Magnon polaritons in a van der Waals ferromagnet coupled to a superconducting resonator
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| Format: | Preprint |
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2026
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| author | Bermejillo-Seco, Alvaro van der Goot, Luuk J. Arfini, Matteo Blanter, Yaroslav M. Steele, Gary A. van der Zant, Herre S. J. |
| author_facet | Bermejillo-Seco, Alvaro van der Goot, Luuk J. Arfini, Matteo Blanter, Yaroslav M. Steele, Gary A. van der Zant, Herre S. J. |
| contents | Achieving magnon-photon hybridization in the microwave regime is essential for integrating magnetic excitations with superconducting circuits. While this has been extensively demonstrated in bulk magnetic systems, realizing it in two-dimensional van der Waals materials remains challenging due to their reduced magnetic volume and increased dissipation. Here, magnon-photon hybridization is observed in exfoliated flakes of the van der Waals ferromagnet Cr$_2$Ge$_2$Te$_6$, with thicknesses down to 30 nm. The resulting magnon polaritons-hybrid excitations of cavity photons and magnons-are evidenced by reproducible avoided crossings across six devices, enabled by a low-impedance superconducting resonator design. The coupling strength follows the expected square-root dependence on thickness, and extrapolation of this scaling indicates that hybridization in the monolayer limit is within reach. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_12298 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Magnon polaritons in a van der Waals ferromagnet coupled to a superconducting resonator Bermejillo-Seco, Alvaro van der Goot, Luuk J. Arfini, Matteo Blanter, Yaroslav M. Steele, Gary A. van der Zant, Herre S. J. Mesoscale and Nanoscale Physics Achieving magnon-photon hybridization in the microwave regime is essential for integrating magnetic excitations with superconducting circuits. While this has been extensively demonstrated in bulk magnetic systems, realizing it in two-dimensional van der Waals materials remains challenging due to their reduced magnetic volume and increased dissipation. Here, magnon-photon hybridization is observed in exfoliated flakes of the van der Waals ferromagnet Cr$_2$Ge$_2$Te$_6$, with thicknesses down to 30 nm. The resulting magnon polaritons-hybrid excitations of cavity photons and magnons-are evidenced by reproducible avoided crossings across six devices, enabled by a low-impedance superconducting resonator design. The coupling strength follows the expected square-root dependence on thickness, and extrapolation of this scaling indicates that hybridization in the monolayer limit is within reach. |
| title | Magnon polaritons in a van der Waals ferromagnet coupled to a superconducting resonator |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2605.12298 |