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Al-C60-Al分子结电子输运特性的第一性原理计算
First-principles Calculation of the Conductance of the Al-C60-Al Junction
【摘要】 利用基于密度泛函理论的格林函数方法,计算了Al-C60-Al分子结的电子输运特性.考虑了C60分子在铝电极表面的原子结构弛豫,计算结果表明共振传导是Al-C60-Al分子结电子输运的主要特征,在费米能级附近的电导约为1.14G0(G0=2e2/h).投影态密度(PDOS)分析表明,Al-C60-Al分子结的电子输运主要通过C60分子的最低空分子轨道(LUMO)和次低空分子轨道(LUMO+1)进行.讨论了C60分子和铝电极之间距离的变化对其电子输运特性的影响.
【Abstract】 The conductance of an Al-C60-Al molecule junction is calculated using a density functional theory combined with Green′s function method. When the molecule is connected to the electrodes and allowed to relax, resonant conductance is the main feature of the transport properties of the Al-C60-Al molecule junction. The conductance around the Fermi level is determined to be about 1.14G0 (G0=2e2/h). Analysis of the density of states projected onto the frontier molecular orbitals of the C60 molecule shows that electron transport occurs primarily through the lowest unoccupied molecular orbital (LUMO) and the second lowest unoccupied molecular orbital (LUMO+1) of C60. The dependence of the junction conductance on the distance between the C60 molecule and the electrodes is also discussed.
【Key words】 Al-C60-Al molecule junction; Electron transport; Density functional theory; Green′s function method;
- 【文献出处】 物理化学学报 ,Acta Physico-Chimica Sinica , 编辑部邮箱 ,2006年02期
- 【分类号】O641.1
- 【被引频次】7
- 【下载频次】267