Probing Quantum Anomalous Hall Transport Under Microwave Irradiation Using a Topological Circulator
Abstract
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.
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BibTeX
@misc{ashok2026probing,
title = {{Probing Quantum Anomalous Hall Transport Under Microwave Irradiation Using a Topological Circulator}},
author = {Athul Ashok and Frank Jin and Nick Du and Luis A. Martinez and Jenny Zhou and Sean O'Kelley and Zachary J. -R. Espley and Gang Qiu and Kang L. Wang and Dong-Xia Qu},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.06245},
eprint = {2610.06245},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.06245},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Probing Quantum Anomalous Hall Transport Under Microwave Irradiation Using a Topological Circulator
AU - Athul Ashok
AU - Frank Jin
AU - Nick Du
AU - Luis A. Martinez
AU - Jenny Zhou
AU - Sean O'Kelley
AU - Zachary J. -R. Espley
AU - Gang Qiu
AU - Kang L. Wang
AU - Dong-Xia Qu
PY - 2026
DA - 2026/10/05
PB - arXiv
DO - 10.48550/arxiv.2610.06245
UR - https://arxiv.org/abs/2610.06245
AB - 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.
ER -