Ultrastrong magnon-photon coupling in superconductor/antiferromagnet/superconductor heterostructures at terahertz frequencies
arXiv:2510.24264 · doi:10.1103/j9sm-h996
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 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.
References in corpus (14)
- Strongly coupled magnons and cavity microwave photons
- Hybridizing ferromagnetic magnons and microwave photons in the quantum limit
- Hybrid quantum systems based on magnonics
- Entanglement-based single-shot detection of a single magnon with a superconducting qubit
- Spin Insulatronics
- Quantum amplification and simulation of strong and ultrastrong coupling of light and matter
- Magnetic spheres in microwave cavities
- Ultra-strong photon-to-magnon coupling in multilayered heterostructures involving superconducting coherence via ferromagnetic layers
- Approaching to the deep-strong photon-to-magnon coupling
- Strong coupling antiferromagnetic resonance with sub-THz cavity fields
- Ultrastrong magnon-photon coupling and entanglement in superconductor/ferromagnet nanostructures
- Terahertz cavity magnon polaritons
- Spin Quenching and Transport by Hidden Dzyaloshinskii-Moriya Interactions
- Ultra-strong coupling of two ferromagnets via Meissner currents