各向异性固体光谱中的鞍点性质  

The Properties of Saddle Points in Optical Spectra of Anisotropic Solids

作　　者：余招贤[1] 莫党[1] 

机构地区：[1]中山大学物理学系

出　　处：《中山大学学报（自然科学版）》1994年第3期30-35,共6页Acta Scientiarum Naturalium Universitatis Sunyatseni

摘　　要：在分数维空间模型下，研究三维（３Ｄ）各向异性固体带间光谱的鞍点特性，得到了鞍点邻近区域电子能态密度和介电函数的解析表达式，并说明只能对其中一种类型鞍点的光谱结构作适当阶数的分数微分处理后可以得到对称的洛伦兹线型．The optical properties associated with electron interband allowed directtransitions near saddle points in 3D anisotropic systems are studied by using thefractional-dimensional space model.Density of states and the dielectric function insaddle point regions are obtained analytically.The result shows that a symmetricLorentzian line shape can be obtained only for one of two types of saddle points after-fractional differentiation.

关 键 词：鞍点 能态密度 各向异性固体 光谱 

分 类 号：O481[理学—固体物理]