Abstract
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.
| Original language | English |
|---|---|
| Article number | 237201 |
| Journal | Physical review letters |
| Volume | 118 |
| Issue number | 23 |
| DOIs | |
| Publication status | Published - 8 Jun 2017 |
Bibliographical note
Deutsche Forschungsgemeinschaft (project INST) within the Transregional Collaborative Research Centre from EU-FET (Grant InSpin) [161/544-3, SFB/TR 49, 612759]; State Fund for Fundamental Research of Ukraine (SFFR); fellowship of the Graduate School Material Sciences in Mainz (MAINZ) through DFG funding of the Excellence Initiative [GSC-266]Financial support from the Deutsche Forschungsgemeinschaft (project INST 161/544-3 within the Transregional Collaborative Research Centre SFB/TR 49 "Condensed Matter Systems with Variable Many-Body Interactions"), from EU-FET (Grant InSpin 612759) and from the State Fund for Fundamental Research of Ukraine (SFFR) is gratefully acknowledged. D. A. B. was supported by a fellowship of the Graduate School Material Sciences in Mainz (MAINZ) through DFG funding of the Excellence Initiative (GSC-266). As well we acknowledge I. I. Syvorotka (Scientific Research Company "Carat", Lviv, Ukraine) for supplying us with the YIG film sample.Financial support from the Deutsche Forschungsgemeinschaft (project INST 161/544-3 within the Transregional Collaborative Research Centre SFB/TR 49 "Condensed Matter Systems with Variable Many-Body Interactions"), from EU-FET (Grant InSpin 612759) and from the State Fund for Fundamental Research of Ukraine (SFFR) is gratefully acknowledged. D. A. B. was supported by a fellowship of the Graduate School Material Sciences in Mainz (MAINZ) through DFG funding of the Excellence Initiative (GSC-266). As well we acknowledge I. I. Syvorotka (Scientific Research Company "Carat", Lviv, Ukraine) for supplying us with the YIG film sample.
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy