Transport in the two-dimensional Fermi-Hubbard model: Lessons from weak coupling

Abstract

Strongly correlated materials, where electron-electron interactions dominate, display a range of important yet poorly understood phenomena including high-temperature superconductivity and exotic magnetism. Many such materials also feature unusual ``strange-metal'' transport, corresponding to unexpected temperature dependence of the resistivity. The authors show that, due to band-structure nesting and a bounded spectrum, even a weakly interacting system can display resistivity signatures that are typically associated with such strange metals. Their results are particularly important for interpreting recent cold-atom experiments which explore transport in the Fermi Hubbard model.