Conductance of three-terminal molecular bridge based on tight-binding theory
Wang Li-Guang (王利光)a, Li Yong (李勇)b, Yu Ding-Wen (郁鼎文)b, Tagami Katsunoric, Tsukada Masaruc
a College of Science, Southern Yangtze University, Wuxi 214122, China; b Department of Precision Instrument, Tsinghua University, Beijing 100084, China; c Department of Physics, Graduate School of Science, University of Tokyo, Tokyo, 113-0033, Japan
Abstract The quantum transmission characteristic of three-benzene ring nano-molecular bridge is investigated theoretically by using Green's function approach based on tight-binding theory with only a $\pi$ orbital per carbon atom at the site. The transmission probabilities that electrons transport through the molecular bridge from one terminal to the other two terminals are obtained. The electronic current distributions inside the molecular bridge are calculated and shown in graphical analogy by the current density method based on Fisher-Lee formula at the energy points E=±0.42, ±1.06 and ±1.5, respectively, where the transmission spectra appear peaks. We find that the transmission spectra are related to the incident electronic energy and the molecular levels strongly, and the current distributions agree well with Kirchhoff quantum current momentum conservation law.
Received: 18 August 2004
Revised: 07 January 2005
Accepted manuscript online:
Fund: Project supported by the State Key Development Program for Basic Research of China (Grant No. 2003CB716204), partly by the International Corporation Project from University of Tokyo (Devices on Molecular and DNA Levels)
Cite this article:
Wang Li-Guang (王利光), Li Yong (李勇), Yu Ding-Wen (郁鼎文), Tagami Katsunori, Tsukada Masaru Conductance of three-terminal molecular bridge based on tight-binding theory 2005 Chinese Physics 14 1011
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