Unbiased numerical transport study of three-band Hubbard model

The transport behavior is a fundamental theme to quantum materials, including both conventional metals well described by Fermi liquid theory, and strange metals such as high-Tc superconductors. Among enormous approaches to this problem, the single-band Hubbard model has been wildly used in exploring this. However, a clear quantitative picture of how explicitly including the oxygen ions would change transport behavior remains elusive. Here we show, by using determinant quantum Monte Carlo (DQMC) simulations of the three-band Hubbard model, that while single band has a strikingly linear T behavior, the three-band model shows a low temperature curvature indicating a crossover to a lower resistive state. Consistent evidence has also been found in thermodynamic and superconducting measurements, which further implies possible connection between superconducting and transport behaviors.