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Anomalous Floquet-Anderson Insulator as a Nonadiabatic Quantized Charge Pump

机译:异常的Floquet-Anderson绝缘子作为非等化量电荷泵

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We show that two-dimensional periodically driven quantum systems with spatial disorder admit a unique topological phase, which we call the anomalous Floquet-Anderson insulator (AFAI). The AFAI is characterized by a quasienergy spectrum featuring chiral edge modes coexisting with a fully localized bulk. Such a spectrum is impossible for a time-independent, local Hamiltonian. These unique characteristics of the AFAI give rise to a new topologically protected nonequilibrium transport phenomenon: quantized, yet nonadiabatic, charge pumping. We identify the topological invariants that distinguish the AFAI from a trivial, fully localized phase, and show that the two phases are separated by a phase transition.
机译:我们展示了具有空间障碍的二维定期驱动量子系统承认我们称之为异常的浮子 - 安德森绝缘体(AFAI)。 AFAI的特点是QuasiEnergy光谱,具有与完全局部化散装共存的手性边缘模式。这种频谱是不合适的,当地的汉密尔顿人不可能的。这些独特的AFAI特征引起了新的拓扑保护非核状运输现象:量化,但不等离电荷泵送。我们确定将AFAI与琐碎,完全局部阶段区分开的拓扑不变性,并表明这两个阶段通过相位过渡分开。

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