Mainz 2017 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 15: Ultracold atoms and BEC - II (with A)

Q 15.6: Talk

Monday, March 6, 2017, 18:15–18:30, N 1

Non-equilibium BCS state Fermi gas — Alexandra Behrle, Timothy Harrison, •Kuiyi Gao, Martin Link, and Michael Koehl — Physikalisches Institut, University of Bonn, Wegelerstrasse 8, 53115 Bonn, Germany

Ultracold Fermi gases with tunable interactions have been widely used to investigate the BEC-BCS crossover in the last decade and superfluidity of Fermi gases with different interactions have shown a variety of rich physics. So far, the focus of research has mainly been on the equilibrium state of an attractive gas of cooper pairs. Non-equilibrium coherent dynamics of the BCS state was proposed for studying collective modes, pair formation and excitations in superconductivity, however, experimental realization has been hindered by the difficulty of performing fast enough perturbations to the system. In this talk, we will show our efforts in preparing and detecting a non-equilibrium BCS-superfluid of fermionic 6Li atoms. We focus on the coherent dynamics with fast modulation and quenched interactions using fast ramps across the Feshbach resonance.