Coherent pumping of high-momentum magnons by light
Fran Šimić (Kavli institute of nanoscience Delft)
Sanchar Sharma (Kavli institute of nanoscience Delft, TU Delft - QN/Bauer Group)
Yaroslav Blanter (TU Delft - QN/Blanter Group, Kavli institute of nanoscience Delft)
G.E. Bauer (Kavli institute of nanoscience Delft, Tohoku University, TU Delft - QN/Bauer Group)
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Abstract
We propose and model a method 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 submillimeter-size yttrium iron garnet spheres, a milliwatt laser input power generates 106-108 coherent magnons. The large magnon population enhances Brillouin light scattering, a probe suitable to access their quantum properties.