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

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The BCS-BEC Crossover and the Unitary Fermi Gas

Part of the book series: Lecture Notes in Physics ((LNP,volume 836))

Abstract

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.

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Notes

  1. 1.

    However, in discussing the stability of the system with respect to decay into deeply bound molecular states, such processes are of primary importance.

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Acknowledgments

This work was supported by the National Science Foundation under grants nos. NSF-DMR-0906921 and NSF-DMR-0907366.

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Authors and Affiliations

  1. Department of Physics, University of Illinois at Urbana-Champaign, Champaign, IL, USA

    A. J. Leggett

  2. Department of Physics, The Ohio State University, Columbus, OH, USA

    S. Zhang

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  1. A. J. Leggett
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  2. S. Zhang
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Correspondence to S. Zhang .

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Editors and Affiliations

  1. Fakultät für Physik, Physik-Department, Technische Universität München, James-Franck-Straße, Garching, 85747, Germany

    Wilhelm Zwerger

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Leggett, A., Zhang, S. (2012). The BEC–BCS Crossover: Some History and Some General Observations. In: Zwerger, W. (eds) The BCS-BEC Crossover and the Unitary Fermi Gas. Lecture Notes in Physics, vol 836. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-21978-8_2

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  • DOI: https://doi.org/10.1007/978-3-642-21978-8_2

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-21977-1

  • Online ISBN: 978-3-642-21978-8

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