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arXiv 0812.2637cond-mat.mes-hall
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分子导线中的量子输运

Quantum transport through molecular wires

Santanu K. Maiti, S. N. Karmakar

摘要:

利用格林函数方法研究了由吡咯、呋喃和噻吩等杂环分子构成的分子线的电子输运性质。基于紧束缚模型给出了描述这些线中电子输运的参数计算。结果表明,杂环分子中的杂原子和分子与电极的耦合强度对输运性质有显著影响。电导($g$)在弱分子耦合极限下表现出与分子能级相关的尖锐共振峰,而在强分子耦合极限下它们变宽。这些共振峰随着杂环分子中杂原子的变化而发生位移。通过对这些分子导线的电流-电压($I$ - $V$)特性的研究,电子通过这些分子导线的传递的所有基本特征变得更加清晰可见,并且它们在分子传递的研究中提供了几个关键信息。

英文摘要:

We explore electron transport properties in molecular wires made of heterocyclic molecules (pyrrole, furan and thiophene) by using the Green's function technique. Parametric calculations are given based on the tight-binding model to describe the electron transport in these wires. It is observed that the transport properties are significantly influenced by (a) the heteroatoms in the heterocyclic molecules and (b) the molecule-to-electrodes coupling strength. Conductance ($g$) shows sharp resonance peaks associated with the molecular energy levels in the limit of weak molecular coupling, while they get broadened in the strong molecular coupling limit. These resonances get shifted with the change of the heteroatoms in these heterocyclic molecules. All the essential features of the electron transfer through these molecular wires become much more clearly visible from the study of our current-voltage ($I$-$V$) characteristics, and they provide several key informations in the study of molecular transport.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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