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Friday, February 16, 2007
Physics Building, Room 204
Note special time.
Carlos Sa de Melo
[Host: Joe Poon]
"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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