三元氮化物纤锌矿结构混晶In_xGa_(1-x)N中的光学声子

Optical Phonon in Wurtzite In_xGa_(1-x)N Ternary Nitride-based Crystal

采用修正的无轨离子位移模型研究三元氮化物纤锌矿混晶中的光学声子模.用微扰法对系统的弗留里希耦合常数、混晶的介电常数和谐振子强度进行计算和讨论.结果表明,纤锌矿结构InxGa1-xN中的光学声子能量等物理量随组份x出现明显非线性变化,In与Ga原子之间的相互作用对混晶的性质有显著的影响.

Optical phonons of the lattice in wurtzitc ternary nitride-based crystals Inx Ga1-x N are studied by using the modified random-element isodisplacement model. The Frhlich coupling constants, energy shifts of polaron, the dielectric constants and the oscillator strengths in the system are calculated and discussed by the perturbation method. It is found that the optical phonons, etc. vary distinct nonlinearly with the composition x of ternary nitride-based crystals InxGa1-x N. Property of mixed crystal is influenced especially by the bond of In and Ga.