A1 Journal article – refereed
Bose-Einstein Condensation of Magnons in Atomic Hydrogen Gas

List of Authors: O. Vainio, J. Ahokas, J. Järvinen, L. Lehtonen, S. Novotny, S. Sheludiakov, K.-A. Suominen, S. Vasiliev, D. Zvezdov, V. V. Khmelenko, D. M. Lee
Publisher: American Physical Society
Publication year: 2015
Journal: Physical Review Letters
Journal acronym: PRL
Volume number: 114
Issue number: 12
Number of pages: 5
ISSN: 0031-9007


We report on experimental observation of Bose-Einstein condensation (BEC)-like behavior of quantized electron spin waves (magnons) in a dense gas of spin-polarized atomic hydrogen. The magnons are trapped and controlled with inhomogeneous magnetic fields and described by a Schrödinger-like wave equation, in analogy to the BEC experiments with neutral atoms. We have observed the appearance of a sharp feature in the ESR spectrum displaced from the normal spin wave spectrum. We believe that this observation corresponds to a sudden growth of the ground-state population of the magnons and emergence of their spontaneous coherence for hydrogen gas densities exceeding a critical value, dependent on the trapping potential. We interpret the results as a BEC of nonequilibrium magnons which were formed by applying the rf power.

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Last updated on 2019-03-09 at 17:44