Antiferromagnetism-altered plasmon dynamics
Abstract
The interaction between plasmons and magnons is a long-sought phenomenon with implications for fundamental physics and spintronics applications. In three-dimensional systems, this coupling is suppressed by the large mismatch in energy scales, but two-dimensional (2D) plasmons with gapless dispersion can overlap with magnons over a broad spectral range. Despite numerous theoretical predictions, experimental observation of magnon-plasmon interaction has remained elusive. In this work, we study a first-of-its-kind hybrid plasmon-magnon platform based on 2D materials. By deploying scattering-type scanning near-field optical microscopy (s-SNOM) with terahertz radiation, we image propagating plasmon wavepackets at a graphene/NiPS3 interface and track their dynamics across the antiferromagnetic transition of NiPS3. We observe a clear renormalization of the plasmon-polariton dispersion concurrent with the onset of antiferromagnetic order. With complementary Raman scattering and nano-terahertz spectroscopy, we unveil spectral weight redistribution and dielectric screening changes, potentially associated with the multi-magnon continuum, as the underlying mechanism. These results provide solid evidence of coupling between plasmon and antiferromagnetic order, marking a cornerstone for a potential platform for hybrid magnon-plasmon interactions in 2D materials, opening avenues for coherent spin-plasmon devices and tunable terahertz spintronic components.
Related
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BibTeX
@misc{su2026antiferromagnetismaltered,
title = {{Antiferromagnetism-altered plasmon dynamics}},
author = {Yifan Su and Suheng Xu and Rocco A. Vitalone and Ziyu Liu and Emil Viñas Boström and Na Wu and Chun-Ying Huang and Zhuquan Zhang and Jaehoon Jung and Daniel G. Chica and Vinícius da Silveira Lan Avelar and Yiping Wang and Takashi Taniguchi and Kenji Watanabe and James C. Hone and Xiaoyang Zhu and Cory R. Dean and Xavier Roy and Angel Rubio and D. N. Basov},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.03138},
eprint = {2609.03138},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.03138},
}
RIS
TY - UNPB
TI - Antiferromagnetism-altered plasmon dynamics
AU - Yifan Su
AU - Suheng Xu
AU - Rocco A. Vitalone
AU - Ziyu Liu
AU - Emil Viñas Boström
AU - Na Wu
AU - Chun-Ying Huang
AU - Zhuquan Zhang
AU - Jaehoon Jung
AU - Daniel G. Chica
AU - Vinícius da Silveira Lan Avelar
AU - Yiping Wang
AU - Takashi Taniguchi
AU - Kenji Watanabe
AU - James C. Hone
AU - Xiaoyang Zhu
AU - Cory R. Dean
AU - Xavier Roy
AU - Angel Rubio
AU - D. N. Basov
PY - 2026
DA - 2026/09/02
PB - arXiv
DO - 10.48550/arxiv.2609.03138
UR - https://arxiv.org/abs/2609.03138
AB - The interaction between plasmons and magnons is a long-sought phenomenon with implications for fundamental physics and spintronics applications. In three-dimensional systems, this coupling is suppressed by the large mismatch in energy scales, but two-dimensional (2D) plasmons with gapless dispersion can overlap with magnons over a broad spectral range. Despite numerous theoretical predictions, experimental observation of magnon-plasmon interaction has remained elusive. In this work, we study a first-of-its-kind hybrid plasmon-magnon platform based on 2D materials. By deploying scattering-type scanning near-field optical microscopy (s-SNOM) with terahertz radiation, we image propagating plasmon wavepackets at a graphene/NiPS_3 interface and track their dynamics across the antiferromagnetic transition of NiPS_3. We observe a clear renormalization of the plasmon-polariton dispersion concurrent with the onset of antiferromagnetic order. With complementary Raman scattering and nano-terahertz spectroscopy, we unveil spectral weight redistribution and dielectric screening changes, potentially associated with the multi-magnon continuum, as the underlying mechanism. These results provide solid evidence of coupling between plasmon and antiferromagnetic order, marking a cornerstone for a potential platform for hybrid magnon-plasmon interactions in 2D materials, opening avenues for coherent spin-plasmon devices and tunable terahertz spintronic components.
ER -