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arXiv · 2510.24264

Ultrastrong magnon-photon coupling in superconductor/antiferromagnet/superconductor heterostructures at terahertz frequencies

V. M. Gordeeva·Yanmeng Lei·Xiyin Ye·G. A. Bobkov·A. M. Bobkov·Tao Yu·I. V. Bobkova
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Abstract

We predict the realization of ultrastrong coupling between magnons of antiferromagnets and photons in superconductor/antiferromagnet/superconductor heterostructures at terahertz frequencies, from both quantum and classical perspectives. The hybridization of the two magnon modes with photons strongly depends on the applied magnetic field: at zero magnetic field, only a single antiferromagnetic mode with a lower frequency couples to the photon, forming a magnon-polariton, while using a magnetic field activates coupling for both antiferromagnetic modes. The coupling between magnon and photon is ultrastrong with the coupling constant $\sim$ 100 GHz exceeding 10% of the antiferromagnetic resonant frequency. The superconductor modulates the spin of the resulting magnon-polaritons and the group velocity, achieving values amounting to several tenths of the speed of light, which promises strong tunability of magnon transport in antiferromagnets by superconductors.

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V. M. Gordeeva, Yanmeng Lei, Xiyin Ye, G. A. Bobkov, A. M. Bobkov, Tao Yu, I. V. Bobkova. 2025-10-28. Ultrastrong magnon-photon coupling in superconductor/antiferromagnet/superconductor heterostructures at terahertz frequencies. https://doi.org/10.1103/j9sm-h996

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