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Q: Fachverband Quantenoptik und Photonik
Q 48: Ultra-cold Atoms, Ions and BEC III (joint session A/Q)
Q 48.3: Talk
Thursday, March 14, 2024, 15:00–15:15, HS 1010
Universal Self-Organization Dynamics in a Strongly Interacting Fermi Gas — •Timo Zwettler1,2, Tabea Bühler1,2, Aurélien Fabre1,2, Gaia Bolognini1,2, Victor Helson1,2, Giulia del Pace1,2, and Jean-Philippe Brantut1,2 — 1Institute of Physics, EPFL, Switzerland — 2Center of Quantum Science and Engineering, EPFL, Lausanne, Switzerland
Cavity-coupled many-body systems constitute a new emergent field in condensed matter systems, where complex quantum materials are combined with cavity quantum electrodynamics (cQED) to substantially modify material properties by strong light-matter coupling.
We realize a prototypical cavity quantum material by combining cQED with a strongly interacting Fermi gas, providing an ideal, microscopically controllable platform for the study of collective light-matter coupling in strongly correlated matter. We explore the interplay of strong, short-range collisional interactions in the Bose-Einstein condensate to Bardeen-Cooper-Schrieffer (BEC-BCS) crossover and engineered, long-range cavity-mediated interactions, which arise from a two-photon scattering process in the transversally pumped atom-cavity system.
In recent experiments, we advance our understanding of density-wave ordering by investigating the out-of-equilibrium dynamics following a quench across the quantum phase transition. By observing the photons leaking from the optical cavity, we reveal the universal behaviour of the order parameter dynamics in this driven-dissipative system.
Keywords: cavity quantum material; ultracold atoms; quantum optics; strongly interacting Fermions; cavity quantum electrodynamics