利用晶体的对称性讨论三维晶格振动

A DISCUSSION OF THREE-DIMENSIONAL LATTICE VIBRATION IN CRYSTAL BY ITS SYMMETRY

在晶格动力学中，立方晶格的本征值方程的动力学矩阵Ｄ（ｋ）比较复杂，利用晶体的对称性将Ｄ（ｋ）化简．由化简后Ｄ（ｋ）的矩阵形式，能较为容易地解久期方程及确定偏振矢量．

The dynamical matrix D(k) of the eigenvalue equation for cubic lattice is usually complex.But it can be simplified and reduced to a simple form by making use of crystal symmetry.Then the corresponding secular equation can be solved more easily and the polarization vector can be determined.