Mainz 2026 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 17: Ultra-cold Atoms, Ions and BEC II (joint session A/Q)

A 17.5: Vortrag

Mittwoch, 4. März 2026, 15:45–16:00, N 1

Ultracold mixture of erbium and lithium atoms — •Kirill Karpov, Alexandre De Martino, Florian Kiesel, Jonas Auch, Eduard Heidt, and Christian Gross — Eberhard Karls Universitaet Tuebingen, Tuebingen, Germany

The extreme mass imbalance between Er and Li offers a unique platform for exploring impurity physics and emergent many-body phenomena. In this experiment, we produce a mixture of ¹⁶⁶Er and ⁶Li. We achieve Bose-Einstein condensation for erbium via evaporative cooling, while lithium is sympathetically cooled by the erbium. Furthermore, the tune-out wavelength of Er enables species-selective confinement. This allows for the far-detuned conservative trapping of Li without perturbing the Er background. Such species-selective trapping schemes open a new level of control in mixture experiments, paving the way for studying the properties of moving Bose polarons.

Keywords: quantum gases; ultracold atoms; bose polaron