Bonn 2025 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 27: Poster – Ultra-cold Atoms, Ions and BEC (joint session A/Q)

Q 27.20: Poster

Dienstag, 11. März 2025, 14:00–16:00, Tent

Atom-ion Feshbach resonances within a spin-mixed atomic bath — •Jonathan Grieshaber¹, Joachim Siemund¹, Fabian Thielemann¹, Kilian Berger¹, Wei Wu¹, Krzysztof Jachymski², and Tobias Schätz¹ — ¹Physikalisches Institut, Albert-Ludwigs Universität Freiburg — ²Faculty of Physics, University of Warsaw

Exploring particle interactions lies at the core of physics and chemistry. Feshbach resonances allow us to control atomic binding processes at the quantum level. In our hybrid atom-ion setup, we manipulate the interaction between a cloud of ultracold ⁶Li in an optical dipole trap and a ¹³⁸Ba⁺ ion in a linear Paul trap. We measure and analyze the effects of mixing Lithium spin states on the interaction and pseudo-molecular formation between atom and ion. Our findings offer valuable insights into the predictive capability of an adapted theoretical two-step quantum recombination model for molecular formation already partially established for Feshbach resonances in neutral atoms.

Keywords: Fano-Feshbach; ultracold; Barium; Lithium; hybrid