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Towards Quantum Turbulence in Cold Atomic Fermionic Superfluids | | Aurel Bulgac
; Michael McNeil Forbes
; Gabriel Wlazłowski
; | | Date: |
1 Sep 2016 | | Abstract: | Fermionic superfluids provide a new realization of quantum turbulence,
accessible to both experiment and theory, yet relevant to both cold atoms and
nuclear astrophysics. In particular, the strongly interacting Fermi gas
realized in cold-atom experiments is closely related to dilute neutron matter
in the neutron star crust. Unlike the liquid superfluids 4He (bosons) and 3He
(fermions), where quantum turbulence has been studied in laboratory for
decades, quantum gases, and in particular superfluid Fermi gases stand apart
for a number of reasons. Fermi gases admit a rather reliable microscopic
description based on density functional theory which describes both static and
dynamical phenomena. Cold atom experiments demonstrate exquisite control over
particle number, spin polarization, density, temperature, and interacting
strength. Topological defects such as domain walls and quantized vortices,
which lie at the heart of quantum turbulence, can be created and manipulated
with time-dependent external potentials, and agree with theory. While similar
control exists for weakly interacting Bose gases, the unitary Fermi gas is
strongly interacting. The resulting vortex line density is extremely high, and
quantum turbulence may thus be realized in small systems where classical
turbulence is suppressed. Fermi gases also permit studying exotic superfluids
such as the LOFF state for polarized superfluids which may give rise to 3D
supersolids. The dynamics associated with these phenomena has only started to
be explored. Finally, superfluid mixtures have recently been realized,
providing experimental access to phenomena like Andreev-Bashkin entrainment
predicted decades ago. Superfluid Fermi gases thus provide a rich forum for
addressing phenomena related to quantum turbulence with applications ranging
from terrestrial superfluidity to astrophysical dynamics in neutron stars. | | Source: | arXiv, 1609.0363 | | Services: | Forum | Review | PDF | Favorites | |
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