  Particle-in-Cell (PIC) method is a powerful plasma simulation tool for
investigating high-intensity femtosecond laser-matter interaction. However, its
simulation capability at high-density plasmas around the Fermi temperature is
considered to be inadequate due, among others, to the necessity of implementing
atomic-scale collisions. Here, we performed a one-dimensional with
three-velocity space (1D3V) PIC simulation that features the realistic
collision frequency around the Fermi temperature and atomic-scale cell size.
The results are compared with state-of-the-art experimental results as well as
with hydrodynamic simulation. We found that the PIC simulation is capable of
simulating the nanoscale dynamics of solid-density plasmas around the Fermi
temperature up to $\sim$2~ps driven by a laser pulse at the moderate intensity
of $10^{14-15}$~$\mathrm{W/cm^{2}}$, by comparing with the state-of-the-art
experimental results. The reliability of the simulation can be further improved
in the future by implementing multi-dimensional kinetics and radiation
transport.
