Bonn 2025 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

Q: Fachverband Quantenoptik und Photonik

Q 16: Ultra-cold atoms, ions and BEC I (joint session A/Q)

Q 16.4: Vortrag

Montag, 10. März 2025, 18:00–18:15, KlHS Mathe

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

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 interactions near a resonance depend on parameters such as the collision energy or the spin admixture of the bath. We compare experimentally observed three-body loss rates to predictions of an adapted two-step quantum recombination model. These results provide valuable insights into the microscopic mechanisms of dimer formation in atom-ion systems.

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