University of Oulu

Autti, S., Heikkinen, P. J., Laine, S. M., Mäkinen, J. T., Thuneberg, E. V., Zavjalov, V. V., & Eltsov, V. B. (2021). Vortex-mediated relaxation of magnon BEC into light Higgs quasiparticles. In Physical Review Research (Vol. 3, Issue 3). American Physical Society (APS). https://doi.org/10.1103/physrevresearch.3.l032002

Vortex-mediated relaxation of magnon BEC into light Higgs quasiparticles

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Author: Autti, S.1,2; Heikkinen, P. J.1,3; Laine, S. M.4;
Organizations: 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
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 0.7 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2021102151920
Language: English
Published: American Physical Society, 2021
Publish Date: 2021-10-21
Description:

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.

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Series: Physical review research
ISSN: 2643-1564
ISSN-E: 2643-1564
ISSN-L: 2643-1564
Volume: 3
Issue: 3
Article number: L032002
DOI: 10.1103/PhysRevResearch.3.L032002
OADOI: https://oadoi.org/10.1103/PhysRevResearch.3.L032002
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
Subjects:
Funding: This work has been supported by the European Union's Horizon 2020 research and innovation programme (Grant No. 694248). The experimental work was carried out in the Low Temperature Laboratory, which is a part of the OtaNano research infrastructure of Aalto University and of the EU H2020 European Microkelvin Platform (Grant No. 824109). S.A. and V.V.Z. were funded by UK EPSRC (Grant No. EP/P024203/1). S.A. acknowledges support from the Jenny and Antti Wihuri Foundation, P.J.H. that from the Väisälä Foundation of the Finnish Academy of Science and Letters, and S.M.L. that from both of the above. E.V.T. acknowledges support by the Academy of Finland Centre of Excellence program (Project No. 312057).
Academy of Finland Grant Number: 312057
Detailed Information: 312057 (Academy of Finland Funding decision)
Copyright information: Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
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