Weakly bound dimers of fermionic atoms

TL;DR

This paper investigates the properties of weakly bound fermionic atom dimers, providing exact scattering solutions and highlighting their potential for Bose-Einstein condensation due to favorable elastic-inelastic rate ratios.

Contribution

It presents the exact solution for dimer-dimer elastic scattering and analyzes the inelastic decay rates, revealing conditions favorable for Bose-Einstein condensation.

Findings

Elastic scattering cross-section calculated exactly.

Inelastic decay rates decrease with increasing scattering length.

High elastic-to-inelastic rate ratio supports BEC formation.

Abstract

We discuss the behavior of weakly bound bosonic dimers formed in a cold Fermi gas at a large positive scattering length $a$ for the interspecies interaction. We find the exact solution for the dimer-dimer elastic scattering and obtain a strong decrease of their collisional relaxation and decay with increasing $a$. The large ratio of the elastic to inelastic rate is promising for achieving Bose-Einstein condensation of the dimers and cooling the condensed gas to very low temperatures.