SAMOP 2021 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 13: Ultra-cold atoms, ions, and BEC (joint session A/Q)
Q 13.20: Poster
Wednesday, September 22, 2021, 16:30–18:30, P
Feshbach resonances in a hybrid atom-ion system — •Wei Wu1, Fabian Thielemann1, Joachim Welz1, 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 first observation of Feshbach resonances between neutral atoms and ions. [1,2] While Feshbach resonances are commonly utilized in neutral atom experiments, however, reaching the ultracold regime in hybrid traps is challenging, as the driven motion of the ion by the rf trap limits the achievable collision energy. [3] We report three-body collisions between neutral 6Li and 138Ba+, where we are able to resolve individual resonances. We demonstrate the enhancement of two-body interactions through an increase in the sympathetic cooling rate of the ion by the atomic cloud, determined through optical trapping of the ion. and molecule formation evidenced by subsequent three-body losses. This paves the way to new applications such as the coherent formation of molecular ions and simulations of quantum chemistry. [4]
[1] Weckesser P, et al. arXiv preprint arXiv:2105.09382, 2021.
[2] Schmidt J, et al. Physical review letters, 2020, 124(5): 053402.
[3] Cetina M, et al. Physical review letters, 2012, 109(25): 253201.
[4] Bissbort U, et al.Physical review letters, 2013, 111(8): 080501.