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Claude Cohen Tannoudji

Prix Nobel en 1997 pour le ralentissement et le piégeage des atomes par la lumière laser.

Ses travaux sont à la source des recherches actuelles de l'IFRAF.




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Probing Fermi gases with Bragg spectroscopy

Lundi 29 juin 2009, 11h30 salle Conf IV, département de physique, ENS 24 rue Lhomond, Paris.

Séminaire de Chris Vale (Centre for Atom Optics and Ultrafast Spectroscopy, Swinburne University of Technology, Australia)


Ultracold gases of fermionic atoms provide new opportunities for the study of pairing and superfluidity. This talk will describe experiments performed at Swinburne University using Bragg spectroscopy to study the Bose-Einstein condensate to Bardeen-Cooper-Schrieffer crossover in a gas of 6Li near a Feshbach resonance. A smooth transition from bosonic molecular dimers to free fermionic atoms is observed along with a clear signature of pairing above the Feshbach resonance. Bragg spectroscopy probes the dynamic and static structure factors and provides a direct link to two-body correlations. We have characterised these correlations and measured their density dependence across the broad Feshbach resonance at 834 G. We have also performed preliminary studies of the temperature dependence of pairing using Bragg spectroscopy.

Voir en ligne : http://www.swin.edu.au/bioscieleceng/soll/caous/

Post-scriptum :

Centre for Atom Optics and Ultrafast Spectroscopy
Swinburne University of Technology
Mail H38, PO Box 218
Hawthorn, Victoria 3122, Australia