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A: Fachverband Atomphysik

A 20: Poster II

A 20.13: Poster

Mittwoch, 8. März 2023, 16:30–19:00, Empore Lichthof

Producing large and stable magnetic fields for Feshbach resonance experiments in a ⁶Li - ¹³⁸Ba⁺ hybrid system. — •Wei Wu, Fabian Thielemann, Joachim Siemund, Thomas Walker, and Tobias Schaetz — Physikalisches Institut Albert-Ludwigs-Universität Freiburg Hermann-Herder-Str. 3 79104 Freiburg

For many ultra-cold physics experiments, such as those involving Feshbach resonances, both a high magnetic field strength (> 100 G) and low noise (< 100 mG) are needed. Further, the coils should be compact enough to fit with the experiment. Here we present our Bitter electromagnet configuration for the Feshbach resonances experiments in the atom-ion hybrid system[1,2], and characterize its performance. Meanwhile, we investigate the field’s short- and long-term stability with Ramsey spectroscopy of ⁶Li, discuss plans for improvements to the system.

[1] Weckesser P, Thielemann F, Wiater D, et al. Observation of Fes- hbach resonances between a single ion and ultracold atoms[J]. Nature, 2021, 600(7889): 429-433.

[2] Schmidt J, Weckesser P, Thielemann F, et al. Optical traps for sympathetic cooling of ions with ultracold neutral atoms[J]. Physical review letters, 2020, 124(5): 053402.