Freiburg 2024 – scientific programme
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A: Fachverband Atomphysik
A 28: Ultra-cold Atoms, Ions and BEC II (joint session A/Q)
A 28.4: Talk
Thursday, March 14, 2024, 11:45–12:00, HS 1098
Collisional energy effects on atom-ion Feshbach resonances — •Fabian Thielemann1, Joachim Siemund1, Daniel Hönig1, Wei Wu1, Krzystof Jachymski2, Thomas Walker1,3, and Tobias Schaetz1 — 1Physikalisches Institut, Albert-Ludwigs Universität Freiburg — 2Faculty of Physics, University of Warsaw — 3Blackett Laboratory, Imperial College, London
Collisions between particles are at the heart of many physical and chemical processes. The ability to control them down to the single quantum level is crucial to understanding the constituents and their interaction. We use our hybrid setup to combine a single Ba138+ ion with a cloud of ultra-cold, spin-polarized Li6 near degeneracy. We investigate the transition from the classical to the quantum regime of collisions and show to what extent individual atom-ion Feshbach resonances of this combination depend on the collisional energy. With the help of a quantum recombination model, we make first steps towards distinguishing between resonances that occur due to different open-channel partial-wave contributions.
Keywords: Fano-Feshbach; Ultracold; Barium; Lithium; Hybrid