Bose-Einstein condensation of magnons in atomic hydrogen gas
Abstract
We report on experimental observation of BEC-like behaviour 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 Schr\"odinger-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 non-equilibrium magnons which were formed by applying the rf power.
Keywords
Cite
@article{arxiv.1502.03963,
title = {Bose-Einstein condensation of magnons in atomic hydrogen gas},
author = {O. Vainio and J. Ahokas and J. Järvinen and L. Lehtonen and S. Novotny and S. Sheludiakov and K. -A. Suominen and S. Vasiliev and D. Zvezdov and V. V. Khmelenko and D. M. Lee},
journal= {arXiv preprint arXiv:1502.03963},
year = {2015}
}
Comments
5 pages, 3 figures Supplemental material: 3 pages, 3 figures. Accepted for publication in Physical Review Letters