The BEC–BCS Crossover: Some History and Some General Observations

  • A. J. Leggett
  • S. ZhangEmail author
Part of the Lecture Notes in Physics book series (LNP, volume 836)


While the experimental realization in ultracold Fermi alkali gases of the phenomenon we now call the “BEC–BCS crossover” was attained only in the last few years, theoretical considerations of this issue go back a lot further, and refer to other systems as well. In the first part of this chapter we review some of this history, while in the second half we make some general comments on the current theoretical situation with respect to the specific ultracold-gas implementation.


Cooper Pairing Fermi Wave Vector Excitonic Insulator Crossover Problem Closed Channel Molecule 
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This work was supported by the National Science Foundation under grants nos. NSF-DMR-0906921 and NSF-DMR-0907366.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  1. 1.Department of PhysicsUniversity of Illinois at Urbana-ChampaignChampaignUSA
  2. 2.Department of PhysicsThe Ohio State UniversityColumbusUSA

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