Incoherent transport in a model for the strange metal phase: Memory-matrix formalism

We revisit a phenomenological model of fermions coupled to fluctuating bosons that emerges from finite-momentum particle-particle pairs for describing the strange metal phase in cuprates. The incoherent dominate transport properties resistivity and optical conductivity non-Fermi liquid phase. Within Kubo formalism, is approximately linear temperature with Drude form conductivity, such lifetime inversely proportional temperature. Additionally, when emerge electron spin-triplet symmetry, magnetoresistance has magnetic field dependence. Here, we compute within memory-matrix approach successfully captures hydrodynamic regime. This technique as appropriate framework coefficients Our analysis confirms $T$-linear due Umklapp scattering obtained this effective model. Finally, provide new predictions regarding variation thermal examine validity Wiedemann-Franz law.