Erlangen 2022 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 29: Ultra-cold atoms, ions and BEC (joint session A/Q)
A 29.4: Poster
Donnerstag, 17. März 2022, 16:30–18:30, P
Feshbach Resonances in a hybrid Atom-Ion System — •Joachim Welz1, Fabian Thielemann1, Wei Wu1, Thomas Walker1, Pascal Weckesser1,2, Daniel Hönig1, Amir Mohammadi1, and Tobias Schätz1 — 1Albert-Ludwigs-Universität Freiburg, Physikalisches Institut, Hermann-Herder-Straße 3, 79104 Freiburg, Germany — 2Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching, Germany
We present the observation of Feshbach resonances between neutral atoms and ions [1,2]. These resonances - a quantum phenomenon only observable at ultracold temperatures - allow the interaction rate between particles to be tuned with the perspective to even switch them off. While Feshbach resonances are commonly utilized in neutral atom experiments, reaching the ultracold regime in hybrid rf-optical traps is challenging, as the driven motion of the ion by the rf trap limits the achievable collision energy [3]. By immersing a single Ba ion in an ultracold cloud of Li, we demonstrate the enhancement of both two-body and three-body interactions through changes in the ion's internal and motional energy. This paves the way for all-optical trapping of both species, circumventing the fundamental rf-heating, and for new applications, such as the coherent formation of molecular ions and simulations of quantum chemistry [4].
[1] WECKESSER, Pascal, et al. arXiv:2105.09382, 2021.
[2] SCHMIDT, J., et al. Phys.Rev.Lett. 2020, 124-5.
[3] CETINA, Marko et al. Phys.Rev.Lett. 2012, 109-25.
[4] BISSBORT, Ulf, et al. Phys.Rev.Lett. 2013, 111-8.