Van der Waals universality in homonuclear atom-dimer elastic collisions

TL;DR

This paper investigates the universal features of atom-dimer elastic collisions influenced by van der Waals forces, revealing that resonances are linked to excited Efimov states and showing agreement across different potential models.

Contribution

It demonstrates that atom-dimer resonances are exclusively associated with excited Efimov states and confirms the universality of these features across various van der Waals potential models.

Findings

Resonances are linked to excited Efimov states.

Agreement between soft-core and pure van der Waals potentials for resonances.

Universal features persist across different potential models.

Abstract

The universal aspects of atom-dimer elastic collisions are investigated within the framework of Faddeev equations. The two-body interactions between the neutral atoms are approximated by the separable potential approach. Our analysis considers a pure van der Waals potential tail as well as soft-core van der Waals interactions permitting us in this manner to address the universally general features of atom-dimer resonant spectra. In particular, we show that the atom-dimer resonances are solely associated with the {\it excited} Efimov states. Furthermore, the positions of the corresponding resonances for a soft-core potentials with more than 5 bound states are in good agreement with the corresponding results from an infinitely deep pure van der Waals tail potential.