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

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.

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Ecited levels, Ground states, Magnon Bose-Einstein Condenssates

DOI

10.1103/PhysRevLett.108.145303

Citation

Autti, S, Bunkov, Y M, Eltsov, V B, Heikkinen, P J, Hosio, J J, Hunger, P, Krusius, M & Volovik, G E 2012, ' Self-trapping of magnon Bose-Einstein Condensates in the ground state and on excited levels: from harmonic to box confinement ', Physical Review Letters, vol. 108, no. 14, 145303, pp. 1-5 . https://doi.org/10.1103/PhysRevLett.108.145303

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https://urn.fi/URN:NBN:fi:aalto-201708036415

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[article-cris] Perustieteiden korkeakoulu / SCI

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

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