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ics Colloquium
Friday, February 16, 2007
4:00 PM
Physics Building, Room 204
Note special time.
Carlos Sa de Melo [Host: Joe Poon]
Georgia Tech
"The Evolution from BCS to Bose-Einstein Condensation: Superfluidity in Metals, Neutrons Stars, Nuclei, and Ultra-Cold Atoms"
> Superfluidity is a very interesting phenomenon that has been found in metals, > neutron stars, nuclei and more recently in ultra-cold atoms. For a given > metal, neutron star, or nuclei there is essentially "zero" tunability of the > particle density or interaction strength, and thus superfluid properties can > not be controlled at the turn of a knob. However, in ultra-cold Fermi atoms > the interaction strength and the particle density can be tuned to change > qualitatively and quantitatively superfluid properties. This tunability allows > for the study of the evolution from BCS (weak coupling) superfluidity of large > Cooper pairs to Bose-Einstein condensation (strong coupling) superfluidity of > tightly bound molecules. I will discuss the BCS to BEC evolution in s-wave > and p-wave angular momentum channels, and will conclude that this evolution is just a crossover phenomenon for s-wave, while a quantum phase transition takes place for the p-wave case.

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