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arXiv 1102.4190cond-mat.mes-hall
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单分子结中的量子干涉和退相干:振动如何引起电流

Quantum Interference and Decoherence in Single-Molecule Junctions: How Vibrations Induce Electrical Current

R. Härtle, M. Butzin, O. Rubio-Pons, M. Thoss

摘要:

采用非平衡格林函数方法分析了单分子结中的量子干涉效应和退相干机制。电子隧穿纳米分子结准简并态时表现出干涉效应。我们发现,电子振动耦合,固有的任何分子结,强烈淬灭这种干扰效应。因此,电流可以显著大于没有电子振动耦合的情况。分析表明,如果结振动高度激发,例如由于共振输运机制中的电流诱导非平衡效应,则量子干涉的猝灭特别明显。

英文摘要:

Quantum interference effects and decoherence mechanisms in single-molecule junctions are analyzed employing a nonequilibrium Green's function approach. Electrons tunneling through quasi-degenerate states of a nanoscale molecular junction exhibit interference effects. We show that electronic-vibrational coupling, inherent to any molecular junction, strongly quenches such interference effects. As a result, the electrical current can be significantly larger than without electronic-vibrational coupling. The analysis reveals that the quenching of quantum interference is particularly pronounced if the junction is vibrationally highly excited, e.g. due to current-induced nonequilibrium effects in the resonant transport regime.

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