Two strange metal regions in the doped triangular lattice Hubbard model*

In recent years, the T-linear resistivity 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 ħ/τ = k_BT, the idea of a universal Planckian limit on the scattering rate has been proposed ¹. However, there is no consensus on proposed theories yet. In this work, we present our results for the strange metal phase in the triangular lattice Hubbard model obtained using the dynamical cluster approximation. We find two regions with T-linear scattering rate in the T-p phase diagram: one emerges from the pseudogap to correlated Fermi liquid phase transition, whereas the other is solely caused by large interaction strength.

 

[1] Bruin, J. A. N., H. Sakai, R. S. Perry, et A. P. Mackenzie. « Similarity of Scattering Rates in Metals Showing T-Linear Resistivity ». Science 339, no 6121 (15 février 2013): 804‑7. https://doi.org/10.1126/science.1227612.