Bose-Einstein condensation of quasiparticles by rapid cooling

Autor(en)

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

Abstrakt

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.

Organisation(en)

Nanomagnetismus und Magnonik

Externe Organisation(en)

Technische Universität Kaiserslautern, University of Colorado, Colorado Springs, Johannes Gutenberg-Universität Mainz, THATec Innovat GmbH, Martin-Luther-Universität Halle-Wittenberg, Innovent e.V. Technologieentwicklung Jena, Oakland University

Journal

Nature Nanotechnology

Band

15

Seiten

457–461

Anzahl der Seiten

5

ISSN

1748-3387

DOI

https://doi.org/10.1038/s41565-020-0671-z

Publikationsdatum

04-2020

Peer-reviewed

Ja

ÖFOS 2012

103015 Kondensierte Materie

Schlagwörter

ASJC Scopus Sachgebiete

Condensed Matter Physics, Bioengineering, Atomic and Molecular Physics, and Optics, Allgemeine Materialwissenschaften, Electrical and Electronic Engineering, Biomedical Engineering

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/23ef6690-275d-4179-84c9-616ed32b136b