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Thouless pumping in disordered photonic systems
Light: Science & Applications ( IF 19.4 ) Pub Date : 2020-10-19 , DOI: 10.1038/s41377-020-00408-2
Alexander Cerjan , Mohan Wang , Sheng Huang , Kevin P. Chen , Mikael C. Rechtsman

Thouless charge pumping protocols provide a route for one-dimensional systems to realize topological transport. Here, using arrays of evanescently coupled optical waveguides, we experimentally demonstrate bulk Thouless pumping in the presence of disorder. The degree of pumping is quite tolerant to significant deviations from adiabaticity as well as the addition of system disorder until the disorder is sufficiently strong to reduce the bulk mobility gap of the system to be on the scale of the modulation frequency of the system. Moreover, we show that this approach realizes near-full-unit-cell transport per pump cycle for a physically relevant class of localized initial system excitations. Thus, temporally pumped systems can potentially be used as a design principle for a new class of modulated slow-light devices that are resistant to system disorder.



中文翻译:

无序光子系统中的无用泵浦

几乎没有电荷泵送协议为一维系统提供了实现拓扑传输的途径。在这里,我们使用渐逝耦合的光波导阵列,通过实验证明了在无序情况下的整体Thouless泵浦。抽运程度对绝热性的显着偏差以及系统无序性的增加是相当宽容的,直到该无序性足够强到足以减小系统的整体迁移率间隙以达到系统的调制频率的程度为止。而且,我们表明,对于本地初始系统激励的物理相关类,此方法实现了每个泵周期的近全单元运输。从而,

更新日期:2020-10-19
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