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  • Letter
  • Open Access

Vortex-mediated relaxation of magnon BEC into light Higgs quasiparticles

S. Autti1,2,*, P. J. Heikkinen1,3, S. M. Laine4, J. T. Mäkinen1,5,6, E. V. Thuneberg4,7, V. V. Zavjalov1,2, and V. B. Eltsov1

  • 1Department of Applied Physics, Aalto University, P.O. Box 15100, FI-00076 AALTO, Finland
  • 2Department of Physics, Lancaster University, Lancaster LA1 4YB, United Kingdom
  • 3Department of Physics, Royal Holloway, University of London, Egham, Surrey TW20 0EX, United Kingdom
  • 4Nano and Molecular Systems Research Unit, University of Oulu, P.O. Box 3000, FI-90014 Oulu, Finland
  • 5Department of Physics, Yale University, New Haven, Connecticut 06520, USA
  • 6Yale Quantum Institute, Yale University, New Haven, Connecticut 06520, USA
  • 7Department of Applied Physics, QTF Centre of Excellence, Aalto University, FI-00076 AALTO, Finland

  • *s.autti@lancaster.ac.uk
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Phys. Rev. Research 3, L032002 – Published 2 July, 2021

DOI: https://doi.org/10.1103/PhysRevResearch.3.L032002

Abstract

A magnon Bose-Einstein condensate (BEC) in superfluid He3 is a fine instrument for studying the surrounding macroscopic quantum system. At zero temperature, the BEC is subject to a few distinct forms of decay into other collective excitations, owing to momentum and energy conservation in a quantum vacuum. We study the vortex-Higgs mechanism: The vortices relax the requirement for momentum conservation, allowing the optical magnons of the BEC to transform into light Higgs quasiparticles. This facilitates a direct measurement of the dimensions of the B-phase double-core vortex, providing experimental access to elusive phenomena, such as the Kelvin wave cascade and core-bound Majorana fermions. Our paper expands the spectrum of possible interactions between magnetic quasiparticles in He3−B and lays the groundwork for building magnon-based quantum devices.

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Phys. Rev. Research 3, L032002– Published 2 July, 2021
  • Received 15 January 2021
  • Accepted 20 May 2021
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