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Evolution of an isolated monopole in a spin-1 Bose-Einstein condensate

Konstantin Tiurev, Pekko Kuopanportti, András Márton Gunyhó, Masahito Ueda, and Mikko Möttönen
Phys. Rev. A 94, 053616 – Published 16 November 2016

Abstract

We simulate the decay dynamics of an isolated monopole defect in the nematic vector of a spin-1 Bose-Einstein condensate during the polar-to-ferromagnetic phase transition of the system. Importantly, the decay of the monopole occurs in the absence of external magnetic fields and is driven principally by the dynamical instability due to the ferromagnetic spin-exchange interactions. An initial isolated monopole is observed to relax into a polar-core spin vortex, thus demonstrating the spontaneous transformation of a point defect of the polar order parameter manifold to a line defect of the ferromagnetic manifold. We also investigate the dynamics of an isolated monopole pierced by a quantum vortex line with winding number κ. It is shown to decay into a coreless Anderson-Toulouse vortex if κ=1 and into a singular vortex with an empty core if κ=2. In both cases, the resulting vortex is also encircled by a polar-core vortex ring.

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  • Received 8 September 2016

DOI:https://doi.org/10.1103/PhysRevA.94.053616

©2016 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Konstantin Tiurev1,*, Pekko Kuopanportti2, András Márton Gunyhó1, Masahito Ueda3,4, and Mikko Möttönen1,5

  • 1QCD Labs, COMP Centre of Excellence, Department of Applied Physics, Aalto University, P.O. Box 13500, FI-00076 Aalto, Finland
  • 2School of Physics and Astronomy, Monash University, Victoria 3800, Australia
  • 3Department of Physics, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033, Japan
  • 4RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan
  • 5Department of Mathematical Information Technology, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland

  • *konstantin.tiurev@aalto.fi

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Issue

Vol. 94, Iss. 5 — November 2016

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