Exploring an ultracold Fermi-Fermi mixture: Interspecies Feshbach resonances and scattering properties of 6Li and 40K

TL;DR

This paper investigates Feshbach resonances in an ultracold mixture of 6Li and 40K fermions, providing detailed characterization of scattering properties and resonance assignments using experimental data and theoretical models.

Contribution

It reports the first observation and detailed analysis of interspecies Feshbach resonances in a 6Li-40K mixture, combining experimental results with theoretical interpretation.

Findings

Identification of multiple s- and p-wave Feshbach resonances

Characterization of ground-state scattering properties

Agreement between experimental data and theoretical models

Abstract

We report on the observation of Feshbach resonances in an ultracold mixture of two fermionic species, 6Li and 40K. The experimental data are interpreted using a simple asymptotic bound state model and full coupled channels calculations. This unambiguously assigns the observed resonances in terms of various s- and p-wave molecular states and fully characterizes the ground-state scattering properties in any combination of spin states.