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arXiv · 1108.5534

Universal mechanism of dissipation in Fermi superfluids at ultra low temperatures

Mihail A. Silaev
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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 $0.2 T_c$. 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.

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Mihail A. Silaev. 2011-12-15. Universal mechanism of dissipation in Fermi superfluids at ultra low temperatures. https://doi.org/10.1103/physrevlett.108.045303

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