发表机构
Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo; Lawrence Livermore National Laboratory; Department of Electrical and Computer Engineering, University of Minnesota; Department of Electrical and Computer Engineering, University of California, Los Angeles（滑铁卢大学量子计算研究所与物理天文学系; 劳伦斯利弗莫尔国家实验室; 明尼苏达大学电气与计算机工程系; 加州大学洛杉矶分校电气与计算机工程系）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究利用量子反常霍尔拓扑环行器，通过泵浦-探测实验发现微波辐照对边缘磁等离子体激元输运产生频率选择性扰动，并在奇异点附近实现增强的微波响应，为微波光谱学与传感提供了新平台。
AI 中文摘要
边缘磁等离子体激元（EMPs）为探测拓扑量子材料中的手性电荷动力学和非互易微波输运提供了平台。然而，检测EMPs传播中的微小扰动仍然具有挑战性，因为它们在传统微波散射测量中的信号可能很弱。在此，我们利用量子反常霍尔拓扑环行器研究微波光子诱导的EMPs输运扰动。泵浦-探测测量揭示了一个强频率选择性响应：虽然微波辐照在多个泵浦频率下显著改变了EMPs的透射，但在选定频率（包括4 GHz和7 GHz）下透射几乎保持不变。我们进一步利用耦合EMPs-谐振器系统的非厄米模式杂化来探测奇异点（EP）附近的响应。EP附近泵浦诱导的透射幅度变化约为远离EP处观测到的两倍，展示了对扰动的增强微波响应。这些结果揭示了手性EMPs输运、微波光子诱导扰动和非厄米动力学之间的相互作用，并展示了拓扑环行器作为增强微波光谱学和传感的有前景平台的潜力。
英文摘要
Edge magnetoplasmons (EMPs) provide a platform for probing chiral charge dynamics and nonreciprocal microwave transport in topological quantum materials. However, detecting small perturbations to EMP propagation remains challenging because their signatures in conventional microwave scattering measurements can be weak. Here, we investigate microwave-photon-induced perturbations of EMP transport using a quantum anomalous Hall topological circulator. Pump--probe measurements reveal a strongly frequency-selective response: while microwave irradiation substantially modifies the EMP transmission at several pump frequencies, the transmission remains nearly unchanged at selected frequencies, including 4 and 7 GHz. We further exploit the non-Hermitian mode hybridization of the coupled EMP-resonator system to probe the response near an exceptional point (EP). The pump-induced change in transmission magnitude near the EP is approximately twice that observed away from the EP, demonstrating an enhanced microwave response to perturbations. These results reveal the interplay among chiral EMP transport, microwave-photon-induced perturbations, and non-Hermitian dynamics, and demonstrate the potential of topological circulators as a promising platform for enhanced microwave spectroscopy and sensing.
