基于格林函数的多终端量子链状体系电子输运性质的研究  

Electron transport in multi-terminal quantum chain systems based on the Green's functions

作　　者：戴振宏[1,2] 倪军[1] 

机构地区：[1]清华大学物理系 [2]烟台大学物理系,烟台264005

出　　处：《物理学报》2005年第7期3342-3345,共4页Acta Physica Sinica

基　　金：国家重点基础发展规划项目(批准号:G2000067107)资助的课题.~~

摘　　要：利用递推格林函数技术计算了多终端量子体系的电子输运特性,首先运用递归方法给出介观或量子体系的格林函数.然后利用散射矩阵和输运方程给出体系的电导方程,可以将多终端的输运简化为双终端的输运方程,以便得到体系电子输运的谱结构.计算结果表明,由于中间节点的存在,使器件的传输谱偏离一维链的对称性,在低能量端出现一个新的电导峰值.此外,本方法可以被应用到各种复杂的带有吸附结构量子体系输运的研究中.We have introduced a method for the calculation of electron transport in a multi-terminal quantum system based on the recursive Green's function technique. The corresponding transport equation is presented by scattering matrix, which is expressed by Green's function. Using this method, the multi-terminal device can be simplified as a standard two-terminal device, which is convenient in treating the mesoscopic device. It is found that the transmission and reflection probabilities of the two multiterminal quantum systems show complex spectra. The results show that the special node can destroy the symmetrical conductance spectra, and there is a new conductance peak in the low-energy region. This method can also be applied to the study of electron transport of complex mesoscopic structures.

关 键 词：格林函数 电子输运性质 多终端 链状 电子输运特性 量子体系 输运方程 技术计算 电导方程 递归方法 计算结果 吸附结构 矩阵和 谱结构 对称性 一维链 传输谱 低能量 介观 

分 类 号：O482.4[理学—固体物理]