中文摘要：

基于散射矩阵理论和费米-托马斯近似,通过对含单势垒的量子隧穿结构的研究,得到了稳恒输运中介观结构的电导特性.结果表明,稳恒条件下接触效应对介观体系中的电子透射以及内部特征势有明显的影响;电势降所呈现的电导特性与经典电路中的基尔霍夫定律相违背,整个介观体系的电阻不能简单地视为接触电阻和散射电阻串联,必须考虑接点和介观器件间的量子相干性.因此,接点效应对于进一步研究介观体系中的电子输运起到非常重要的作用

英文摘要：

In frame of the scattering-matrix theory and Fermi-Thomas approximation,we had investigated the conductance properties of mesoscopic structure in dc case by employing a quantum tunneling structure with single barrier.Results clearly indicate that,the contact effect has notable affection on the transmission probability of electrons and the distribution of internal potential in mesoscopic system;even though dc case,the behaviors of conductance displayed in potential drop conflict with the Kirchhoff＇s laws in classical circuit,and the total resistance of the mesoscopic system cannot be expressed as contact resistance in series with ＇scatterer＇ resistance.So the quantum coherence between contacts and devices is worth considering,the role of contacts effect is important for further investigation of the electron transport in mesoscopic system.