Stuttgart 2012 – wissenschaftliches Programm
Q 35.16: Poster
Mittwoch, 14. März 2012, 16:30–19:00, Poster.I+II
Exploring cavity-mediated long-range interactions in a dilute quantum gas — •Rafael Mottl, Kristian Baumann, Renate Landig, Ferdinand Brennecke, Tobias Donner, and Tilman Esslinger — Quantum Optics Group, ETH Zurich, Switzerland
We create a Bose-Einstein condensate with long-range atom-atom interactions which are mediated by the vacuum field of an optical cavity. These long-range interactions lead to a phase transition (equivalent to the Dicke quantum phase transition) between a normal and a supersolid phase, where the atoms arrange on a checkerboard lattice. We report on the observation of a characteristic change in the excitation spectrum and increased density fluctuations due to the long-range interactions. The openness of the cavity allows for time-resolved information about the density fluctuations.