Lattice Unitarity: Saturated Collisional Resistivity in Hubbard Metals
Abstract
We investigate the interaction-induced resistivity of ultracold fermions in a three-dimensional optical lattice. In situ observations of transport dynamics enable the determination of real and imaginary resistivity. In the strongly interacting metallic regime, we observe a striking saturation of the current-dissipation rate towards a value that is independent of the interaction strength. This phenomenon is quantitatively captured by a dissipation model that uses a renormalized two-body scattering matrix. We further measure the temperature dependence of resistivity in the strongly interacting limit and discuss the predicted asymptotic high-temperature behavior. Our results provide a clear microscopic understanding of bounded resistivity of low-density metals, thus providing a useful benchmark for studies of strongly correlated atomic and electronic systems.
Keywords
Cite
@article{arxiv.2510.19395,
title = {Lattice Unitarity: Saturated Collisional Resistivity in Hubbard Metals},
author = {Frank Corapi and Robyn T. Learn and Benjamin Driesen and Antoine Lefebvre and Xavier Leyronas and Frédéric Chevy and Cora J. Fujiwara and Joseph H. Thywissen},
journal= {arXiv preprint arXiv:2510.19395},
year = {2026}
}