Abstract
Coupling of spin-waves with electromagnetic cavity field is demonstrated in an antiferromagnet, dysprosium ferrite (DyFeO3). By measuring transmission at 0.2-0.35 THz and sweeping sample temperature, magnon-photon coupling signatures were found at crossings of spin-wave resonances with Fabry-Perot cavity modes formed in samples. The obtained spectra are explained in terms of classical electrodynamics and a microscopic model.
Highlights
Coupling of matter and electromagnetic radiation [1] is a topic of great interest in solid state physics research because of their hybrid quantum nature [2]
A strong-coupling regime can be achieved when losses are smaller than the exchange rate between light and matter [8], giving rise to the vacuum Rabi splitting
The Purcell enhancement and the vacuum Rabi splitting were demonstrated in ferromagnetic materials [19,20,21,22]
Summary
Coupling of matter and electromagnetic radiation [1] is a topic of great interest in solid state physics research because of their hybrid quantum nature [2]. Polaritons in the terahertz region were shown with intersubband transitions [3,4], cyclotron resonance [5], and plasmons [6] in two-dimensional electron gases, as well as with intermolecular transitions in organic materials [7] In these systems, a strong-coupling regime can be achieved when losses are smaller than the exchange rate between light and matter [8], giving rise to the vacuum Rabi splitting. It is interesting to investigate magnon-photon coupling in antiferromagnetic materials [1] in view of their highfrequency spin dynamics [23,24,25,26,27], comparing to that of ferromagnets. In DFO, the spin canting allows two antiferromagnetic resonance modes to be excited: the quasiferromagnetic (qFMR) and the quasiantiferromagnetic (qAFMR) [28,29,39,40,41], which are excited by the magnetic component of radiation [42]
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