From Kinetic Instability to Bose-Einstein Condensation and Magnon Supercurrents
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 mat...
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| creator | Kreil, Alexander J E Bozhko, Dmytro A Halyna Yu Musiienko-Shmarova L'vov, Victor S Pomyalov, Anna Burkard Hillebrands Serga, Alexander A |
| description | 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. |
| doi_str_mv | 10.48550/arxiv.1803.11548 |
| format | Article |
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| subjects | Condensates Helium Light scattering Magnetic properties Magnons Physics - Other Condensed Matter Physics - Quantum Gases Stability Yttrium Yttrium-iron garnet |
| title | From Kinetic Instability to Bose-Einstein Condensation and Magnon Supercurrents |
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