# Magnetic Feshbach resonances in ultracold collisions between Cs and Yb atoms

## TL;DR

This study predicts and analyzes magnetically tunable Feshbach resonances in ultracold Cs-Yb collisions, highlighting their complexity and potential for forming ultracold molecules, based on coupled-channel calculations and recent spectroscopic data.

## Contribution

It provides detailed predictions of resonance positions and widths for all Yb isotopes, including effects of hyperfine interactions, advancing understanding of ultracold Cs-Yb collisions.

## Key findings

- Resonance patterns are more complex for fermionic Yb isotopes.
- Identified promising resonances for experimental observation.
- Resonance characteristics vary with Yb isotope and hyperfine states.

## Abstract

We investigate magnetically tunable Feshbach resonances in ultracold collisions between ground-state Yb and Cs atoms, using coupled-channel calculations based on an interaction potential recently determined from photoassociation spectroscopy. We predict resonance positions and widths for all stable isotopes of Yb, together with resonance decay parameters where appropriate. The resonance patterns are richer and more complicated for fermionic Yb than for spin-zero isotopes, because there are additional level splittings and couplings due to scalar and tensorial Yb hyperfine interactions. We examine collisions involving Cs atoms in a variety of hyperfine states, and identify resonances that appear most promising for experimental observation and for magnetoassociation to form ultracold CsYb molecules.