Abstract
The surface states of an ideal (100) plane of a sphalerite-type crystal were studied in the one-electron approximation; both the plane formed by electronegative atoms (δ>0) and that consisting of electropositive atoms (δ<0) were investigated. The interpretation of surface states whose energy lies in the gap is the same as for the diamond-like lattice. The influence of electro-negativity or electropositivity of the surface on the position of these states in the gap was investigated and possible consequences of these states joining one of the energy bands of volume states were pointed out. The results of this paper can be used to discuss correlation effects on the (100) plane of a diamond-like crystal.
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