Universal Superfluidity in Ultracold Atomic Gases
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Résumé
It is now possible to create quantum fluids with quite odd properties by varying the magnetic field in ultracold atomic gases. These gases are dilute and interaction between their fermionic atoms can be described by a single parameter called "scattering length". By varying the magnetic field close to the so-called "Feshbach resonance", this length becomes infinite. One then obtains a universal fluid which is a system with strong interaction but universal properties, i.e., properties independent of any atomic parameter ! This fluid exhibits puzzling superfluid properties such as absence of viscosity, quantized vortices, two-fluid flow and two "sounds", as revealed through experimental data.
Note(s) Biographique(s)
Bibliographie
Orateur(s) : Lev Pitaevskii, Department of Physics, University of Trento and CNR-INO BEC Center, Trento, Italy
Public : Tous
Date : 9 avril 2013
Lieu : Campus Jussieu

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