Transport in the t-t'-J model in 2-d using the Extremely Correlated Fermi Liquid theory

We present the low energy transport functions of the t-t'-J model in 2-dimensions, relevant for understanding cuprate superconductors. The calculations are based on recent progress in the extremely correlated Fermi liquid theory, applicable to strong coupling models. The spectral functions, the resistivity ρ(T) and Hall conductivities can be obtained at various density, t' and J. The quasiparticle weight Z is typically very small for n ≥ 0.8. The spectral properties display a remarkable thermal sensitivity, with an effective Fermi temperature lower than the bare bandwidth by two orders of magnitude. At low T flipping the sign of t' also flips the curvature of the ρ(T) ↔ T curves, from convex to concave. These resemble the observed curvature flips in hole-doped versus electron-doped systems. At low T, the cotangent Hall angle behaves as T^2. It also displays a bending (i.e. kink) at higher T, signifying a crossover from a (Gutzwiller correlated) Fermi liquid to a strange metal.