Bottleneck Accumulation of Hybrid Magnetoelastic Bosons

Bottleneck Accumulation of Hybrid Magnetoelastic Bosons

An ensemble of magnons, quanta of spin waves, can be prepared as a Bose gas of weakly interacting quasiparticles. Furthermore, the thermalization of the overpopulated magnon gas through magnon-magnon scattering processes, which conserve the number of particles, can lead to the formation of a Bose-Ei...

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Veröffentlicht in:Physical review letters 2017-06, Vol.118 (23), p.237201-237201, Article 237201
Hauptverfasser: Bozhko, Dmytro A, Clausen, Peter, Melkov, Gennadii A, L'vov, Victor S, Pomyalov, Anna, Vasyuchka, Vitaliy I, Chumak, Andrii V, Hillebrands, Burkard, Serga, Alexander A
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container_end_page 237201
container_issue 23
container_start_page 237201
container_title Physical review letters
container_volume 118
creator Bozhko, Dmytro A
Clausen, Peter
Melkov, Gennadii A
L'vov, Victor S
Pomyalov, Anna
Vasyuchka, Vitaliy I
Chumak, Andrii V
Hillebrands, Burkard
Serga, Alexander A
description An ensemble of magnons, quanta of spin waves, can be prepared as a Bose gas of weakly interacting quasiparticles. Furthermore, the thermalization of the overpopulated magnon gas through magnon-magnon scattering processes, which conserve the number of particles, can lead to the formation of a Bose-Einstein condensate at the bottom of a spin-wave spectrum. However, magnon-phonon scattering can significantly modify this scenario and new quasiparticles are formed-magnetoelastic bosons. Our observations of a parametrically populated magnon gas in a single-crystal film of yttrium iron garnet by means of wave-vector-resolved Brillouin light scattering spectroscopy evidence a novel condensation phenomenon: A spontaneous accumulation of hybrid magnetoelastic bosonic quasiparticles at the intersection of the lowest magnon mode and a transversal acoustic wave.
doi_str_mv 10.1103/PhysRevLett.118.237201
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title Bottleneck Accumulation of Hybrid Magnetoelastic Bosons
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