Rostock 2019 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 42: Poster: Quantum Optics and Photonics II

Q 42.14: Poster

Wednesday, March 13, 2019, 16:15–18:15, S Atrium Informatik

Towards the Bose Polaron: A Bichromatic Optical Trap for Ultracold ⁶Li and ¹³³Cs — •Lauritz Klaus¹, Binh Tran¹, Eleonora Lippi¹, Manuel Gerken¹, Melina Filzinger¹, Bing Zhu^{1, 2}, and Matthias Weidemüller^{1, 2} — ¹Physikalisches Institut, Universität Heidelberg, Im Neuenheimer Feld 226, 69120 Heidelberg, Germany — ²Shanghai Branch, University of Science and Technology of China, Shanghai 201315, China

The polaron quasiparticle, an impurity dressed by phonon modes, is a fundamental concept to understand dynamics in a many-body system. While this theory was originally applied to understand the dynamics of an electron in a lattice, it generalizes to condensed matter as well as atomic physics problems.
In our experiment we immerse a fermionic ⁶Li impurity into a ¹³³Cs Bose-Einstein condensate (BEC). The high mass imbalance allows us not only to investigate the polaron spectrum but it also gives us insights into the influence of few-body effects on the polarons, namely the Efimov effect. Due to the big difference in the gravitational sag of both species we implement a bichromatic trapping potential consisting of a large optical trap to achieve the Cs BEC and a tightly focused, translatable trap (<10 µ m), to transfer and confine the Li cloud inside the BEC and precisely position it to get the highest possible phase space overlap.