Rostock 2019 – scientific programme
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A: Fachverband Atomphysik
A 5: Ultra-cold atoms and molecules II (joint session A/MO/Q)
A 5.7: Talk
Monday, March 11, 2019, 15:30–15:45, S HS 1 Physik
Exploring Fermi polarons across an orbital Feshbach resonance — •Nelson Darkwah Oppong1,2, Luis Riegger1,2, Oscar Bettermann1,2, Moritz Höfer1,2, Jesper Levinsen3, Meera M. Parish3, Immanuel Bloch1,2, and Simon Fölling1,2 — 1Ludwig-Maximilians-Universität, München, Germany — 2Max-Planck-Institut für Quantenoptik, Garching, Germany — 3School of Physics and Astronomy, Monash University, Victoria, Australia
Ultracold atoms are a particularly clean system for probing polaronic states of interacting particles. Fermi polarons in particular have been studied with several realizations, all of which were using alkali atoms. Here, we report on the observation of attractive and repulsive Fermi polarons across the orbital Feshbach resonance (OFR) in a two dimensional gas of 173Yb. This novel type of Feshbach resonance allows tuning the s-wave scattering length of atoms in the 1S0 ground state and the metastable 3P0 state. In our experiment, we prepare a spin-imbalanced Fermi gas for various interaction parameters ln(kF a2D) in the vicinity of the OFR. We spectroscopically identify two distinct energy branches corresponding to attractive and repulsive Fermi polarons. In addition, we probe the quasiparticle properties, namely the quasiparticle residue and the lifetime of the repulsive polaron. We find good agreement between the experimental results and the predictions from our many-body theory.