论文部分内容阅读
Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Born-Huang approximation.The numerical results for sev-eral Ⅱ-Ⅵ and Ⅲ-Ⅴ compound systems are performed,and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs,GaPxAs1-x,ZnSxSe1-x,GaAsxSb1-x,GaxIn1-xP,and ZnxCd1-xS as examples are given and discussed.The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics,and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.
Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Born-Huang approximation. Numerical results for sev-eral II-VI and III-V compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAs1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.