Magnetically tunable Feshbach resonances in Li+Er

TL;DR

This paper predicts and analyzes tunable Feshbach resonances in ultracold Li+Er systems, highlighting their potential for quantum simulation and molecule formation due to less congested spectra and simple mass-scaling models.

Contribution

It provides the first detailed prediction of magnetic Feshbach resonances in Li+Er, including a simple model for isotope-dependent resonance shifts, facilitating experimental design.

Findings

Many tunable resonances below 1000 G predicted

Li+Er spectra are less congested and non-chaotic

Derived a simple mass-scaling model for low-field resonances

Abstract

We explore the magnetic Feshbach spectra of ultracold ground-state Li+Er systems. Our calculations predict many tunable resonances at fields below 1000 G that could be stably tuned in ultracold experiments. We show that Li+Er spectra are much less congested than those of systems involving heavier highly-magnetic atoms and exhibit non-chaotic properties. These features would facilitate identifying and addressing individual resonances. We derive a simple model for the mass-scaling shifting of low-field resonances that may simplify designing experiments with different Er bosonic isotopes. Our work establishes Li+Er as very promising systems for quantum simulation, precision measurements and the formation of polar paramagnetic molecules.