Ultradilute quantum liquid drops

TL;DR

This paper uses quantum Monte Carlo simulations to explore ultradilute quantum liquid drops formed from Bose-Bose mixtures with attractive interactions, revealing a transition from gas to self-bound liquid in a regime previously unobserved.

Contribution

It provides an exact, non-perturbative study of ultradilute quantum liquids, bridging experimental observations with theoretical modeling.

Findings

Observation of a transition from gas to self-bound liquid drops

Validation of experimental findings with quantum Monte Carlo results

Identification of an ultradilute liquid state not previously observed in nature

Abstract

Using quantum Monte Carlo methods we have studied dilute Bose-Bose mixtures with attractive interspecies interaction in the limit of zero temperature. The calculations are exact within some statistical noise and thus go beyond previous perturbative estimations. By tuning the intensity of the attraction, we observe the evolution of an $N$-particle system from a gas to a self-bound liquid drop. This observation agrees with recent experimental findings and allows for the study of an ultradilute liquid never observed before in Nature.