Toshiharu Irisawa

The Monte Carlo study of the surface structure under MBE growth conditions is carried out. Characteristic surface diffusion field is obtained with respect to each growth mode. Two-dimensional nucleation on the terrace is investigated in atomic level using the time evolution of the density of clusters. Concerning the anisotropy of surface structure, the main reason for this is not the surface diffusion anisotropy but the anisotropic bond energy. The stoichiometric A-B crystal with the layer-by-layer mode is obtained in a range phi(AA) = phi(BB) = phi(AB)/r, r greater than or equal to 1, J(A) = J(B), where phi(AA), phi(BB), and phi(AB) are the bond energies of A-A, B-B and A-B bonds, J(A) and J(B) are the flux of A and B atoms, respectively. It is found that the orderliness S of A-B crystal is a function of (2 phi(AB)/kT - Delta mu/kT), where Delta mu/kT is the parameter representing the intensity of the flux.