Skip to main content

Research Repository

See what's under the surface

Advanced Search

Superfluid flow above the critical velocity

Paris-Mandoki, A.; Shearring, Joe; Mancarella, F.; Fromhold, T.M.; Trombettoni, A.; Kruger, Peter

Authors

A. Paris-Mandoki

Joe Shearring

F. Mancarella

T.M. Fromhold

A. Trombettoni

Peter Kruger peter.kruger@nottingham.ac.uk



Abstract

Superfluidity and superconductivity have been widely studied since the last century in many different contexts ranging from nuclear matter to atomic quantum gases. The rigidity of these systems with respect to external perturbations results in frictionless motion for superfluids and resistance-free electric current flow in superconductors. This peculiar behaviour is lost when external perturbations overcome a critical threshold, i.e. above a critical magnetic field or a critical current for superconductors. In superfluids, such as liquid helium or ultracold gases, the corresponding quantities are a critical rotation rate and a critical velocity respectively. Enhancing the critical values is of great fundamental and practical value. Here we demonstrate that superfluidity can be completely restored for specific, arbitrarily large flow velocities above the critical velocity through quantum interference-induced resonances providing a nonlinear counterpart of the Ramsauer-Townsend effect occurring in ordinary quantum mechanics. We illustrate the robustness of this phenomenon through a thorough analysis in one dimension and prove its generality by showing the persistence of the effect in non-trivial 2d systems. This has far reaching consequences for the fundamental understanding of superfluidity and superconductivity and opens up new application possibilities in quantum metrology, e.g. in rotation sensing.

Journal Article Type Article
Publication Date Aug 21, 2017
Journal Scientific Reports
Print ISSN 2045-2322
Electronic ISSN 2045-2322
Publisher Nature Publishing Group
Peer Reviewed Peer Reviewed
Volume 7
Issue 1
Article Number 9070
APA6 Citation Paris-Mandoki, A., Shearring, J., Mancarella, F., Fromhold, T., Trombettoni, A., & Kruger, P. (2017). Superfluid flow above the critical velocity. Scientific Reports, 7(1), https://doi.org/10.1038/s41598-017-08941-8
DOI https://doi.org/10.1038/s41598-017-08941-8
Publisher URL https://doi.org/10.1038/s41598-017-08941-8
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0

Files

Superfluid s41598-017-08941-8.pdf (2.2 Mb)
PDF

Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0





You might also like



Downloadable Citations

;