The study of collective excitations in superfluids systems has been an active and important research topic since the very beginning of the exploration of quantum fluids. Their study offers the possibility of probing several important properties of these systems, such as the spectrum of excitations, or the equation of state.
Here we present our work on the observation and study of Faraday waves in a cigar-shaped Fermi superfluid composed by a two-component spin mixture of $^6$Li atoms. These waves are a type of collective excitation that arises as a periodic spatial and temporal modulation of the gas density profile.
In our setup, Faraday waves are parametrically excited by modulating the radial frequency of the trap. We characterize the phenomenon as a function of the interaction parameter by means of a Feshbach resonance. We probe the superfluid excitation spectrum by extracting an effective 1D speed of sound for different values of the interaction parameter, in good agreement with numerical simulations. Finally, we perform a stability analysis in the parameter space using a simplified model and we show the emergence of the Faraday waves as unstable solutions to a Mathieu-like equation
|Presenter name||Jorge Amin Seman Harutinian|
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