Mainz 2026 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 64: Poster – Ultra-cold atoms, ions and BEC (joint session A/Q)

Q 64.8: Poster

Donnerstag, 5. März 2026, 17:00–19:00, Philo 1. OG

Stabilizing binary Bose droplets by ions — •Shunsuke Nishimura, Panagiotis Giannakeas, and Jan-Michael Rost — Max Planck Institute for the Physics of Complex Systems, Dresden, Germany

Ultra-dilute liquid droplets formed in binary Bose mixtures constitute weakly interacting yet self-bound quantum fluids, whose quantum-fluctuation-induced stability continues to attract considerable interest. Impurities offer a versatile probe of these systems, and ionic impurities in particular can induce pronounced structural changes through their long-range interactions, as seen in helium nanodroplets. However, their effects in ultra-dilute environments, such as Bose droplets, remain greatly unexplored.

Here we investigate a three-dimensional, spherically symmetric droplet formed by a two-component Bose mixture with contact interactions in the presence of a single ionic impurity. The attractive ion-atom interaction significantly deforms the ground-state density profile and induces a distinct low-lying breathing mode, which remains stable against self-evaporation over a substantially wider range of particle numbers in contrast to the case of the impurity-free droplets. This suggests that ionic impurities offer the possibility to investigate polarons without altering the droplet state even during elementary excitations.

Keywords: Ionic impurity; BEC mixture; Quantum droplet; Ions; Polarons