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The BCS–BEC Crossover and the Unitary Fermi Gas

  • M. RanderiaEmail author
  • W. Zwerger
  • M. Zwierlein
Chapter
Part of the Lecture Notes in Physics book series (LNP, volume 836)

Abstract

There has been great excitement about the recent experimental and theoretical progress in elucidating the Bardeen-Cooper-Schrieffer (BCS) to Bose Einstein condensation (BEC) crossover in ultracold Fermi gases. Prior to these cold atom experiments, all known, and reasonably well understood, superconductors and superfluids were firmly in one of the two limits. Either they were well described by the celebrated BCS theory of pairing in Fermi systems, or they could be understood in terms of the BEC of bosons, with repulsive interactions. For the first time, the ultracold Fermi gases exhibited behavior that, with the turn of a knob, could be made to span the entire range from BCS to BEC. While such a crossover had been theoretically predicted, its actual realization in the laboratory was a major advance [1, 2], and led to intense investigation of the properties of the very strongly interacting, unitary regime that lies right in the middle of the crossover. We now understand that the unitary Fermi gas has remarkable universal properties, arising from scale invariance, and has connections with fields as diverse as nuclear physics and string theory.

Keywords

Bose Einstein Condensation Feshbach Resonance Mean Field Theory Closed Channel Superfluid Transition 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

M.R. would like to thank the US National Science Foundation (NSF-DMR 0706203) and the US Army Research Office (ARO W911NF- 08-1-0338) for support. W.Z. acknowledges support from the Deutsche Forschungsgemeinschaft through FOR801.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  1. 1.Department of PhysicsOhio State UniversityColumbusUSA
  2. 2.Physik DepartmentTechnische Universität MünchenGarchingGermany
  3. 3.Department of PhysicsMIT-Harvard Center for Ultracold Atoms and Research Laboratory of Electronics, MITCambridgeUSA

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