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Measurement of vortex diffusivity and lifetime below the Kosterlitz-Thouless transition in helium films

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Abstract

Using vortex pair motion, we have measured the vortex diffusivity below the Kosterlitz-Thouless transition temperature (T KT) in atomically thin superfluid helium films on both argon and neon substrates. The diffusivities are on the order ofħ/m nearT KT and then fall rapidly to10 −3 ħ/m near0.1 K for argon and to0.03 ħ/m for neon. However, for the thinnest helium film on neon, the diffusivity is large and independent of temperature. At small flow velocities, dissipation due to unpaired vortices indicates a vortex lifetime on the order of seconds for a neon substrate near0.1 K.

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Volz, S.M., Gillis, K.A., Shirron, P.J. et al. Measurement of vortex diffusivity and lifetime below the Kosterlitz-Thouless transition in helium films. J Low Temp Phys 78, 325–334 (1990). https://doi.org/10.1007/BF00683314

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Keywords

  • Vortex
  • Argon
  • Helium
  • Transition Temperature
  • Flow Velocity