SAMOP 2021 – scientific programme

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A: Fachverband Atomphysik

A 13: Quantum Gases and Matter Waves (joint session Q/A)

A 13.10: Poster

Tuesday, September 21, 2021, 16:30–18:30, P

Mixing fermionic ⁶Li impurities with a Bose-Einstein condensate of ¹³³Cs — •Binh Tran, Eleonora Lippi, Manuel Gerken, Michael Rautenberg, Marcia Kroker, Lauriane Chomaz, and Matthias Weidemüller — Physikalisches Institut, Universität Heidelberg, Im Neuenheimer Feld 226, 69120 Heidelberg, Germany

Fermionic ⁶Li impurities in a ¹³³Cs Bose-Einstein condensate (BEC) realize a very well controllable version of the Bose polaron, a quasi-particle emulating the Fröhlich polaron problem as known from solid-state physics. I will describe our upgraded scheme for trapping and combining degenerate gases of Li and Cs. We create a BEC of Cs atoms at high magnetic fields (>880 G), where a broad Feshbach resonance between Li and Cs allows to control the sign and the strength of interactions. By means of two crossed optical dipole traps of vastly different volumes, we make use of an efficient "dimple-trick" to increase the phase-space density, which we describe both theoretically and experimentally, before performing forced evaporative cooling. A tightly confining movable optical dipole trap of 880.25 nm wavelength, which realizes a tune-out wavelength for Cs, allows to store, move, and confine a Li cloud within a small volume of the Cs BEC without imposing any additional confinement to Cs.