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Nodal angle resolved photoemission spectra taken on overdopedLa$_{1.77}$Sr$_{0.23}$CuO$_4$ are presented and analyzed. It is proven that thelow-energy excitations are true Landau Fermi-liquid quasiparticles. We showthat momentum and energy distribution curves can be analyzed self-consistentlywithout quantitative knowledge of the bare band dispersion. Finally, byimposing Kramers-Kronig consistency on the self-energy $\Sigma$, insight intothe quasiparticle residue is gained. We conclude by comparing our results toquasiparticle properties extracted from thermodynamic, magneto-resistance, andhigh-field quantum oscillation experiments on overdopedTl$_2$Ba$_2$CuO$_{6+\delta}$.

Nodal Landau Fermi-Liquid Quasiparticles in Overdoped La$_{1.77}$Sr$_{0.23}$CuO$_4$