Strange metallicity in the doped Hubbard model

TL;DR

This paper demonstrates strange metallic transport in the doped 2D Hubbard model using quantum Monte Carlo, showing resistivities exceeding the Mott-Ioffe-Regel limit with linear temperature dependence, relevant to high-temperature superconductors.

Contribution

First demonstration of strange metallic behavior in the doped Hubbard model using determinantal quantum Monte Carlo methods.

Findings

Resistivities exceed the Mott-Ioffe-Regel limit.

Resistivity shows linear temperature dependence.

Findings extend to low temperatures relevant to experiments.

Abstract

Strange or bad metallic transport, defined by its incompatibility with conventional quasiparticle pictures, is a theme common to strongly correlated materials and ubiquitous in many high temperature superconductors. The Hubbard model represents a minimal starting point for modeling strongly correlated systems. Here we demonstrate strange metallic transport in the doped two-dimensional Hubbard model using determinantal quantum Monte Carlo calculations. Over a wide range of doping, we observe resistivities exceeding the Mott-Ioffe-Regel limit with linear temperature dependence. The temperatures of our calculations extend to as low as 1/40 the non-interacting bandwidth, placing our findings in the degenerate regime relevant to experimental observations of strange metallicity. Our results provide a foundation for connecting theories of strange metals to models of strongly correlated materials.