Universal four-body states in heavy-light mixtures with positive scattering length

TL;DR

This paper predicts a new class of universal four-body bound states in heavy-light atomic mixtures with positive scattering length, expanding the understanding of few-body quantum states and their experimental realization.

Contribution

It introduces the prediction of a universal four-body state in heavy-light mixtures with a specific mass ratio and positive scattering length, which was not previously known.

Findings

Existence of a universal four-body bound state for mass ratio $  9.5$

Structural properties of these states are characterized

Finite-range effects are analyzed

Abstract

The number of four-body states known to behave universally is small. This work adds a new class of four-body states to this relatively short list. We predict the existence of a universal four-body bound state for heavy-light mixtures consisting of three identical heavy fermions and a fourth distinguishable lighter particle with mass ratio $\kappa \gtrsim 9.5$ and short-range interspecies interaction characterized by a positive s-wave scattering length. The structural properties of these universal states are discussed and finite-range effects are analyzed. The bound states can be experimentally realized and probed utilizing ultracold atom mixtures.