Document Detail


Observing the drop of resistance in the flow of a superfluid Fermi gas.
MedLine Citation:
PMID:  23192151     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
The ability of particles to flow with very low resistance is characteristic of superfluid and superconducting states, leading to their discovery in the past century. Although measuring the particle flow in liquid helium or superconducting materials is essential to identify superfluidity or superconductivity, no analogous measurement has been performed for superfluids based on ultracold Fermi gases. Here we report direct measurements of the conduction properties of strongly interacting fermions, observing the well-known drop in resistance that is associated with the onset of superfluidity. By varying the depth of the trapping potential in a narrow channel connecting two atomic reservoirs, we observed variations of the atomic current over several orders of magnitude. We related the intrinsic conduction properties to the thermodynamic functions in a model-independent way, by making use of high-resolution in situ imaging in combination with current measurements. Our results show that, as in solid-state systems, current and resistance measurements in quantum gases provide a sensitive probe with which to explore many-body physics. Our method is closely analogous to the operation of a solid-state field-effect transistor and could be applied as a probe for optical lattices and disordered systems, paving the way for modelling complex superconducting devices.
Authors:
David Stadler; Sebastian Krinner; Jakob Meineke; Jean-Philippe Brantut; Tilman Esslinger
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Nature     Volume:  491     ISSN:  1476-4687     ISO Abbreviation:  Nature     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-29     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0410462     Medline TA:  Nature     Country:  England    
Other Details:
Languages:  eng     Pagination:  736-9     Citation Subset:  IM    
Affiliation:
Institute for Quantum Electronics, ETH Zurich, 8093 Zurich, Switzerland.
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Comments/Corrections
Comment In:
Nature. 2012 Nov 29;491(7426):681-2   [PMID:  23192144 ]

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