Robust Scattered Fields from Adiabatically Driven Targets around Exceptional Points
Robust Scattered Fields from Adiabatically Driven Targets around Exceptional Points
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DOI：
10.1103/physrevlett.124.133905
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发表时间：
2020-04-02
影响因子：
8.6
通讯作者：
Kottos, Tsampikos
中科院分区：
文献类型：
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作者：
Fernandez-Alcazar, Lucas J.;Li, Huanan;Kottos, Tsampikos
散射过程通常对入射波特性和通过与目标的波-物质相互作用产生的干扰效应敏感。我们挑战这种普遍的信念，在目标的情况下，经历时间周期调制包围一个例外点在给定的参数空间的准绝热。当散射停留时间高于临界值tau(c)时，散射场对入射波的性质和驱动的局部操作细节令人惊讶地不敏感。相反，它会到达一个固定点吸引子，这个固定点吸引子可以由驱动循环的方向来控制。对于低于tau(c)的停留时间，不寻常的鲁棒性突然被抑制。这些协议可能成为控制工程中的有用工具，包括热和量子波动的管理。
Scattering processes are typically sensitive to the incident wave properties and to interference effects generated via wave-matter interactions with the target. We challenge this general belief in the case of targets that undergo time-periodic modulations encircling quasiadiabatically an exceptional point in a given parameter space. When the scattering dwell time is above a critical value tau(c), the scattered field is surprisingly insensitive to the properties of the incoming wave and local operational details of the driving. Instead, it reaches a fixed point attractor that can be controlled by the direction of the driving cycle. For dwell times below tau(c), the unusual robustness is abruptly suppressed. Such protocols may become useful tools in control engineering, including the management of thermal and quantum fluctuations.