Frankfurt 2006 – wissenschaftliches Programm
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Q: Quantenoptik und Photonik
Q 34: Poster Quantengase
Q 34.1: Poster
Dienstag, 14. März 2006, 16:30–18:30, Labsaal
2D BEC in an optical surface trap — •A. D. Lange1, B. Engeser1, K. Pilch1, A. Jaakkola1, H.-C. Nägerl1, and R. Grimm1,2 — 1Inst. für Experimentalphysik, Uni Innsbruck, Technikerstr. 25, Innsbruck — 2Österreichischen Akademie der Wissenschaften, Otto-Hittmair-Platz 1, Innsbruck
We report on an improved apparatus for the production of a 2D Cs BEC in an optical surface trap. Our goal is to enlarge the BEC compared to the previous setup [1], enabling us to systematically study low dimensional quantum systems. The main part of the new system is a glass cell with a super-polished glass prism inserted and glued in at the bottom, providing optimal optical access and a more accurate and faster control of the magnetic field. The atoms are located a few microns above the dielectric prism surface. Strong confinement in the vertical direction leads to a highly anisotropic potential. The implementation of a spatially scanning laser trap allows compression and the controlled excitation of the atomic sample. Sisyphus- and Raman sideband cooling are applied to reach temperatures of a few $∖mu$K. We further increase the phase-space density via evaporative cooling techniques, which cool down the vertical motion of the atoms to the ground state. A recent experiment, in collaboration with another setup for the production of a Cs BEC, provides first experimental evidence for the existence of Efimov states [2].
∖Zitat{1}{D. Rychtarik et al., Phys. Rev. Lett. 92, 173003 (2004)} ∖Zitat{2}{T. Kraemer et al., submitted}