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Thermal dissipation in quantum turbulence.

Michikazu Kobayashi1, Makoto Tsubota

  • 1Department of Physics, Osaka City University, Sumiyoshi-Ku, Osaka 558-8585, Japan.

Physical Review Letters
|December 13, 2006
PubMed
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Thermal dissipation in quantum turbulence was numerically studied. At higher temperatures, dissipation affects vortex dynamics, enabling calculation of mutual friction coefficients in Bose-Einstein condensates.

Area of Science:

  • Quantum turbulence
  • Bose-Einstein condensates
  • Low-temperature physics

Background:

  • Quantum turbulence is a key phenomenon in superfluids.
  • Understanding thermal dissipation is crucial for explaining energy decay in superfluids.
  • Vortex dynamics play a central role in quantum turbulence.

Purpose of the Study:

  • To numerically investigate the microscopic mechanism of thermal dissipation in quantum turbulence.
  • To analyze the influence of temperature on dissipation scales and vortex dynamics.
  • To determine the mutual friction coefficients in dilute Bose-Einstein condensates.

Main Methods:

  • Solving the coupled Gross-Pitaevskii equation and Bogoliubov-de Gennes equation.
  • Numerical simulations of quantum turbulence.

Related Experiment Videos

  • Analysis of vortex core size and large-scale dissipation.

    • Main Results:

    • Dissipation is limited to scales larger than the vortex core size at low temperatures.
    • At increased temperatures, dissipation extends to larger scales, impacting vortex dynamics.
    • Mutual friction coefficients were successfully obtained as functions of temperature.

    Conclusions:

    • Temperature significantly influences the scale at which thermal dissipation occurs in quantum turbulence.
    • The study provides a microscopic understanding of thermal dissipation in Bose-Einstein condensates.
    • The obtained mutual friction coefficients offer valuable data for superfluid dynamics research.