Faraday waves in strongly interacting superfluids
Jorge Seman (UNAM)
ABSTRACT:
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 study of Faraday waves in a cigar-shaped Fermi superfluid of 6Li parametrically excited by modulating the radial trap frequency. These waves are a type of collective excitation that arises as a periodic spatial and temporal modulation of the gas density profile.
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.
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The corresponding paper has been recently approved and the online version can be found in the following link (it is an open access journal):
https://iopscience.iop.org/article/10.1088/1367-2630/ac2d70
Notice that this is the approved manuscript, we are currently on the proofs revision process, so this might not be the definitive version of the paper.
Another useful paper can be downloaded for free in the following link (I also attached it into this email), where we describe in detail our experimental setup:
https://rmf.smf.mx/ojs/index.php/rmf/article/view/Vol.%2066%2C%20issue%204%2C%20pp.%20388-403/4843
BIO:
Jorge Seman obtained his bachelor’s degree in physics from the National Autonomous University of Mexico and his PhD in physics from the University of São Paulo, Brazil. He held a position as a postdoctoral fellow for three years at the European Laboratory for Nonlinear Spectroscopy (LENS) and at the National Institute of Optics of the National Research Council (INO-CNR), at the University of Florence, Italy.
He is currently a researcher at the Institute of Physics of the National Autonomous University of Mexico, where he is responsible for the Ultracold Matter Laboratory. In this laboratory, dilute Fermi gases are cooled down to a temperature very close to absolute zero. The current research interests consists in the study of collective excitations in Fermi superfluids across the BEC-BCS crossover.