Magnetic control of reflectionless states and an intrinsic-mode exceptional point in a magnon-phonon coupling system
Abstract
Reflectionless states (RLs) and exceptional points (EPs) are hallmark singular responses of non-Hermitian systems, with potential applications in sensing, wave control, and energy manipulation. Yet, realizing and independently tuning these states in a compact integrated platform remains challenging. Here, we demonstrate two-dimensional magnetic control of RLs and EPs in an on-chip magnon-phonon system based on a FeGaB-32 degree-YX-LiNbO3 heterostructure. The magnetic-field magnitude tunes the magnon-phonon detuning, driving a low-loss reflection zero across the real-frequency axis and producing two field-tunable RLs with near-vanishing reflection. A closed contour of the experimentally measured complex S11 around the reflection-zero singularity accumulates a -2pi phase winding. Independently, rotating the magnetic field tunes the magnon-phonon coupling strength, driving the intrinsic magnon-phonon eigenmode spectrum across an exceptional point, identified by the exchange between real-part and imaginary-part eigenvalue splitting. A unified one-port input-output model connects the measured complex S11 response to the field-driven dynamics of the reflection zeros and the angle-tuned intrinsic magnon-phonon eigenmodes. These results establish a magnetically programmable non-Hermitian magnon-phonon platform for integrated wave control and compact vector magnetic sensing.
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BibTeX
@misc{ma2026magnetic,
title = {{Magnetic control of reflectionless states and an intrinsic-mode exceptional point in a magnon-phonon coupling system}},
author = {Mingyuan Ma and Jiongjie Wang and Chong Chen and Weiqi Du and Liyang Liao and Yanzhang Cao and Peisen Liu and Boyuan Xiao and Deqi Tao and Shixuan Liang and Sulei Fu and Jiang Xiao and Cheng Song and Feng Pan},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.41851},
eprint = {2610.41851},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.41851},
note = {CC BY-NC-SA 4.0},
}
RIS
TY - UNPB
TI - Magnetic control of reflectionless states and an intrinsic-mode exceptional point in a magnon-phonon coupling system
AU - Mingyuan Ma
AU - Jiongjie Wang
AU - Chong Chen
AU - Weiqi Du
AU - Liyang Liao
AU - Yanzhang Cao
AU - Peisen Liu
AU - Boyuan Xiao
AU - Deqi Tao
AU - Shixuan Liang
AU - Sulei Fu
AU - Jiang Xiao
AU - Cheng Song
AU - Feng Pan
PY - 2026
DA - 2026/10/30
PB - arXiv
DO - 10.48550/arxiv.2610.41851
UR - https://arxiv.org/abs/2610.41851
AB - Reflectionless states (RLs) and exceptional points (EPs) are hallmark singular responses of non-Hermitian systems, with potential applications in sensing, wave control, and energy manipulation. Yet, realizing and independently tuning these states in a compact integrated platform remains challenging. Here, we demonstrate two-dimensional magnetic control of RLs and EPs in an on-chip magnon-phonon system based on a FeGaB-32 degree-YX-LiNbO3 heterostructure. The magnetic-field magnitude tunes the magnon-phonon detuning, driving a low-loss reflection zero across the real-frequency axis and producing two field-tunable RLs with near-vanishing reflection. A closed contour of the experimentally measured complex S11 around the reflection-zero singularity accumulates a -2pi phase winding. Independently, rotating the magnetic field tunes the magnon-phonon coupling strength, driving the intrinsic magnon-phonon eigenmode spectrum across an exceptional point, identified by the exchange between real-part and imaginary-part eigenvalue splitting. A unified one-port input-output model connects the measured complex S11 response to the field-driven dynamics of the reflection zeros and the angle-tuned intrinsic magnon-phonon eigenmodes. These results establish a magnetically programmable non-Hermitian magnon-phonon platform for integrated wave control and compact vector magnetic sensing.
ER -