  We present a new model of electron transport in warm and hot dense plasmas
which combines the quantum Landau-Fokker-Planck equation with the concept of
mean-force scattering. We obtain electrical and thermal conductivities across
several orders of magnitude in temperature, from warm dense matter conditions
to hot, nondegenerate plasma conditions, including the challenging crossover
regime between the two. The small-angle approximation characteristic of
Fokker-Planck collision theories is mitigated to good effect by the
construction of accurate effective Coulomb logarithms based on mean-force
scattering, which allows the theory to remain accurate even at low
temperatures, as compared with high-fidelity quantum simulation results.
Electron-electron collisions are treated on equal footing as electron-ion
collisions. Their accurate treatment is found to be essential for hydrogen, and
is expected to be important to other low-Z elements. We find that
electron-electron scattering remains influential to the value of the thermal
conductivity down to temperatures somewhat below the Fermi energy. The accuracy
of the theory seems to falter only for the behavior of the thermal conductivity
at very low temperatures due to a subtle interplay between the Pauli exclusion
principle and the small-angle approximation as they pertain to
electron-electron scattering. Even there, the model is in fair agreement with
ab initio simulations.
