Tunable Field-Linked $s$-wave Interactions in Dipolar Fermi Mixtures
Abstract
Spin mixtures of degenerate fermions are a cornerstone of quantum many-body physics, enabling superfluidity, polarons, and rich spin dynamics through -wave scattering resonances. Combining them with strong, long-range dipolar interactions provides highly flexible control schemes promising even more exotic quantum phases. Recently, microwave shielding gave access to spin-polarized degenerate samples of dipolar fermionic molecules, where tunable -wave interactions were enabled by field-linked resonances available only by compromising the shielding. Here, we study the scattering properties of a fermionic dipolar spin mixture and show that a universal -wave resonance is readily accessible without compromising the shielding. We develop a universal description of the tunable -wave interaction and weakly bound tetratomic states based on the microwave-field parameters. The -wave resonance paves the way to stable, controllable and strongly-interacting dipolar spin mixtures of deeply degenerate fermions and supports favorable conditions to reach this regime via evaporative cooling.
Keywords
Cite
@article{arxiv.2506.23318,
title = {Tunable Field-Linked $s$-wave Interactions in Dipolar Fermi Mixtures},
author = {Jing-Lun Li and Georgios M. Koutentakis and Mateja Hrast and Mikhail Lemeshko and Andreas Schindewolf and Ragheed Alhyder},
journal= {arXiv preprint arXiv:2506.23318},
year = {2026}
}