We provide new insight into atomic contrast obtained using Kelvin Probe Force Microscopy based on both experimental and theoretical analysis. We approved, that the atomic contrast is not an artefact, but it has a physical background. In particular, we peform a set of complex computer simulations of tip-sample interaction between a scanning probe and surface. The simulations showed a change of the charge density redistribution and consequently the surface dipole due to the formation of the chemical bond between a probe and surface atoms. The full text >>
