Dissociation of ultracold molecules with Feshbach resonances

TL;DR

This paper demonstrates a method to measure Feshbach resonance widths in ultracold 87Rb molecules through controlled dissociation, even amidst magnetic noise, and shows how to generate quasi-mono-energetic atomic waves.

Contribution

It introduces a novel approach to accurately determine Feshbach resonance widths using dissociation energy measurements in ultracold molecules.

Findings

Successfully measured widths of 4 Feshbach resonances in 87Rb

Method remains effective despite magnetic-field noise

Created quasi-mono-energetic atomic waves by magnetic field jumps

Abstract

Ultracold molecules are associated from an atomic Bose-Einstein condensate by ramping a magnetic field across a Feshbach resonance. The reverse ramp dissociates the molecules. The kinetic energy released in the dissociation process is used to measure the widths of 4 Feshbach resonances in 87Rb. This method to determine the width works remarkably well for narrow resonances even in the presence of significant magnetic-field noise. In addition, a quasi-mono-energetic atomic wave is created by jumping the magnetic field across the Feshbach resonance.