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分子线伏-安特性第一性原理 被引量:8

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摘要 发展了一套理论方法用于描述分子线的伏-安特性.在该弹性散射Green 函数方法中,分子的电子结构和分子与金表面的相互作用能常数决定了分子线的伏-安曲线.从第一性原理出发利用密度泛函理论计算了4,4’-二巯基联苯分子的电子结构,并利用了前线轨道理论和微扰理论定量地确定了该相互作用能常数.研究结果表明当含有硫氢官能团的有机分子化学吸附于金表面时,硫原子将与金原子形成以共价键为主的混合键,此时扩展的分子轨道使分子线的电导呈现出欧姆特性.而对于局域的分子轨道,此时电子的输运只能通过隧道效应来实现.对分子线伏-安特性的计算结果显示,在零偏压附近,存在一个电流禁区.随着偏压的增加,分子线的电导呈现出平台特征.该工作将有利于未来的纳米电子学器件的设计.
出处 《中国科学(A辑)》 CSCD 北大核心 2002年第8期704-710,共7页 Science in China(Series A)
基金 山东省自然科学基金(批准号:Y2000A03) 山东省优秀中青年科学家奖励基金(批准号:1998) 教育部骨干教师资助计划基金资助项目
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参考文献18

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共引文献19

同被引文献80

  • 1高芒来,孔祥兴,张希,沈家骢.功能性超薄有序分子沉积膜的制备及其结构研究[J].高等学校化学学报,1993,14(8):1182-1183. 被引量:27
  • 2曹泽星,梁国明,田安民,鄢国森,唐敖庆,李前树.线性碳元素簇合物的成键性质[J].物理化学学报,1993,9(6):770-775. 被引量:3
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