SAMOP 2023 – wissenschaftliches Programm
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SYAD: Symposium SAMOP Dissertation Prize 2023
SYAD 1: SAMOP Dissertation Prize Symposium (SYAD)
SYAD 1.4: Hauptvortrag
Montag, 6. März 2023, 16:00–16:30, E415
Feshbach resonances in a hybrid atom-ion system — •Pascal Weckesser — Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Straße 3, 79104 Freiburg, Germany
In the past decade, hybrid atom-ion systems have emerged as a new platform featuring long-range interactions. Cooling the system close to the quantum limit allows the investigation of novel quantum phenomena, such as charged mesoscopic molecules, as well as the study of quantum chemistry and quantum simulation. Reaching the ultracold regime, however, is a challenging task, as intrinsic heating effects of conventional radiofrequency (rf) traps limit most experiments to the millikelvin regime, where atom-ion interactions remain classical.
In my talk, I will discuss two pathways to overcome this limitation and present the first observation of Feshbach resonances between atoms and ions. We minimize the intrinsic heating rates by choosing a system with large mass imbalance - 6Li atoms and 138Ba+ ions. Additionally, we can optically trap the ions allowing us to operate in complete absence of detrimental rf fields. As a result, we cool the system to the s- and p-wave scattering regime and find 11 resonances by magnetic-field dependent ion loss spectroscopy. We further demonstrate the tunability of the resonances by controlling the ion’s sympathetic cooling rate. These results pave the way towards studying complex many-body systems, such as charged polarons in the strong coupling regime or the coherent formation of molecular ions.