Strange metallicity in the doped Hubbard model

• Published in: Science (American Association for the Advancement of Science) Vol. 366; no. 6468; pp. 987 - 990
• Main Authors: Huang, Edwin W., Sheppard, Ryan, Moritz, Brian, Devereaux, Thomas P.
• Format: Journal Article
• Language: English
• Published: United States American Association for the Advancement of Science 22.11.2019; The American Association for the Advancement of Science; AAAS
• Subjects: Charge materials; Climate; Computer simulation; Confidence; Correlation; Current carriers; Doping; High temperature; High temperature superconductors; Incompatibility; MATERIALS SCIENCE; Mathematical models; Metallicity; Metals; Monte Carlo simulation; Temperature; Temperature dependence; Transport properties; Two dimensional models
• ISSN: 0036-8075; 1095-9203; 1095-9203
• DOI: 10.1126/science.aau7063

Strange or bad metallic transport, defined by incompatibility with the conventional quasiparticle picture, is a theme common to many strongly correlated materials, including 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 of the noninteracting 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.