Ramsey fringes in a Bose-Einstein condensate between atoms and molecules

TL;DR

This paper reports on the observation of Ramsey fringes in a Bose-Einstein condensate of rubidium-85, demonstrating oscillations between atomic and molecular states consistent with a resonance field theory.

Contribution

It provides experimental evidence supporting a resonance field theory model for atom-molecule oscillations in a BEC near a Feshbach resonance.

Findings

Observed Ramsey fringes in a $^{85}$Rb BEC.

Oscillation frequency matches molecular binding energy.

Results align with resonance field theory predictions.

Abstract

In a recent experiment, a Feshbach scattering resonance was exploited to observe Ramsey fringes in a $^{85}$Rb Bose-Einstein condensate. The oscillation frequency corresponded to the binding energy of the molecular state. We show that the observations are remarkably consistent with predictions of a resonance field theory in which the fringes arise from oscillations between atoms and molecules.