Title: Classifying destructive quantum interference in molecular junctions: Towards molecular quantum rulers Show Chinese title

Title: 分子结中破坏性量子干涉的分类：迈向分子量子尺

Abstract: Destructive quantum interference in molecular junctions might be used to build molecular quantum rulers, allowing to quantify changes in external control parameters electrically. For this reason, it is important to understand which patterns of destructive quantum interference can occur inside the electronic excitation gap of a molecule, coupled to conducting electrodes. By considering a four-level model, we show that much more complex destructive quantum interference behavior can arise than expected for just two levels. We classify the destructive quantum interferences analytically and show that they may even occur in regions forbidden by the standard orbital rule for electron transport. Our results suggest that appropriate molecular design may indeed allow to construct highly sensitive molecular quantum rulers. Show Chinese abstract

Abstract: 分子结中的破坏性量子干涉可能被用于构建分子量子尺，从而允许通过电学方法量化外部控制参数的变化。 因此，理解分子与其耦合的导电电极之间的电子激发隙内可能出现的破坏性量子干涉模式至关重要。 通过考虑四能级模型，我们证明了比仅仅两个能级预期的更为复杂的破坏性量子干涉行为可以出现。 我们对破坏性量子干涉进行了解析分类，并表明它们甚至可能出现在电子输运的标准轨道规则禁止的区域。 我们的结果表明，适当的分子设计确实可能实现高度灵敏的分子量子尺。