含单势垒量子隧穿结构电子稳恒输运中的接点效应

华东师范大学学报(自然科学版) ›› 2013, Vol. 2013 ›› Issue (3): 186-193.

含单势垒量子隧穿结构电子稳恒输运中的接点效应

田英¹，全军²

1. 湛江师范学院~~博雅教育中心, 广东~~湛江 524048; 2. 湛江师范学院~~物理科学与技术学院, 广东~~湛江 524048

收稿日期:2012-05-01 修回日期:2012-08-01 出版日期:2013-05-25 发布日期:2013-07-10

Contact effect of quantum tunneling structure with single barrier in dc electron transport

TIAN Ying¹, QUAN Jun²

1. Center of liberal education, Zhanjiang Normal University, Zhanjiang Guangdong 524048, China; 2. School of Physics Science and Technology, Zhanjiang Normal University, Zhanjiang Guangdong 524048, China

Received:2012-05-01 Revised:2012-08-01 Online:2013-05-25 Published:2013-07-10

摘要/Abstract

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

关键词: 电子输运, 介观体系, 散射矩阵理论, 费米-托马斯近似

Abstract: 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.

Key words: electron transport, mesoscopic system, scattering-matrix theory, Fermi-Thomas approximation

中图分类号:

0469

田英，全军. 含单势垒量子隧穿结构电子稳恒输运中的接点效应[J]. 华东师范大学学报(自然科学版), 2013, 2013(3): 186-193.

TIAN Ying, QUAN Jun. Contact effect of quantum tunneling structure with single barrier in dc electron transport[J]. Journal of East China Normal University(Natural Sc, 2013, 2013(3): 186-193.

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