Vortex-mediated relaxation of magnon BEC into light Higgs quasiparticles

Autti, Samuli and Heikkinen, P. J. and Laine, S. M. and Makinen, J.T. and Thuneberg, E. and Zavyalov, Vladislav and Eltsov, V. B. (2021) Vortex-mediated relaxation of magnon BEC into light Higgs quasiparticles. Physical Review Research, 3 (3). ISSN 2643-1564

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Abstract

A magnon Bose-Einstein condensate (BEC) in superfluid 3He 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 3He−B and lays the groundwork for building magnon-based quantum devices.

Item Type:
Journal Article
Journal or Publication Title:
Physical Review Research
ID Code:
155370
Deposited By:
Deposited On:
26 May 2021 13:15
Refereed?:
Yes
Published?:
Published
Last Modified:
06 Jun 2022 14:00