Optical Cooling of Magnons
S. Sharma (TU Delft - QN/Bauer Group, Kavli institute of nanoscience Delft)
IM Blanter (TU Delft - QN/Blanter Group, Kavli institute of nanoscience Delft)
Gerrit Bauer (Tohoku University, Kavli institute of nanoscience Delft, TU Delft - QN/Bauer Group)
More Info
expand_more
Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.
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.