Self-trapping of magnon Bose-Einstein Condensates in the ground state and on excited levels: from harmonic to box confinement

S. Autti, Yu.M. Bunkov, V.B. Eltsov, P.J. Heikkinen, J.J. Hosio, P. Hunger, M. Krusius, G.E. Volovik

    Research output: Contribution to journalArticleScientificpeer-review

    38 Citations (Scopus)
    278 Downloads (Pure)

    Abstract

    Long-lived coherent spin precession of 3He−B at low temperatures around 0.2Tc is a manifestation of Bose-Einstein condensation of spin-wave excitations or magnons in a magnetic trap which is formed by the order-parameter texture and can be manipulated experimentally. When the number of magnons increases, the orbital texture reorients under the influence of the spin-orbit interaction and the profile of the trap gradually changes from harmonic to a square well, with walls almost impenetrable to magnons. This is the first experimental example of Bose condensation in a box. By selective rf pumping the trap can be populated with a ground-state condensate or one at any of the excited energy levels. In the latter case the ground state is simultaneously populated by relaxation from the exited level, forming a system of two coexisting condensates.
    Original languageEnglish
    Article number145303
    Pages (from-to)1-5
    JournalPhysical Review Letters
    Volume108
    Issue number14
    DOIs
    Publication statusPublished - 2012
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Ecited levels
    • Ground states
    • Magnon Bose-Einstein Condenssates

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