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MA: Fachverband Magnetismus
MA 23: Functional Antiferromagnetism
MA 23.14: Vortrag
Dienstag, 17. März 2020, 13:00–13:15, HSZ 401
Antiferromagnetic cavity optomagnonics — •tahereh parvvini1, victor bittencourt2, and silvia viola kusminskiy3 — 1Max Planck Institute for the Science of Light, Staudtstr. 2, PLZ 91058, Erlangen, Germany — 2Max Planck Institute for the Science of Light, Staudtstr. 2, PLZ 91058, Erlangen, Germany — 3Max Planck Institute for the Science of Light, Staudtstr. 2, PLZ 91058, Erlangen, Germany
We propose a cavity optomagnonic system based on antiferromagnetic insulators. We derive the Hamiltonian of the system and obtain the coupling of the antiferromagnetic magnon modes to the optical cavity field as a function of magnetic field and material properties. We show that, in the presence of hard-axis anisotropy, the optomagnonic coupling can be tuned by a magnetic field applied along the easy axis, allowing to bring a selected magnon mode into and out of a dark mode. For easy-axis antiferromagnets the coupling is instead independent of the magnetic field. We study the dynamic features of the driven system including optically induced magnon amplification and cooling, Purcell enhancement of transmission, and induced transparency, and discuss their experimental feasibility.