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考虑实际体系的梯度无序和结散射,发展格林函数矩阵分解消元方法,研究了准一维纳米线的电子输运性质.结果表明,由于结散射,电导随能量呈现振荡行为,无序的引入破坏了电子相干性,在低无序度区平均电导呈现异常增加,呈现一个新的电导峰.当表面存在无序但无梯度衰减时,体系的平均电导随无序度增强先减后增,出现类局域—退局域性转变.当表面无序线性衰减时,平均电导在强无序区稍有增加,而当表面无序高斯型衰减时,平均电导指数衰减,类局域—退局域性转变消失,不同于以前的理论预言.研究结果对准一维纳米线电子器件的结构设计和应用有指导作用.
Considering the gradient disorder and the scattering of the actual system, the Green’s function matrix decomposition and elimination method is developed to study the electron transport properties of the quasi-one-dimensional nanowire. The results show that due to the junction scattering, The introduction of the destruction of the electronic coherence in the low degree of disorder region average conductivity showed an abnormal increase, showing a new conductance peak.When there is surface disorder but no gradient attenuation, the average conductivity of the system increases with the degree of disorder before decreasing , There is a kind of local-degenerate transition.When the surface is disorderly linearly decayed, the average conductance slightly increases in the strong disorder region, while when the surface disorderly Gaussian decay, the average conductance index decays, It is different from previous theoretical predictions that the regression of local area disappears.The research results are helpful to the structural design and application of one-dimensional nanowire electronic devices.