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Observation of interspecies Feshbach resonances in an ultracold K-Cs mixture and refinement of interaction potentials
Michael Gröbner, Philipp Weinmann, Emil Kirilov +4
We observe interspecies Feshbach resonances due to s-wave bound states in ultracold K-Cs scattering for three different spin mixtures. The resonances are observed as…
Degenerate Raman sideband cooling of 39K
Michael Gröbner, Philipp Weinmann, Emil Kirilov +1
We report on the first realization of sub-Doppler laser cooling of 39K atoms using degenerate 3D Raman sideband cooling. We take advantage of the well-resolved excited hyperfine st…
A new quantum gas apparatus for ultracold mixtures of K and Cs and KCs ground-state molecules
Michael Gröbner, Philipp Weinmann, Florian Meinert +3
We present a new quantum gas apparatus for ultracold mixtures of K and Cs atoms and ultracold samples of KCs ground-state molecules. We demonstrate the apparatus' capabilities by p…
Resonant atom-dimer collisions in cesium: Testing universality at positive scattering lengths
Alessandro Zenesini, Bo Huang, Martin Berninger +3
We study the collisional properties of an ultracold mixture of cesium atoms and dimers close to a Feshbach resonance near 550G in the regime of positive -wave scattering lengths…
Ultracold dense samples of dipolar RbCs molecules in the rovibrational and hyperfine ground state
Tetsu Takekoshi, Lukas Reichsöllner, Andreas Schindewolf +6
We produce ultracold dense trapped samples of 87Rb133Cs molecules in their rovibrational ground state, with full nuclear hyperfine state control, by stimulated Raman adiabatic pass…
Preparation and spectroscopy of a metastable Mott insulator state with attractive interactions
Manfred J. Mark, Elmar Haller, Katharina Lauber +5
We prepare and study a metastable attractive Mott insulator state formed with bosonic atoms in a three-dimensional optical lattice. Starting from a Mott insulator with Cs atoms at…