Juris Ulmanis

Observation of Efimov resonances in a mixture with extreme mass imbalance.

We observe two consecutive heteronuclear Efimov resonances in an ultracold Li-Cs mixture by measuring three-body loss coefficients as a function of magnetic field near a Feshbach resonance. The first resonance is detected at a scattering length of a_((0))=-320(10)a_((0)), corresponding to ∼7(∼3) times the Li-Cs (Cs-Cs) van der Waals range. The second resonance appears at 5.8(1.0)a_((0)), close to the unitarity-limited regime at the sample temperature of 450 nK. Indication of a third resonance is found in the atom loss spectra. The scaling of the resonance positions is close to the predicted universal scaling value of 4.9 for zero temperature. Deviations from universality might be caused by finite-range and temperature effects, as well as magnetic field-dependent Cs-Cs interactions.

Ultracold Molecules Formed by Photoassociation: Heteronuclear Dimers, Inelastic Collisions, and Interactions with Ultrashort Laser Pulses

Dimers, Inelastic Collisions, and Interactions with Ultrashort Laser Pulses Juris Ulmanis,† Johannes Deiglmayr,‡ Marc Repp,† Roland Wester, and Matthias Weidemüller*,† †Physikalisches Institut, Ruprecht-Karls-Universitaẗ Heidelberg, Philosophenweg 12, 69120 Heidelberg, Germany ‡Laboratorium für Physikalische Chemie, ETH Zürich, Wolfgang-Pauli-Strasse 10, 8093 Zürich, Switzerland Institut für Ionenphysik und Angewandte Physik, Universitaẗ Innsbruck, Technikerstrasse 25/3, 6020 Innsbruck, Austria

Observation of interspecies6Li-133Cs Feshbach resonances

We report on the observation of 19 interspecies Feshbach resonances in an optically trapped ultracold Bose-Fermi mixture of

Heteronuclear Efimov Scenario with Positive Intraspecies Scattering Length.

{}^{133}\text{Cs}

Universal three-body recombination and Efimov resonances in an ultracold Li-Cs mixture

and

Universality of weakly bound dimers and Efimov trimers close to Li–Cs Feshbach resonances

{}^{6}\text{Li}

Role of the intraspecies scattering length in the Efimov scenario with large mass difference

in the two energetically lowest spin states. We assign the resonances to

Analyzing Feshbach resonances: A 6 Li - 133 Cs case study

s

Universality of Li-Cs-Cs Efimov Resonances

- and

Finite-Range Effects in Li-Cs-Cs Efimov Resonances

p