Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 17: Quantum gases (Bosons) III
Q 17.1: Talk
Tuesday, March 10, 2020, 14:00–14:15, e214
Implanting fermionic 6Li impurities in a Bose-Einstein condensate of 133Cs — •Eleonora Lippi1, Binh Tran1, Manuel Gerken1, Lauritz Klaus1, Bing Zhu1,2, Moritz Drescher3, Tilman Enss3, and Matthias Weidemüller1,2 — 1Physikalisches Institut, Universität Heidelberg, Im Neuenheimer Feld 226, 69120 Heidelberg, Germany — 2Shanghai Branch, University of Science and Technology of China, Shanghai 201315, China — 3Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 19, 69120, Heidelberg, Germany
Fermionic 6Li impurities in a 133Cs Bose-Einstein condensate (BEC) realizes a very well controllable version of the Bose polaron, a quasi-particle emulating the Fröhlich polaron problem of solid-state physics. The large mass imbalance between the two species represents the key ingredient to access intriguing aspects of both dynamics and ground-state properties of the Bose polaron. Nevertheless, the large differential gravitational sag between Li and Cs makes its preparation quite challenging.
I will describe the experimental realization of a stable BEC of Cs atoms at high magnetic field (>880 G), where, a broad Feshbach resonance between Li and Cs allows to control the kind and the strength of interactions. Sympathetic cooling has also been observed with Li playing the role of coolant for Cs. A tightly confining movable optical dipole trap at the tune out wavelength of 880.25 nm for Cs allows to confine a cloud of Li in a small volume inside the BEC without imposing additional confinement to Cs.