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Physics World

New era for condensates

Published Dec 1, 2003• 0 citations
Publisher

Abstract

Physicists are getting closer and closer to the holy grail of research into ultracold atomic gases – the observation of superfluidity in a Fermi gas. Research groups in Austria and the US have recently taken a major step towards this goal by creating a Bose–Einstein condensate of bosonic molecules from a gas of fermionic atoms. If the atoms can be persuaded to form weakly bound pairs, rather than molecules, physicists hope to learn more about the basic mechanisms responsible for superconductivity.

DOI
10.1088/2058-7058/16/12/1

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Physicists are getting closer and closer to the holy grail of research into ultracold atomic gases – the observation of superfluidity in a Fermi gas. Research groups in Austria and the US have recently taken a major step towards this goal by creating a Bose–Einstein condensate of bosonic molecules from a gas of fermionic atoms. If the atoms can be persuaded to form weakly bound pairs, rather than molecules, physicists hope to learn more about the basic mechanisms responsible for superconductivity.
The quantum mechanical phenomenon of Bose-Einstein condensation appears throughout physics with manifestations ranging from superconductivity in metals to superfluidity in nuclei and neutron stars. In most cases the condensation emerges due to correlations or pairing of fermionic particles. We explore this quantum behavior in a uniquely controllable and clean system consisting of an ultracold gas of atoms. In particular, by tuning the interactions between the fermionic atoms that make up our ultracold gas we can create condensates consisting of pairs of correlated atoms. These experiments introduce the ability to access the intriguing crossover regime where the quantum behavior of fermions becomes intertwined with that of bosons.
Ever since the discovery of Bose-Einstein condensation in an atomic Bose gas in 1995, physicists have been searching for its analog, the fermion superfluid in atomic Fermi gases. Fermion superfluids are expected to exhibit quantum phenomena on the macroscopic scale, just as Bose-Einstein condensates do. Making use of a process called Feshbach resonance, which allows the interaction between atoms to be increased strongly, several groups have recently reported evidence on fermion superfluids. In his Perspective, [Ho][1] highlights the report by [ Chin et al .][2], who have directly observed a pairing gap, a key property of a fermion superfluid. Their interpretation is strongly supported by the theoretical calculation of [ Kinnunen et al .][3] Ho argues that the evidence accumulated so far provides an overwhelming case for the realization of fermion superfluids. [1]: http://www.sciencemag.org/cgi/content/full/305/5687/1114 [2]: http://www.sciencemag.org/cgi/content/short/305/5687/1128 [3]: http://www.sciencemag.org/cgi/content/short/305/5687/1131