- Letter
Long-range propagation of magnon polaritons in a canted antiferromagnet
Phys. Rev. Applied 23, L061002 – Published 16 June, 2025
DOI: https://doi.org/10.1103/7kyn-875x
Abstract
We report strong coupling between magnons and cavity photons in a single-crystalline slab of - (hematite) with canted antiferromagnetic order at room temperature. The hybridized magnon polaritons propagate over many millimeters due to their high group velocities, as experimentally characterized using time-of-flight spectroscopy. The conventional dipolar and spin-orbit-interaction-induced chirality can explain an observed nonreciprocity. Our findings highlight the potential of antiferromagnetic magnon polaritons for on-chip spin-based information technologies.