Preparation of a pure molecular quantum gas.
An ultracold molecular quantum gas is created by application of a magnetic field sweep across a Feshbach resonance to a Bose-Einstein condensate of cesium atoms. The ability to separate the molecules from the atoms permits direct imaging of the pure molecular sample. Magnetic levitation enables study of the dynamics of the ensemble on extended time scales. We measured ultralow expansion energies in the range of a few nanokelvin for a sample of 3000 molecules. Our observations are consistent with the presence of a macroscopic molecular matter wave.
Herbig
Jens
J
Institut für Experimentalphysik, Universität Innsbruck, Technikerstrabetae 25, 6020 Innsbruck, Austria.
Kraemer
Tobias
T
Mark
Michael
M
Weber
Tino
T
Chin
Cheng
C
Nägerl
Hanns-Christoph
HC
Grimm
Rudolf
R