Bonn 2025 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 27: Poster – Ultra-cold Atoms, Ions and BEC (joint session A/Q)
Q 27.24: Poster
Tuesday, March 11, 2025, 14:00–16:00, Tent
Exploring atom-ion Feshbach resonances below the s-wave limit — •Kilian Berger1, Joachim Siemund1, Fabian Thielemann1, Jonathan Grieshaber1, Daniel von Schönfeld1, Wei Wu1, Pascal Weckesser2, Krzysztof Jachymski3, Thomas Walker4, and Tobias Schätz1 — 1Faculty of Physics, University of Freiburg — 2Max Planck Institute of Quantum Optics, Garching — 3Faculty of Physics, University of Warsaw — 4Blackett Larboratory, Imperial College London
Understanding quantum dynamics at the level of individual particles requires precise control over both, electronic and motional degrees of freedom. Trapped atomic ions have long been valuable in this area, though they are limited in studying collective properties. A novel approach that integrates a single ion with ultracold atoms opens up opportunities to investigate phenomena ranging from single-particle to many-body physics. In our experiment, we immerse a single 138Ba+ ion in an ultracold gas of 6Li atoms to investigate atom-ion Feshbach resonances. We examine how the Feshbach resonances depend on the collision energy. By controlling the ion’s kinetic energy and the temperature of the atomic bath, we observe a variation in inelastic losses at higher collision energies near resonance. These findings offer key experimental insights into the energy dependence of partial-wave interactions in atom-ion systems.
Keywords: Fano-Feshbach; ultracold; Barium; Lithium; hybrid