Non-Fermi liquid phase and linear-in-temperature scattering rate in overdoped two-dimensional Hubbard model

Understanding electronic properties that violate the Landau Fermi liquid paradigm in cuprate superconductors remains a major challenge in condensed-matter physics. The strange metal state in overdoped cuprates that exhibits linear-in-temperature scattering rate and direct current (dc) resistivity is a particularly puzzling example. Here, we compute the electronic scattering rate in the two-dimensional Hubbard model using cluster generalization of dynamical mean-field theory. We present a global phase diagram documenting an apparent non-Fermi liquid phase, in between the pseudogap and Fermi liquid phase in the doped Mott insulator regime. We discover that in this non-Fermi liquid phase, the electronic scattering rate gamma(k) (T) can display linear temperature dependence as temperature T goes to zero. In the temperature range that we can access, the T-dependent scattering rate is isotropic on the Fermi surface, in agreement with recent experiments. Using fluctuation diagnostic techniques, we identify antiferromagnetic fluctuations as the physical origin of the T-linear electronic scattering rate.

Automated summary

In this study, the electronic scattering rate in cuprate superconductors was investigated using cluster generalization of dynamical mean-field theory, revealing the presence of a non-Fermi liquid phase with linear temperature dependence of the scattering rate, originating from antiferromagnetic fluctuations.