From Kinetic Instability to Bose-Einstein Condensation and Magnon Supercurrents

Physical Review Letters
Alexander J E KreilAlexander A Serga

Abstract

Evolution of an overpopulated gas of magnons to a Bose-Einstein condensate and excitation of a magnon supercurrent, propelled by a phase gradient in the condensate wave function, can be observed at room temperature by means of the Brillouin light scattering spectroscopy in an yttrium iron garnet material. We study these phenomena in a wide range of external magnetic fields in order to understand their properties when externally pumped magnons are transferred towards the condensed state via two distinct channels: a multistage Kolmogorov-Zakharov cascade of the weak-wave turbulence or a one-step kinetic instability process. Our main result is that opening the kinetic instability channel leads to the formation of a much denser magnon condensate and to a stronger magnon supercurrent compared to the cascade mechanism alone.

References

Sep 29, 2006·Nature·J KasprzakLe Si Dang
Dec 31, 2008·Physical Review Letters·V E DemidovS O Demokritov
Jun 13, 2009·Physical Review Letters·A V ChumakS O Demokritov
Aug 7, 2010·The Review of Scientific Instruments·C W SandwegP Kopietz
Nov 26, 2010·Nature·Jan KlaersMartin Weitz
Jun 12, 2012·Physical Review Letters·Yu M BunkovM S Tagirov
Nov 5, 2013·Physical Review Letters·S R K RodriguezJ Gómez Rivas
Nov 19, 2013·Physical Review Letters·V I VasyuchkaB Hillebrands
Mar 13, 2014·Nature Communications·Alexander A SergaBurkard Hillebrands

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Citations

Jun 6, 2019·Nature Communications·Dmytro A BozhkoBurkard Hillebrands
May 31, 2019·Physical Review Letters·Scott A BenderRembert A Duine
Aug 19, 2020·Nature Materials·S AuttiV B Eltsov
Dec 19, 2020·Physical Review Letters·Saraswat BhattacharyyaEugene Demler
Mar 5, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Anjan BarmanM Winklhofer

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