Coherent pumping of high momentum magnons by light
Fran \v{S}imi\'c, Sanchar Sharma, Yaroslav M. Blanter, Gerrit, E.W. Bauer
TL;DR
This paper introduces a method to coherently excite high-momentum magnons in optical cavities using counterpropagating light modes, significantly increasing magnon populations and enabling quantum property investigations.
Contribution
It presents a novel optical pumping scheme for high-momentum magnons in yttrium iron garnet spheres, achieving large coherent magnon populations with low laser power.
Findings
Generation of 10^6-10^8 magnons with mW laser power
Enhanced Brillouin light scattering signals
Potential to probe quantum properties of magnons
Abstract
We propose to excite a large number of coherent magnons with high momentum in optical cavities. This is achieved by two counterpropagating optical modes that are detuned by the frequency of a selected magnon, similar to stimulated Raman scattering. In sub-mm size yttrium iron garnet spheres, a mW laser input power generates 10^6-10^8 coherent magnons. The large magnon population enhances Brillouin light scattering, a probe suitable to access their quantum properties.
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