Details

Autor(en) / Beteiligte

• Schneider, Michael
• Brächer, Thomas
• Breitbach, David
• Lauer, Viktor
• Pirro, Philipp
• Bozhko, Dmytro A.
• Musiienko-Shmarova, Halyna Yu
• Heinz, Björn
• Wang, Qi
• Meyer, Thomas
• Heussner, Frank
• Keller, Sascha
• Papaioannou, Evangelos Th
• Lägel, Bert
• Löber, Thomas
• Dubs, Carsten
• Slavin, Andrei N.
• Tiberkevich, Vasyl S.
• Serga, Alexander A.
• Hillebrands, Burkard
• Chumak, Andrii V.

Titel

Bose–Einstein condensation of quasiparticles by rapid cooling

Ist Teil von

• Nature nanotechnology, 2020-06, Vol.15 (6), p.457-461

Ort / Verlag

London: Nature Publishing Group UK

Erscheinungsjahr

2020

Quelle

Nature Journals Online

Beschreibungen/Notizen

• The fundamental phenomenon of Bose–Einstein condensation has been observed in different systems of real particles and quasiparticles. The condensation of real particles is achieved through a major reduction in temperature, while for quasiparticles, a mechanism of external injection of bosons by irradiation is required. Here, we present a new and universal approach to enable Bose–Einstein condensation of quasiparticles and to corroborate it experimentally by using magnons as the Bose-particle model system. The critical point to this approach is the introduction of a disequilibrium of magnons with the phonon bath. After heating to an elevated temperature, a sudden decrease in the temperature of the phonons, which is approximately instant on the time scales of the magnon system, results in a large excess of incoherent magnons. The consequent spectral redistribution of these magnons triggers the Bose–Einstein condensation. A new method to form Bose–Einstein condensates of quasiparticles based on the rapid decrease in the phonon temperature was proposed and shown experimentally.