Zinc blende materials

No calculations have been published for zinc-blende materials. In spite of some interesting speculation, no convincing explanation of the trends with ionity (Patterson, 1988) has been provided. 

Most surfaces of compound semiconductors are polar, that is, the number of anions and cations per surface unit cell is not balanced. While for the zinc blende materials there is only one nonpolar exception, the (110) face, for the wurtzite structures, there are two nonpolar surfaces, the m-plane (1100) and a-plane (1120) [98]. In wurtzite materials, a (110) surface does not exist because of the different crystal structure. 

In contrast, for studying materials with an isotropic bulk structure, for example, zinc blende, RAS is a very versatile optical method for surface analysis. In this case, the optical anisotropy is surface specific, regardless of the large penetration depth of the light, which usually far exceeds the surface region (a few atomic layers). Therefore, the RAS represents a quite usefiil optical method for surface investigations of zinc blende materials. 

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