  The penetration of a supersonic particle at the interface was studied in a
binary complex plasma. Inspired by the experiments performed in the PK-3 Plus
Laboratory on board the International Space Station, Langevin dynamics
simulations were carried out. The evolution of Mach cone at the interface was
observed, where a kink of the lateral wake front was observed at the interface.
By comparing the evolution of axial and radial velocity, we show that the
interface solitary wave is non-linear. The dependence of the background
particle dynamics in the vicinity of the interface on the penetration direction
reveals that the disparity of the mobility may be the cause of various
interface effects.
