Melting and nonmelting behavior of the Au(111) surface

Abstract
A molecular-dynamics study of the melting behavior of Au(111) (both reconstructed and unreconstructed) has been carried out using a recently developed many-body force scheme. The reconstructed (denser) surface remains stable up to the bulk melting temperature TM, showing no form of microscopic surface melting. By contrast, the two outermost layers of the unreconstructed surface "melt" ∼100 K below TM. However, no more layers melt as TM is approached. The nonmelting of Au(111) is contrasted with the gradual melting behavior of Lennard-Jones surfaces.