Superfluidity and Bose-Einstein Condensation Coherence (Prof. Dr. Lev Pitaevskii)
- Datum: 16.10.2018
- Uhrzeit: 13:30 - 15:00
- Vortragende(r): Prof. Dr. Lev Pitaevskii
- University of Trento & P.L. Kapitza Institut for Physical Problems, Moscow
- Ort: Max-Planck-Institut für Quantenoptik
- Raum: Hörsaal, Raum B 0.32 / New lecture hall, Room B 0.32
- Gastgeber: MPQ, Laser Spectroscopy Division
Even more striking phenomena exist in rotating superfluid. A normal, usual liquid in a rotating vessel rotates as a solid body and its surface takes shape of well-known meniscus. It was suggested by Onsager (1949) and Feynman (1954) that a superfluid rotates around of singular quantum vortexes in such a way that the circulation of velocity of a superfluid around a vortex is quantized. It gives possibility to measure the Planck constant in a simple mechanical experiment.
Another quantum state of matter – the Bose-Einstein condensation – was predicted by Einstein in 1925 and discovered in 1995 by Cornell, Wieman and Ketterle. Bose-Einstein condensed gases are superfluid and, as was shown by Bogolyubov (1947), a microscopic theory can be developed in great detail due to the weakness of interaction. Many phenomena can be described in the mean-field approximation by the so called Gross-Pitaevskii theory.
A new possibility were open by creation of strongly interacting, but still dilute, superfluid Fermi liquids.