Scientific Results

Collisions of self bound quantum droplets

Year: 2019

Authors: Ferioli G., Semeghini G., Masi L., Giusti G., Modugno G., Inguscio M., Gallemí A., Recati A., Fattori M.

Autors Affiliation: LENS and Dipartimento di Fisica e Astronomia, Universit`a di Firenze, 50019 Sesto Fiorentino, Italy; CNR Istituto Nazionale Ottica, 50019 Sesto Fiorentino, Italy; INO-CNR BEC Center and Dipartimento di Fisica, Universit`a di Trento, 38123 Povo, Italy: Trento Institute for Fundamental Physics and Applications, INFN, 38123, Trento, Italy

Abstract: We report on the study of binary collisions between quantum droplets formed by an attractive mixture of ultracold atoms. We distinguish two main outcomes of the collision, i.e., merging and separation, depending on the velocity of the colliding pair. The critical velocity vc that discriminates between the two cases displays a different dependence on the atom number N for small and large droplets. By comparing our experimental results with numerical simulations, we show that the nonmonotonic behavior of vcðNÞ is due to the crossover from a compressible to an incompressible regime, where the collisional dynamics is governed by different energy scales, i.e., the droplet binding energy and the surface tension. These results also provide the first evidence of the liquidlike nature of quantum droplets in the large N limit, where their behavior closely resembles that of classical liquid droplets.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 122 (9)      Pages from: 090401-1  to: 090401-5

More Information: Nessuna
KeyWords: Quantum droplets, atomic mixtures.
DOI: 10.1103/PhysRevLett.122.090401

Citations: 25
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