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Kibble-Zurek dynamics and statistics of topological defects in chiral superfluid He3 films

Noble Gluscevich* and J. A. Sauls†

  • *Contact author: nglusc1@lsu.edu
  • †Contact author: sauls@lsu.edu
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Phys. Rev. B 111, 214526 – Published 26 June, 2025

DOI: https://doi.org/10.1103/tlv7-bvkh

Abstract

In equilibrium, confined films of superfluid He3-A have the chiral axis ℓ̂ locked normal to the surface of the film. There are two degenerate ground states, ℓ̂||±ẑ. However, for a temperature quench, i.e., cool down through the phase transition at a finite rate, causally disconnected regions of order parameter fluctuations develop and evolve into an inhomogeneous ordered phase that hosts both domain walls between time-reversed chiral phases as well as vortices with winding numbers p∈Z. We present simulations based on a time-dependent generalization of Ginzburg-Landau theory for strong-coupling He3 that reveal both types of topological defects to be present following the temperature quench. Results for the dynamics of vortices interacting with antivortices as well as domain walls are presented. The vortex number density as a function of quench rate agrees well with the scaling predicted by Kibble and Zurek. We also present results for the number distribution and compare with other theoretical models for full-counting statistics of the topological defect density. Finally, we present results for an asymmetry in the post-freeze-out populations of inequivalent vortex core structures that are characteristic of a chiral superfluid.

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Outline

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Phys. Rev. B 111, 214526– Published 26 June, 2025
  • Received 4 December 2024
  • Revised 29 May 2025
  • Accepted 12 June 2025
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