Hannover 2020 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 34: Quantum gases (Fermions) II

Q 34.6: Talk

Wednesday, March 11, 2020, 15:30–15:45, e214

Strongly correlated fermions strongly coupled to light — •Hideki Konishi, Kevin Roux, Victor Helson, and Jean-Philippe Brantut — Institute of Physics, EPFL, Lausanne, Switzerland

We demonstrate strong coupling of a strongly interacting Fermi gas with light in a high finesse optical cavity. A quantum degenerate, unitary Fermi gas of lithium-6 is produced inside the cavity mode, and the transmission spectrum of the coupled system is measured. We investigate both a spin-polarized and a spin-balanced gas. In the spin-polarized case the spectrum shows a prominent anti-crossing as the cavity approaches the atomic resonance, a hallmark of strong light-matter coupling. In the spin-balanced case we observe three dressed state branches corresponding to the two internal states, in a regime where the collective Rabi frequency is larger than the hyperfine splitting. Both spectra are in good agreement with ab-initio theoretical calculations. Our system provides complete and simultaneous control over the atom-atom and atom-light interactions. It allows for the implementation of novel light-induced phases of matter as well as continuous measurements of atomic dynamics.