# Pathway toward the formation of supermixed states in ultracold boson mixtures loaded in ring lattices

## TL;DR

This paper explores how binary mixtures of ultracold bosons in ring lattices transition from mixed, delocalized states to supermixed, localized states, revealing a common pathway and phase diagram through semiclassical and quantum analyses.

## Contribution

It identifies a universal pathway for the formation of supermixed states in bosonic mixtures and constructs a detailed phase diagram using both semiclassical and quantum methods.

## Key findings

- A common pathway from mixed to supermixed states is identified.
- A bi-dimensional phase diagram with critical lines is constructed.
- Both semiclassical and quantum approaches agree on the transition features.

## Abstract

We investigate the mechanism of formation of supermixed soliton-like states in bosonic binary mixtures loaded in ring lattices. We evidence the presence of a common pathway which, irrespective of the number of lattice sites and upon variation of the interspecies attraction, leads the system from a mixed and delocalized phase to a supermixed and localized one, passing through an intermediate phase where the supermixed soliton progressively emerges. The degrees of mixing, localization and quantum correlation of the two condensed species, quantified by means of suitable indicators commonly used in Statistical Thermodynamics and Quantum Information Theory, allow one to reconstruct a bi-dimensional mixing-supermixing phase diagram featuring two characteristic critical lines. Our analysis is developed both within a semiclassical approach capable of capturing the essential features of the two-step mixing-demixing transition and with a fully-quantum approach.