Berlin 2005 – wissenschaftliches Programm
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Q: Quantenoptik und Photonik
Q 2: Poster Quantengase
Q 2.1: Poster
Freitag, 4. März 2005, 11:00–12:30, Poster HU
A second generation Cs BEC experiment — •Mattias Gustavsson, Peter Unterwaditzer, Anton Flir, and Hanns-Christoph Nägerl — Institut für Experimentalphysik, Universität Innsbruck
We present a new experiment currently under construction in Innsbruck. A Cs BEC [1] will be produced in a glass cell apparatus, allowing maximum optical access and rapid switching of magnetic fields. A high loading rate and a large-volume optical dipole trap at near infra-red wavelengths together with optimized 3D Raman sideband cooling should allow for large condensates with more than 106 atoms.
We plan to load the BEC into a 3D optical lattice. With precisely two or three atoms per site and s-wave interactions tunable through Feshbach resonances at low magnetic fields, it will be possible to explore weakly and strongly interacting atoms in the lattice and to study collisions and molecule formation [2] in a very controlled environment. The formation of a molecular BEC made out of bosonic constituents might be stabilized with help of the lattice. A further possible application is the measurement of clock shifts.
Another interesting possibility is to study the regime of zero scattering length. A BEC without perturbing mean-field shifts is ideally suited for atom interferometry and precision measurements. For example, it is possible to determine the fine structure constant α via measurement of the photon recoil [3].
[1] T. Weber et al., Science 299, 232 (2003)
[2] J. Herbig et al., Science 301, 1510 (2003)
[3] S. Gupta et al., Phys. Rev. Lett. 89 140401 (2002)