Kai Dieckmann

Quantum Degenerate Two-Species Fermi-Fermi Mixture Coexisting with a Bose-Einstein Condensate

We report on the generation of a quantum degenerate Fermi-Fermi mixture of two different atomic species. The quantum degenerate mixture is realized employing sympathetic cooling of fermionic 6Li and 40K gases by an evaporatively cooled bosonic 87Rb gas. We describe the combination of trapping and cooling methods that proved crucial to successfully cool the mixture. In particular, we study the last part of the cooling process and show that the efficiency of sympathetic cooling of the 6Li gas by 87Rb is increased by the presence of 40K through catalytic cooling. Because of the differing physical properties of the two components, the quantum degenerate 6Li-40K Fermi-Fermi mixture is an excellent candidate for a stable, heteronuclear system allowing the study of several so far unexplored types of quantum matter.

Ultracold Heteronuclear Fermi-Fermi Molecules

We report on the first creation of ultracold bosonic heteronuclear molecules of two fermionic species, 6Li and 40K, by a magnetic field sweep across an interspecies s-wave Feshbach resonance. This allows us to associate up to 4x10(4) molecules with high efficiencies of up to 50%. Using direct imaging of the molecules, we measure increased lifetimes of the molecules close to resonance of more than 100 ms in the molecule-atom mixture stored in a harmonic trap.

Two-stage magneto-optical trapping and narrow-line cooling ofLi6atoms to high phase-space density

We report an experimental study of peak and phase-space density of a two-stage magneto-optical trap (MOT) of 6-Li atoms, which exploits the narrower

Simultaneous magneto-optical trapping of three atomic species

2S_{1/2}\rightarrow 3P_{3/2}

s-Wave Interaction in a Two-Species Fermi-Fermi Mixture at a Narrow Feshbach Resonance

ultra-violet (UV) transition at 323 nm following trapping and cooling on the more common D2 transition at 671 nm. The UV MOT is loaded from a red MOT and is compressed to give a high phase-space density up to

Erratum:s-Wave Interaction in a Two-Species Fermi-Fermi Mixture at a Narrow Feshbach Resonance [Phys. Rev. Lett.105, 123201 (2010)]

3\times 10^{-4}

Erratum: Ultracold Heteronuclear Fermi-Fermi Molecules

. Temperatures as low as 33

Comparison of an efficient implementation of gray molasses to narrow-line cooling for the all-optical production of a lithium quantum gas

\mu

Efficient implementation of a gray optical molasses for sub-Doppler cooling of lithium-6 atoms

K are achieved on the UV transition. We study the density limiting factors and in particular find a value for the light-assisted collisional loss coefficient of

Stability of a frequency-comb-based transfer-lock using a passive Fabry-Perot resonator and its application to spectroscopy of ultracold molecules

1.3 \pm0.4\times10^{-10}\,\textrm{cm}^3/\textrm{s}