  Recent experimental papers on hole-doped overdoped cuprates have argued that
a series of observations showing unexpected behavior in the superconducting
state imply the breakdown of the quasiparticle-based Landau-BCS paradigm in
that doping range. In contrast, some of the present authors have argued that a
phenomenological "dirty $d$-wave" theoretical analysis explains essentially all
aspects of thermodynamic and transport properties in the superconducting state,
provided the unusual effects of weak, out-of-plane dopant impurities are
properly accounted for. Here we attempt to place this theory on a more
quantitative basis by performing $\textit{ab-initio}$ calculations of dopant
impurity potentials for LSCO and Tl-2201. These potentials are more complex
than the pointlike impurity models considered previously, and require
calculation of forward scattering corrections to transport properties.
Including realistic, ARPES-derived bandstructures, Fermi liquid
renormalizations, and vertex corrections, we show that the theory can explain
semiquantitatively the unusual superfluid density measurements of the two most
studied overdoped materials.
