中国物理B ›› 2005, Vol. 14 ›› Issue (5): 1011-1014.doi: 10.1088/1009-1963/14/5/027
王利光1, KatsunoriTagami2, MasaruTsukada2, 李勇3, 郁鼎文3
Wang Li-Guang (王利光)a, Li Yong (李勇)b, Yu Ding-Wen (郁鼎文)b, Tagami Katsunoric, Tsukada Masaruc
摘要: 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 π 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.
中图分类号: