

我们提出了一个理论的周期性驱动,多体局域化(MBL)系统。我们认为MBL在足够高的驱动频率下持续存在:Floquet算子(在一个驱动周期内的演化算子)可以表示为一个有效的与时间无关的哈密顿量的指数,这是一个准局域项的总和,本身就是完全MBL。我们通过构造一系列正则变换来消除原始哈密顿量的时间依赖性,从而得出这个结果。当驱动力随时间平稳演化时,可以通过估计多体能级交叉处绝热朗道-齐纳跃迁的概率来改进理论。在所有情况下,我们认为,有足够低的频率离域。我们提出了一个驱动MBL系统的相图。

英文摘要:

We present a theory of periodically driven, many-body localized (MBL) systems. We argue that MBL persists under periodic driving at high enough driving frequency: The Floquet operator (evolution operator over one driving period) can be represented as an exponential of an effective time-independent Hamiltonian, which is a sum of quasi-local terms and is itself fully MBL. We derive this result by constructing a sequence of canonical transformations to remove the time-dependence from the original Hamiltonian. When the driving evolves smoothly in time, the theory can be sharpened by estimating the probability of adiabatic Landau-Zener transitions at many-body level crossings. In all cases, we argue that there is delocalization at sufficiently low frequency. We propose a phase diagram of driven MBL systems.

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