A theoretical analysis of the low energy surface excitations of quantum droplets formed by binary mixtures of ultracold dilute Bose gases is performed. Reliable expressions for the surface tension of the droplets are introduced based on the Thouless variational theorem. The Weber number can then be calculated as a measure of the relative importance of the inertia of the fluid in terms of the kinetic energy compared to its surface tension. By numerically evaluating the evolution of the droplets under the extended Gross-Pitaevskii equation, several regimes on the outcomes of frontal collisions of quantum droplets are identified. They range from the coalescence of the quantum droplets to their disintegration into smaller droplets. Those regimes are shown to be directly correlated to the Weber number. The numerical simulations include atoms losses of the droplets derived from self- evaporation and three--body scattering for both homo-- and hetero--nuclear mixtures.
|Presenter name||Rocio Jauregui|
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