Decay of a Quantum Knot

T. Ollikainen (Corresponding Author), A. Blinova, M. Möttönen, D. S. Hall

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Abstract

We experimentally study the dynamics of quantum knots in a uniform magnetic field in spin-1 Bose-Einstein condensates. The knot is created in the polar magnetic phase, which rapidly undergoes a transition toward the ferromagnetic phase in the presence of the knot. The magnetic order becomes scrambled as the system evolves, and the knot disappears. Strikingly, over long evolution times, the knot decays into a polar-core spin vortex, which is a member of a class of singular SO(3) vortices. The polar-core spin vortex is stable with an observed lifetime comparable to that of the condensate itself. The structure is similar to that predicted to appear in the evolution of an isolated monopole defect, suggesting a possible universality in the observed topological transition.

Original languageEnglish
Article number163003
JournalPhysical Review Letters
Volume123
Issue number16
DOIs
Publication statusPublished - 16 Oct 2019
MoE publication typeA1 Journal article-refereed

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    Ollikainen, T., Blinova, A., Möttönen, M., & Hall, D. S. (2019). Decay of a Quantum Knot. Physical Review Letters, 123(16), [163003]. https://doi.org/10.1103/PhysRevLett.123.163003