Abstract
We have calculated the transverse effective charge of A N B 8- N compounds by taking account of the electronic polarization of valence electrons induced by the ionic displacements. It is shown that the transverse effective charge can be expressed as a function of the Phillips ionicity f i from the relation between the most important pseudopotential and band gaps on the Jones-zone faces for zincblende and rock-salt structures. We have found a critical ionicity F c that the ionicity dependent transverse effective charge Z T ( f i ) of both structures coincide with together. From the comparison with simple ionic model, the F c is assigned as identical to the Phillips critical ionicity. We have found that when taking account of the effective valence number based on the modified f -sum rule the Z T ( f i ) well agree with the experimental results for tetrahedrally coordinated compounds. For rock-salt compounds, the two set model of most strongest pseudopotential is qualitatively discussed.
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