Universal mechanism of dissipation in Fermi superfluids at ultra low temperatures

Abstract

We show that the vortex dynamics in Fermi superfluids at ultra-low temperatures is governed by the local heating of the vortex cores creating the heat flux carried by non-equilibrium quasiparticles emitted by moving vortices. This mechanism provides a universal zero temperature limit of dissipation in Fermi superfluids. For the typical experimental conditions realized by the turbulent motion of ${}^3$He-B the temperature of vortex cores is estimated to be of the order $0.2T_c$. The dispersion of Kelvin waves is derived and the heat flow generated by Kelvin cascade is shown to have the value close to the experimentally observed.

4 pages, 1 figure, accepted to PRL

References in corpus (4)

• Bottleneck crossover between classical and quantum superfluid turbulence
• Quantum turbulence in propagating superfluid vortex front
• Kelvin-wave turbulence in superfluids
• Superfluid vortex front at T -> 0: Decoupling from the reference frame

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