Bottleneck accumulation of hybrid magneto-elastic bosons
Abstract
It is known that an ensemble of magnons, quanta of spin waves, can be prepared as a Bose gas of weakly interacting quasiparticles with conservation of the particle number. Furthermore, the thermalization of the overpopulated magnon gas can lead to the formation of a Bose-Einstein condensate at the bottom of a spin-wave spectrum. However, magnon-phonon scattering processes can significantly modify this scenario and new quasiparticles are formed - magneto-elastic bosons. Our observations of a parametrically populated magnon gas in a single-crystal film of Yttrium Iron Garnet by means of wavevector-resolved Brillouin light scattering spectroscopy including magneto-elastic coupling resulted in the discovery of a novel condensation phenomenon: A spontaneous accumulation of hybrid magneto-elastic bosonic quasiparticles at the intersection of the lowest magnon mode and a transversal acoustic wave.
Keywords
Cite
@article{arxiv.1612.05925,
title = {Bottleneck accumulation of hybrid magneto-elastic bosons},
author = {Dmytro A. Bozhko and Peter Clausen and Gennadii A. Melkov and Victor S. L'vov and Anna Pomyalov and Vitaliy I. Vasyuchka and Andrii V. Chumak and Burkard Hillebrands and Alexander A. Serga},
journal= {arXiv preprint arXiv:1612.05925},
year = {2017}
}