ملخص: In order to clarify the electronic and optical properties of wide-energy gap zinc-blende structure ZnSe, MgSe and their alloys, a simple pseudopotential scheme, with an affective potential the virtual crystal approximation which incorporates compositional disorder, is presented.The angular correlation of positron annihilation radiation along different crystallographic directions in Zn1-xMgxSe is calculated. We observe that the electron-positron momentum density decreases rapidly with increasing magnesium content.

لغة: إنجليزية