Superfluid flow above the critical velocity.

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_name

Sci Rep

journal_title

Scientific reports

authors

Paris-Mandoki A,Shearring J,Mancarella F,Fromhold TM,Trombettoni A,Krüger P

doi

10.1038/s41598-017-08941-8

subject

Has Abstract

pub_date

2017-08-22 00:00:00

pages

9070

issue

1

issn

2045-2322

pii

10.1038/s41598-017-08941-8

journal_volume

7

pub_type

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