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 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 non-equilibrium magnons which were formed by applying the rf power.

arXiv comment5 pages, 3 figures Supplemental material: 3 pages, 3 figures. Accepted for publication in Physical Review Letters

References in corpus (5)

• Bose-Einstein condensation of photons in an optical microcavity
• Bose-Einstein Condensation of Atomic Hydrogen
• Spin self-rephasing and very long coherence times in a trapped atomic ensemble
• Observation of anomalous spin-state segregation in a trapped ultra-cold vapor
• Guiding and Trapping Electron Spin Waves in Atomic Hydrogen Gas

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