News of the WeekPhysics

All Paired Up but Unable to Flow, Atoms Strain Key Conceptual Link

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Science  11 May 2007:
Vol. 316, Issue 5826, pp. 815
DOI: 10.1126/science.316.5826.815a

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In an experiment reported on page 867 of this issue of Science, atoms pair up in an ultracold gas but do not flow without resistance, even at temperatures approaching absolute zero. The finding appears to clash with a theorem which states that fermions that do not form a superfluid cannot pair either. (Read more.)