学术报告    Higgs/amplitude mode and non-equilibrium dynamics of strongly interacting Fermi gases

In this talk, I will show our efforts in exploring Higgs/amplitude mode and non-equilibrium dynamics of strongly interacting Fermi gases of ⁶Li atoms. Firstly, I will show our recent observation of the Higgs mode in a strongly-interacting superfluid Fermi gas. By inducing a periodic modulation of the amplitude of the superconducting order parameter ? with RF field, we observe an excitation resonance at frequency 2?/h. For strong coupling, the peak width broadens and eventually the mode disappears when the Cooper pairs turn into tightly bound dimers signalling the eventual instability of the Higgs mode. Secondly, I will discuss our experiment of the non-equilibrium dynamics of strongly interacting Fermi gases following rapid interaction quenches. With a fast population transfer, the interaction cross the Feshbach resonances between the different spin components is rapidly quenched, which induces non-equilibrium dynamics beyond  prediction of BCS theory.