Two $T$-linear scattering-rate regimes in the triangular lattice Hubbard model

Abstract

In recent years, the TT-linear scattering rate found at low temperatures, defining the strange metal phase of cuprates, has been a subject of interest. Since a wide range of materials have a scattering rate that obeys the equation $ / ≈ k_B T$, the idea of a universal Planckian limit on the scattering rate has been proposed. However, there is no consensus on proposed theories yet. In this work, we present our results for the TT-linear scattering rate in the triangular lattice Hubbard model obtained using the dynamical cluster approximation. We find two regions with TT-linear scattering rate in the TT-pp phase diagram: one emerges from the pseudogap to correlated Fermi liquid phase transition at low doping, whereas the other is solely caused by large interaction strength at large doping.