Self-Evaporation Dynamics of Quantum Droplets in a 41K-87Rb Mixture

Abstract

We theoretically investigate the self-evaporation dynamics of quantum droplets in a 41K-87Rb mixture, in free-space. The dynamical formation of the droplet and the effects related to the presence of three-body losses are analyzed by means of numerical simulations. We identify a regime of parameters allowing for the observation of the droplet self-evaporation in a feasible experimental setup.

Weber number and the outcome of binary collisions between quantum droplets

“…1 the results of a numerical calculation of f (z, u, x) and the result of using the approximate expression Eq. ( 46 approximates that expected for homo-nuclear binary mixtures of 39 K under feasible experimental conditions [3,4] (a aa = a bb = 48.57a 0 , a ab = −51.86a 0 ), or hetero-nuclear binary mixtures of 41 K and 87 Rb, also under feasible experimental conditions [6] (a KK = 62.0a 0 , a RbRb = 100.4a 0 and a KRb = −82.0a 0 ). Notice the small relative value of the imaginary part of f with respect to the real one; this fact is frequently used to consider a Hermitean EGPE obtained by just neglecting the imaginary terms derived from f .…”

“…Experimental results have already been reported for mixtures of 41 K and 87 Rb [6], for scattering lengths a KK = 62.0a 0 , a RbRb = 100.4a 0 , respectively. In those experiments, the interspecies scattering length was explored in the interval a KRb (−95, −72)a 0 , and the observed binary mixtures satisfy N (Rb) /N (K) ∼ 1.15.…”

Formation and quench of homonuclear and heteronuclear quantum droplets in one dimension

“…Their self evaporation due to lossy inelastic collisions [7,9] that prevent droplet observation at long timescales, has also been considered. This is a process that can be delayed using heteronuclear mixtures [10,17] or supressed using one-dimensional (1D) settings [18,19]. These recent developments clearly underscore the relevance of such structures in a wide range of theoretical and experimental studies and their interest in quantifying the interplay between mean-field and quantum effects.…”

Manifestation of relative phase in dynamics of two interacting Bose-Bose droplets

“…The life-time of droplets is limited by three-body losses, but in heteronuclear mixtures of 87 Rb and 41 K [13] it might exceed 100 ms [14], which is much longer than the life-time of two-component homonuclear mixtures. Therefore experiments with hetero-nuclear droplets [13] pave a way towards long-lived binary droplets which in turn opens the possibility to study dynamical situations, such as collisions.…”