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Vortex reconnections and rebounds in trapped atomic Bose-Einstein condensates

Lookup NU author(s): Dr Luca Galantucci, Professor Carlo Barenghi

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Abstract

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.

Publication metadata

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

Year: 2017

Volume: 7

Online publication date: 25/05/2017

Acceptance date: 25/04/2017

Date deposited: 25/05/2017

ISSN (electronic): 2160-3308

Publisher: American Physical Society

URL: https://doi.org/10.1103/PhysRevX.7.021031

DOI: 10.1103/PhysRevX.7.021031

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