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Emergence d'un condensat moléculaire de Bose-Einstein à partir d'un gaz de Fermi.

Emergence of a molecular Bose-Einstein condensate from a Fermi gas.

Auteurs : GREINER M., REGAL C. A., JIN D. S.

Type d'article : Article

Résumé

The realization of superfluidity in a dilute gas of fermionic atoms, analogous to superconductivity in metals, represents a long-standing goal of ultracold gas research. In such a fermionic superfluid, it should be possible to adjust the interaction strength and tune the system continuously between two limits: a Bardeen-Cooper-Schrieffer (BCS)-type superfluid (involving correlated atom pairs in momentum space) and a Bose-Einstein condensate (BEC), in which spatially local pairs of atoms are bound together. This crossover between BCS-type superfluidity and the BEC limit has long been of theoretical interest, motivated in part by the discovery of high-temperature superconductors. In atomic Fermi gas experiments superfluidity has not yet been demonstrated; however, long-lived molecules consisting of locally paired fermions have been reversibly created. In this article the authors report the direct observation of a molecular Bose-Einstein condensate created solely by adjusting the interaction strength in an ultra-cold Fermi gas of atoms. This state of matter represents one extreme of the predicted BCS-BEC continuum.

Détails

  • Titre original : Emergence of a molecular Bose-Einstein condensate from a Fermi gas.
  • Identifiant de la fiche : 2004-1532
  • Langues : Anglais
  • Source : Nature - vol. 426 - n. 6966
  • Date d'édition : 04/12/2003
  • Document disponible en consultation à la bibliothèque du siège de l'IIF uniquement.

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