QUANTUM OPTICS SEMINAR Title: Optical Cooling of bosonic cesium and fermionic lithium Speaker: Romain Müller, Heidelberg University, Physikalisches Institut Time: Friday, November 11 at 10:15 Room: 1525-323 Abstract: The ability to precisely control the interactions in a Bose-Fermi mixture of 133Cs and 6Li at phase-space densities close to quantum degeneracy results in the opportunity to study many different aspects of few- and many body physics in a system with the highest mass imbalance between stable alkali atoms. Concerning few body effects, the extremely large mass-difference of Li and Cs results in the smallest scaling factor of all alkali combinations for the appearance of universal Efimov states of 4.88 (in comparison to 22.7 for homo-nuclear mixtures) for 133Cs2 6Li. A precise control over the scattering length via magnetic fields (i.e. Feshbach resonances) enables the observation of a large series of these trimer states [1] [2]. Additionally, LiCs dimers are particularly promising candidates for observing dipolar effects, as it possesses the largest dipole moment of 5.5 Debye of all alkali dimers [3]. The talk presents the current developments of our experimental setup focusing on magneto-optically trapped 6Li and the optical dipole trap for 133Cs. References [1] E. Braaten and H.-W. Hammer, AnnPhys 322, 120 (2007) [2] K. Helfrich et al., PRA 81, 042715 (2010) [3] J. Deiglmayr et al., Phys. Rev. A 82, 032503 (2010) Jan Arlt