Optical Cooling of Magnons

Journal article (2018)

Authors

S. Sharma QN/Bauer Group - AS , Kavli institute of nanoscience Delft
Y.M. Blanter QN/Blanter Group - AS , Kavli institute of nanoscience Delft
G.E. Bauer Kavli institute of nanoscience Delft, QN/Bauer Group - AS , Tohoku University
Research Group
QN/Bauer Group (AS) (TU Delft)
Copyright: © 2018 S. Sharma, Y.M. Blanter, G.E. Bauer
DOI: https://doi.org/10.1103/PhysRevLett.121.087205
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Published Date

2018

Language

English

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Faculty

Applied Sciences

Department

QN/Quantum Nanoscience

Research Group

QN/Bauer Group

Abstract

Inelastic scattering of light by spin waves generates an energy flow between the light and magnetization fields, a process that can be enhanced and controlled by concentrating the light in magneto-optical resonators. Here, we model the cooling of a sphere made of a magnetic insulator, such as yttrium iron garnet, using a monochromatic laser source. When the magnon lifetimes are much larger than the optical ones, we can treat the latter as a Markovian bath for magnons. The steady-state magnons are canonically distributed with a temperature that is controlled by the light intensity. We predict that such a cooling process can significantly reduce the temperature of the magnetic order within current technology.