Self-bound clusters of one-dimensional fermionic mixtures

TL;DR

This paper investigates the formation of self-bound one-dimensional fermionic clusters in ultracold mixtures, revealing that mixtures with three or more fermion types can form stable droplets, with stability influenced by confinement strength.

Contribution

It demonstrates the conditions under which SU(6) x SU(2) fermionic mixtures form self-bound droplets, highlighting the role of multiple fermion types and confinement effects.

Findings

Mixtures with two spin types are not self-bound.

Mixtures with at least three fermion types form stable small droplets.

Universal behavior observed in clusters under tight confinement.

Abstract

Diffusion Monte Carlo calculations on the possibility of having self-bound one-dimen\-sional droplets of SU(6) $\times$ SU(2) ultracold fermionic mixtures are presented. We found that, even though arrangements with attractive interactions with only two spin types are not self-bound, mixtures with at least three kinds of fermions form stable small drops. However, that stabilization decreases for very tight confinements, where a universal behavior is found for Fermi-Fermi and Fermi-Boson clusters including attractive and repulsive interactions.