非对角无序和维数效应对低维无序系统电子结构的影响

运用负本征值理论，探讨了非对角无序、维数效应对低维无序系统电子结构的影响，研究表 明，非对角无序和维数效应对低维无序系统电子结构的影响很大.非对角无序主要体现出系 统的结构变化和粒子边界效应；从一维单链、准一维双链到准一维三链无序系统，电子局域 化程度加大，电子能带结构更复杂，体现出显著的维数效应. 关键词： 电子结构 低维无序系统 非对角无序 维数效应

The effects of non-diagonal disorder and dimensions in low-dimensional disordered electronic system

Based on the negative eigenvalue theory we discuss the non-diagonal disorder and dimensional effects for the electronic structure in low-dimensional disordered systems. The result shows that: It is the non-diagonal disorder and the dimensio nal effect that strongly affects the electronic structure in the low-dimensional disordered system. The non-diagonal disordered mainly shows the changes of the structure and the boundary effects of the particles in the system. From one- dim ensional system to narrow gap one, the number of the electronic bandgap decrease s, the degree of local states increases, and the structure of the energy gap wil l be more complicated.