The mechanisms of molecular beam epitaxy were investigated by growing and analyzing the shapes of facet structures which consisted of an (001) top surface and two (111)B side surfaces. The diffusion of Al was found to be almost negligible; regardless of the As flux. By analyzing the shape of the facet, the diffusion length of Al was estimated to be about 0.02.

S.Koshiba, Y.Nakamura, M.Tsuchiya, H.Noge, H.Kano, Y.Nagamune, T.Noda, H.Sakaki: Journal of Applied Physics, 1994, 76[7], 4138-44