Erlangen 2022 – scientific programme

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A: Fachverband Atomphysik

A 29: Ultra-cold atoms, ions and BEC (joint session A/Q)

A 29.12: Poster

Thursday, March 17, 2022, 16:30–18:30, P

A moveable tuneout optical dipole trap for ultracold ⁶Li in a ¹³³Cs BEC — •Robert Freund, Binh Tran, Eleonora Lippi, Michael Rautenberg, Tobias Krom, Manuel Gerken, Lauriane Chomaz, and Matthias Weidemüller — Physikalisches Institut, Ruprecht Karls University of Heidelberg, Im Neuenheimer Feld 226, 69120 Heidelberg, Germany

The ultracold Bose-Fermi mixture of ¹³³Cs and ⁶Li is an interesting system which can be used to study different few- and many-body phenomena. By immersing fermionic ⁶Li impurities into a ¹³³Cs Bose-Einstein Condensate (BEC) the energy spectrum of quasiparticles namely Bose polaron can be mapped out. The large mass imbalance between Caesium and Lithium atoms is expected to give a signature of 3-body Efimov effect in the polaron spectrum. In order to obtain a clear polaron signal the optimization of the overlap between the two species in space and momentum is crucial. The Lithium is going to be trapped in a tightly confined optical dipole trap with a beam waist of around 10 µm to adapt to the size of the BEC. Moreover the trap is translatable both to compensate for the gravitational sag due to the large mass difference of the species and to store Lithium far away from Caesium during the preparation and cooling procedures. The trap runs at a tune-out wavelength of Caesium to reduce the influence of the trap on the potential landscape of the BEC as much as possible.