近、远端c60分子桥的量子传输和电流分布

L. Wang, D.W. Yu, Y. Li, K. Wong
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引用次数: 0

摘要

采用基于紧密结合理论的格林函数方法,从理论上研究了具有近端和远端电极的c60分子桥的量子传输特性,其中c60分子中每个碳原子只考虑一个π轨道。得到了电子通过c60分子桥从一个输入端到两个输出端的透射谱。利用基于Fisher-Lee公式的电流密度法计算分子桥内部的量子电流分布,分别在能量点E=-1.36eV和+1.59eV处,传输概率出现峰值。我们发现透射光谱与入射电子能量有关,并且强烈依赖于c60分子水平。我们还发现c60分子桥的多点开关特性取决于通过c60分子传输的电子的能量。说明了c60分子桥中的量子电流分布符合基尔霍夫量子电流动量守恒定律。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Quantum Transmission and Current Distribution of C60Molecule Bridge with Near-, Far-terminal Electrodes
The quantum transmission characteristic of a C60molecular bridge with near- and far-terminal electrodes is investigated theoretically by using Green's function approach based on tight-binding theory, in which only one π orbital is considered per carbon atom inside a C60molecule. The transmission spectra for electrons through the C60molecular bridge from an input terminal to two output terminals have been obtained. The quantum current distributions inside the molecular bridge are calculated by the current density method based on the Fisher-Lee formula at the energy points E=-1.36eV and +1.59eV, respectively, where the transmission probabilities appear as peaks. We found that the transmission spectra are related to the incident electronic energy and depend on C60molecular levels strongly. We also found that the multi-point switching properties of C60molecular bridge depend on the energy of the electrons transmitted through the C60molecule. Agreement of the quantum current distributions in the C60molecular bridge with Kirchhoff quantum current momentum conservation law is explained.
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