Wenbin Yu, Eidea Labs, Inc., 1911 N. Fort Myer Dr., no. 408, Arlington, VA 22209, and D. Stroud, Department of Physics, The Ohio State University, Columbus, Ohio 43210-1106

We report the results of a molecular-dynamics study of the surface tension and surface profile of liquid Si and Ge and their alloys, using empirical Stillinger-Weber potentials. The calculations are carried out at two temperatures slightly above the melting temperatures of Si and Ge, for the pure elements and for the alloys Si_0.8 Ge_0.2 and Si_0.2Ge_0.8. They show clear evidence of surface segregation by Ge, the component with the lower surface tension.

PACS Nos.: 61.20.Ja, 61.20.Gy, 61.25.Mv, 68.10.Cr