  Photo-doping of Mott insulators or correlated metals can create an unusual
metallic state which simultaneously hosts hole-like and electron-like
particles. We study the dynamics of this state up to long times, as it passes
its kinetic energy to the environment. When the system cools down, it crosses
over from a bad metal into a resilient quasiparticle regime, in which
quasiparticle bands are formed with separate Fermi levels for electrons and
holes, but quasiparticles do not yet satisfy the Fermi liquid paradigm.
Subsequently, the transfer of energy to the environment slows down
significantly, and the system does not reach the Fermi liquid state even on the
timescale of picoseconds. The transient photo-doped strange metal exhibits
unusual properties of relevance for ultrafast charge and heat transport: In
particular, there can be an asymmetry in the properties of electrons and holes,
and strong correlations between electrons and holes, as seen in the spectral
properties.
