Vortex-mediated relaxation of magnon BEC into light Higgs quasiparticles
Autti, S.; Heikkinen, P. J.; Laine, S. M.; Mäkinen, J. T.; Thuneberg, E. V.; Zavjalov, V. V.; Eltsov, V. B. (2021-07-02)
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
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.
https://creativecommons.org/licenses/by/4.0/
https://urn.fi/URN:NBN:fi-fe2021102151920
Tiivistelmä
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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