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A: Fachverband Atomphysik

A 25: Poster IV

A 25.6: Poster

Mittwoch, 13. März 2024, 17:00–19:00, Tent A

Collisional energy effects on atom-ion Feshbach resonances — •Joachim Siemund¹, Fabian Thielemann¹, Daniel Hönig¹, Wei Wu¹, Krzysztof Jachymski², Thomas Walker^1,3, and Tobias Schätz¹ — ¹Physikalisches Institut, Albert-Ludwigs Universität Freiburg — ²Faculty of Physics, University of Warsaw — ³Blackett Laboratory, Imperial College, London

We investigate the inelastic loss dynamics around Feshbach resonances between neutral atoms and ions depending on the collision energy. By immersing a single ¹³⁸Ba⁺ ion in an ultracold cloud of ⁶Li, we have demonstrated the enhancement of two- and three-body interactions through changes in the ion’s electronic state and radial kinetic energy. We probe the atom-ion interaction rate while tuning the ion’s kinetic energy and atomic cloud temperature. We observe the enhancement and suppression of inelastic loss processes depending on the collision energies and specific Feshbach resonance. This energy dependence could provide insight into the fundamental nature of the interaction dynamics, which also will be discussed in a parallel talk by Fabian Thielemann.

Keywords: Fano-Feshbach; Ultracold; Barium; Lithium; Hybrid