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Lookup NU author(s): Dr Luca Galantucci,
Professor Carlo Barenghi
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
Reconnections and interactions of filamentary coherent structures play a fundamental role in the dynamics of fluids,redistributing energy and helicity among the length scales and inducing fine-scale turbulent mixing. Unlike ordinary fluids, where vorticity is a continuous field, in quantum fluids vorticity is concentrated into discrete (quantized) vortex lines turning vortex reconnections into isolated events, conceptually easier to study. Here we report experimental and numerical observations of three-dimensional quantum vortex interactions in a cigar-shaped atomic Bose--Einstein Condensate. In addition to standard reconnections, already numerically and experimentally observed in homogeneous systems away from boundaries, we show that double reconnections, rebounds and ejections can also occur as a consequence of the non-homogeneous, confined nature of the system.
Author(s): Serafini S, Galantucci L, Iseni E, Bienaime T, Bisset RN, Barenghi CF, Dalfovo F, Lamporesi G, Ferrari G
Publication type: Article
Publication status: Published
Journal: Physical Review X
Online publication date: 25/05/2017
Acceptance date: 25/04/2017
Date deposited: 25/05/2017
ISSN (electronic): 2160-3308
Publisher: American Physical Society
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