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Rotating quantum turbulence in the unitary Fermi gas | | Konrad Kobuszewski
; Khalid Hossain
; Michael McNeil Forbes
; Piotr Magierski
; Kazuyuki Sekizawa
; Gabriel Wlazłowski
; | | Date: |
15 Oct 2020 | | Abstract: | Quantized vortices carry the angular momentum in rotating superfluids, and
are key to the phenomenon of quantum turbulence. Advances in ultra-cold atom
technology enable quantum turbulence to be studied in regimes with both
experimental and theoretical control, unlike the original contexts of
superfluid helium experiments. While much work has been performed with bosonic
systems, detailed studies of fermionic quantum turbulence are nascent, despite
wide applicability to other contexts such as rotating neutron stars. In this
paper, we present the first large-scale study of quantum turbulence in rotating
fermionic superfluids using an accurate orbital based time-dependent density
functional theory (DFT) called the superfluid local density approximation
(SLDA). We identify two different modes of turbulent decay in the dynamical
equilibration of a rotating fermionic superfluid, and contrast these results
with a computationally simpler orbital-free DFT, which we find can
qualitatively reproduce these decay mechanisms if dissipation is explicitly
included. These results demonstrate that one-body dissipation mechanisms
intrinsic to fermionic superfluids play a key role differentiating fermionic
from bosonic turbulence, but also suggest that simpler orbital-free theories
may be corrected so that these more efficient techniques can be used to model
extended physical systems such as neutron superfluids in neutron stars. | | Source: | arXiv, 2010.07464 | | Services: | Forum | Review | PDF | Favorites | |
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