非厄米微波光子超分子中异常点附近的损耗恢复双稳态态
Loss revives bistable state near the exceptional point in a non-Hermitian microwave photonic meta-molecule
摘要：
通过对非厄米系统中例外点的特殊性质的研究，证明了损耗在控制双稳态中的建设性作用。我们在实验上实现了非厄米耦合谐振腔的超分子在微波波段的电脉冲。通过增加损耗，我们首先观察到弱耗散区的双稳态态抑制，然后观察到强耗散区的双稳态态恢复。实验和理论分析都表明，尽管损耗增加，但双稳态的恢复是由于系统遇到EP后场强的恢复。我们的研究结果提供了一种控制和显示双稳态系统的替代方法，从而实现灵活的光子器件，而不仅限于微波制度。
英文摘要：
By exploring the extraordinary property of exceptional points (EPs) in non-Hermitian systems, we here demonstrate that losses can play constructive roles in controlling bistable states. We experimentally realize the EP in a non-Hermitian meta-molecule of coupled resonators in microwave regime. By increasing the loss, we first observe the bistable state suppression at the weak-dissipative regime, but then the bistable state recovery in strong-dissipative regime. Both the experimental and theoretical analysis demonstrate that the revival of bistable states results from the revival of the field intensity after the system encounters EPs, in spite of the increasing loss. Our results provide an alternative way to controlling and manifesting bistable systems, so as to achieve flexible photonic devices, not limited to the microwave regime.
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