高等学校化学学报

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分子结的非弹性隧道谱和电子-振动的耦合

严六明1, 纪晓波1,2, 朱素华1,2, 陆文聪1   

    1. 上海大学理学院化学系,
    2. 材料科学与工程学院, 上海 200444
  • 收稿日期:2006-11-03 修回日期:1900-01-01 出版日期:2007-12-10 发布日期:2007-12-10
  • 通讯作者: 严六明

Inelastic Tunneling Spectroscopy and Electron-Vibrational Coupling of Molecular Junctions

YAN Liu-Ming1*, JI Xiao-Bo1,2, ZHU Su-Hua1,2, LU Wen-Cong1   

    1. Department of Chemistry, College of Sciences,
    2. School of Material Science and Engineering,Shanghai University, Shanghai 200444, China
  • Received:2006-11-03 Revised:1900-01-01 Online:2007-12-10 Published:2007-12-10
  • Contact: YAN Liu-Ming

摘要: 研究了分子结的非弹性隧道谱, 给出了基于微扰理论近似的非平衡格林函数. 深入研究了非弹性隧道谱和电子-振动耦合常数的相互关系. 同时, 还计算了OPV和OPE分子结的IETS, 计算结果与有关的实验结果具有很好的可比性.

关键词: 分子结, 非弹性隧道谱, 电子-振动耦合, 微扰理论, 从头计算, 格林函数

Abstract: On the basis of the nonequilibrium Green's function theory and perturbation theory, an IETS formalism is developed. In the formalism, the nonequilibrium Green's function of a molecular junction is separated into contributions from the elastic and inelastic electron tunneling, respectively. And IETS is directly related to the electron-vibrational coupling constant. The formalism provides insights into the mechanism of active vibrational modes for IETS. By applying the Gaussian 03 and DUSHIN programs to our formalism, the IETS of molecular junctions of oligo(phenylene vinylene) and oligo(phenylene ethynylene) are calculated, and good agreement between the calculation results and experimental measurements is observed.

Key words: Molecular junction, Inelastic tunneling spectroscopy, Electron-vibrational coupling, Perturbation theory, ab initio, Green’s function

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