Agenda

Résumé : Solitons are wave packets that maintain their shape during free propagation, thanks to a non-linearity that prevents the usual spreading. In quantum fluids, this non-linear element is provided by interactions, which can be described by a Gross-Pitaevskii-type equation. In this way, bright and dark solitons are observed for attractive and repulsive interactions, respectively. After describing some of these results, I will turn to mixtures of quantum gases which lead to a richer physics, with the emergence of magnetic solitons and liquid-like states, both of which show rather counterintuitive behaviors.