Feshbach resonances in 3He*-4He* mixtures

TL;DR

This paper predicts Feshbach resonances in metastable helium mixtures using ab-initio calculations, identifying a broad resonance that enables tuning of inter-isotope interactions.

Contribution

It introduces a parameter-free prediction of Feshbach resonances in 3He*-4He* mixtures using the ABM and ab-initio potentials, highlighting a broad resonance for interaction control.

Findings

Identification of a broad Feshbach resonance (=72.9^{+18.3}_{-19.3} mT)

Predictions made without fitting parameters using ab-initio data

Potential for tuning inter-isotope scattering length

Abstract

We discuss the stability of homonuclear and heteronuclear mixtures of 3He and 4He atoms in the metastable 2^3S_1 state (He*) and predict positions and widths of Feshbach resonances by using the Asymptotic Bound-state Model (ABM). All calculations are performed without fit parameters, using \emph{ab-initio} calculations of molecular potentials. One promising very broad Feshbach resonance (\Delta B=72.9^{+18.3}_{-19.3} mT) is found that allows for tuning of the inter-isotope scattering length.