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A: Fachverband Atomphysik

A 28: Poster Session - Atomic Physics IV

A 28.7: Poster

Donnerstag, 12. März 2020, 16:00–18:00, Empore Lichthof

Ultracold interaction between a single Ba⁺-ion and spin-polarized Li — •Fabian Thielemann¹, Pascal Weckesser¹, Daniel Hoenig¹, Kai Lok Lam¹, Markus Debatin^{1, 2}, Leon Karpa¹, and Tobias Schaetz¹ — ¹Physikalisches Institut, Albert-Ludwigs Universität Freiburg — ²Institut für Physik, Universität Kassel

The fields of ultracold atoms and trapped ions are important pillars of experimental quantum optics. Recently the expertise of both fields has been combined in hybrid trapping setups to prepare atom-ion mixtures at low temperatures. For joint systems features like Feshbach resonances at magnetic fields on the order of tens of Gauss and the formation of mesoscopic, weakly bound molecules have been predicted. As a first step towards this regime, reaching temperatures on the order of few µK in the combined system is necessary.

Here we present results of a single Ba⁺-ion immersed in a cloud of fermionic Li. We observe that, depending on parameters such as the density of the atomic gas or the intensity of present light fields, the ion either undergoes chemical reactions or elastic collisions that result in sympathetic cooling. Further, we present a method that we developed to deterministically prepare a single ion in an rf or optical trap. In this method we make use of state dependent potentials in optical traps to eject selected ions from the trap.