Conference »Quantum Physics of Nature« (QUPON 2005) Mitschnitt einer Veranstaltung der Fakultät für Physik der Universität Wien am Sonntag, dem 22. Mai 2005 im Großen Festsaal der Universität Wien Teil 12: Christophe Salomon: Ultracold Fermi gases - from Bose-Einstein Condensation of Molecules to Cooper pairs Abstract: We will describe recent experiments aiming at studying superfluidity in ultra-cold Fermi gases. Because of the Pauli Exclusion Principle, cooling methods and analysis techniques developed for bosons must be modified for fermions. Thanks to a resonance phenomenon in ultra-cold collisions, it is possible to adjust the sign and magnitude of the effective interaction between trapped fermions and to enter into the strongly correlated regime. Taking advantage of this tunability of interactions, it has been possible to produce Bose-Einstein condensates (BEC) of molecules and to study some of their properties. We will then present data recorded in the crossover region between BEC of molecules and the BCS regime of fermions with weak attractive interaction. Finally a few perspectives for this work at the interface between atomic physics and condensed matter physics will be given. Christophe Salomon ist Forschungsdirektor an der École normale supérieure in Paris. INHALT ====== Kapitel Titel Position --------------------------------------------------------------------- 1. Vorspann 00:00:00 2. Quantum statistics. Bose-Einstein-condensate 00:00:09 3. Fermi superfluid and BEC of molecules 00:04:24 4. BCS Theory. Cooper pairs 00:07:50 5. Thermodynamic model. Stability of bound molecules 00:17:39 6. BEC-BCS crossover 00:24:49 7. Measurement of momentum distribution 00:31:03 8. Open questions and perspectives 00:36:33

video/mp4

MP4-kompatibler Mediaplayer

PT0H42M24S

(c) Österreichische Zentralbibliothek für Physik