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Area of Science:

  • Condensed Matter Physics
  • Quantum Fluids

Background:

  • Fermi superfluids, exemplified by superfluid (3)He, possess a viscous normal component interacting with the superfluid component.
  • Mutual friction between these components damps quantized vortex lines, coupling the superfluid to its container.

Purpose of the Study:

  • To investigate the influence of decreasing temperature and mutual friction on superfluid dynamics.
  • To understand the transition from laminar to turbulent vortex motion and the decoupling phenomenon.

Main Methods:

  • Analysis of superfluid dynamics in Fermi superfluids under varying temperature and mutual friction conditions.
  • Observational study of quantized vortex line behavior and coupling effects.

Main Results:

  • Internal superfluid dynamics become dominant over damping and coupling effects as temperature and mutual friction decrease.
  • A temperature-dependent transition from laminar to turbulent vortex motion is observed.
  • Superfluid decoupling from the container's reference frame occurs at lower temperatures.

Conclusions:

  • The interplay between temperature, mutual friction, and internal dynamics significantly alters superfluid behavior.
  • Fermi superfluids exhibit complex transitions in vortex motion and reference frame coupling.
  • These findings offer insights into the fundamental properties of quantum fluids.