Single-molecule electrical junctions possess a molecular core connected to source and drain electrodes via anchor groups, which feed and extract electricity from specific atoms within the core. As the distance between electrodes increases, the electrical conductance typically decreases, which is a feature shared by classical Ohmic conductors. Here we analyze the electrical conductance of cycloparaphenylene (CPP) macrocycles and demonstrate that they can exhibit a highly nonclassical increase in their electrical conductance as the distance between electrodes increases. We demonstrate that this is due to the topological nature of the de Broglie wave created by electrons injected into the macrocycle from the source. Although such topological states do not exist in isolated macrocycles, they are created when the molecule is in contact with the source. They are predicted to be a generic feature of conjugated macrocycles and open a new avenue to implementing highly nonclassical transport behavior in molecular junctions.

中文翻译：

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共轭大环拓扑态的签名

单分子电连接点拥有一个分子核心，通过锚定基团连接到源极和漏极，锚定基团从核心内的特定原子馈送和提取电力。随着电极之间距离的增加，电导通常会降低，这是经典欧姆导体所共有的特征。在这里，我们分析了环对亚苯基（CPP）大环化合物的电导率，并证明随着电极之间距离的增加，它们的电导率可以表现出高度非经典的增加。我们证明这是由于电子从源注入大环而产生的德布罗意波的拓扑性质所致。尽管这种拓扑状态并不存在于孤立的大环化合物中，但它们是在分子与源接触时产生的。预计它们将成为共轭大环化合物的通用特征，并为在分子连接中实现高度非经典的传输行为开辟一条新途径。