Properties of universal bosonic tetramers

TL;DR

This paper investigates the properties of universal bosonic tetramers, revealing their existence, characteristics, and impact on scattering processes in ultracold atomic systems with high precision.

Contribution

It provides high-accuracy calculations of tetramer properties and uncovers their resonant effects in ultracold atom-trimer collisions, advancing understanding of four-boson systems.

Findings

Universal shallow tetramer intersects atom-trimer threshold twice

Tetramers influence atom-trimer and dimer-dimer scattering observables

Resonant effects observed in ultracold collisions

Abstract

The system of four identical bosons is studied using momentum-space equations for the four-particle transition operators. Positions, widths and existence limits of universal unstable tetramers are determined with high accuracy. Their effect on the atom-trimer and dimer-dimer scattering observables is discussed. We show that a universal shallow tetramer intersects the atom-trimer threshold twice leading to resonant effects in ultracold atom-trimer collisions.