Magnetic dipolar modes in magnon-polariton condensates

TL;DR

This paper demonstrates the realization of magnon-polaritons through magnon condensation in a quasi-2D ferrite disk, revealing topological vortex states and superradiance effects in microwave structures.

Contribution

It introduces the concept of magnon-polaritons formed by magnetic dipole-dipole interactions and characterizes their vortex and topological properties in a microwave cavity.

Findings

Observation of quantized vortices in MDM spinor condensates

Detection of electric and magnetic dipole condensation

Evidence of vortex flows with fixed handedness at MDM resonances

Abstract

For dipole-carrying excitations observed in a high-quality resonator, strong-coupling modes can appear as composite bosons with the spontaneous formation of quantized vortices in the condensed phase of a polariton fluid. In exciton-polaritons, in particular, it leads to sustained trapping of the emitted photon. In this paper, we show that magnon-polaritons can be realized due to magnon condensation caused by magnetic dipole-dipole interaction. In a quasi-2D ferrite disk placed in a microwave cavity, one observes quantum confinement effects of magnetic-dipolar-mode (MDM) oscillations. These modes, characterized by energy eigenstates with rotational superflows and quantized vortices, are exhibited as spinor condensates. Along with the condensation of MDM magnons in the quasi-2D disk of the magnetic insulator, electric dipole condensation is also observed. At the MDM resonances, transfer between angular momenta in the magnetic insulator and in the vacuum cavity, demonstrates generation of vortex flows with fixed handedness. This indicates unique topological properties of polariton wavefronts. One observes curved wavefronts and effects of supperradiance in microwave structures. In an environment of scattering states of microwave waveguide, EM waves can carry the topological phases of MDM resonances.