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Title: Towards quantum turbulence in cold atomic fermionic superfluids

Journal Article · · Journal of Physics. B, Atomic, Molecular and Optical Physics
 [1];  [2];  [3]
  1. University of Washington, Seattle, WA (United States)
  2. University of Washington, Seattle, WA (United States); Washington State University, Pullman, WA (United States)
  3. University of Washington, Seattle, WA (United States); Warsaw University of Technology (Poland)

Fermionic superfluids provide a new realization of quantum turbulence, accessible to both experiment and theory, yet relevant to phenomena from both cold atoms to nuclear astrophysics. In particular, the strongly interacting Fermi gas realized in cold-atom experiments is closely related to dilute neutron matter in neutron star crusts. Unlike the liquid superfluids 4He (bosons) and 3He (fermions), where quantum turbulence has been studied in laboratory for decades, superfluid Fermi gases stand apart for a number of reasons. They admit a rather reliable theoretical description based on density functional theory called the time-dependent superfluid local density approximation that describes both static and dynamic phenomena. Cold atom experiments demonstrate exquisite control over particle number, spin polarization, density, temperature, and interaction 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 the time-dependent theoretical techniques. While similar experimental and theoretical 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 the study of exotic superfluid phenomena such as the Larkin–Ovchinnikov–Fulde–Ferrell pairing mechanism for polarized superfluids which may give rise to 3D supersolids, and a pseudo-gap at finite temperatures that might affect the regime of classical turbulence. 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.

Research Organization:
Univ. of Washington, Seattle, WA (United States)
Sponsoring Organization:
Polish National Science Center (NCN); USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
FG02-97ER41014; AC02-05CH11231; AC05-00OR22725; UMO-2013/08/A/ST3/00708; UMO-2014/13/D/ST3/01940
OSTI ID:
1535480
Alternate ID(s):
OSTI ID: 1334543
Journal Information:
Journal of Physics. B, Atomic, Molecular and Optical Physics, Vol. 50, Issue 1; ISSN 0953-4075
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 12 works
Citation information provided by
Web of Science

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