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Q: Fachverband Quantenoptik und Photonik

Q 21: Ultracold Atoms and Plasmas (joint session Q/A)

Q 21.7: Poster

Tuesday, March 15, 2022, 16:30–18:30, P

Erbium-Lithium: Towards a new mixture experiment — •Florian Kiesel, Alexandre De Martino, and Christian Groß — Eberhard Karls Universität Tübingen, Physikalisches Institut, Auf der Morgenstelle 14, 72076 Tübingen

Ultra cold fermions can not be cooled below 10% of the Fermi temperature efficiently. Sympathetic cooling with a classical gas as an entropy reservoir may provide a new direction to overcome the current limit. Testing this approach, we are building a new two species ultra cold quantum gas experiment. Its goal is to overlap fermionic lithium and bosonic erbium using a dipole trap at a tune-out wavelength. Doing this, we are planning to trap and cool both species separately. Transporting the atoms into the science chamber will be done optically, but aided by magnetic levitation. In the course of this, a transport distance of up to 1 m has to be demonstrated. The following sympathetic cooling by an intentionally kept classical erbium gas of the lithium cloud, enables to overcome the limiting factor of exponentially rising thermalization time of spin-mixture cooling. There, the great mass imbalance does not only help to cool lithium more efficiently, but it also gives rise to the chance of exploring polaron and impurity physics. In the future using the interspecies Feshbach resonances, this mixture could allow to exhibit in process cooling of qubits to stabilize long sequences of gate operations.