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arXiv · 2208.08788

Fano Interference in a Single-Molecule Junction

Yiping Ouyang·Rui Wang·Deping Guo·Yang-Yang Ju·Danfeng Pan·Xuecou Tu·Lin Kang·Jian Chen·Peiheng Wu·Xuefeng Wang·Jianguo Wan·Minhao Zhang·Wei Ji·Yuan-Zhi Tan·Su-Yuan Xie·Fengqi Song
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Abstract

Trends of miniaturized devices and quantum interference electronics lead to the long desire of Fano interference in single-molecule junctions, here, which is successfully demonstrated using the 2,7-di(4-pyridyl)-9,9'-spirobifluorene molecule with a long backbone group and a short side group. Experimentally, the two electrically coupled groups are found to contribute to two blurred degenerate points in the differential conductance mapping. This forms a characteristic non-centrosymmetric double-crossing feature, with distinct temperature response for each crossing. Theoretically, we describe the practical in-junction electron transmission using a new two-tunnelling-channel coupling model and obtain a working formula with a Fano term and a Breit-Wigner term. The formula is shown to provide a good fit for all the mapping data and their temperature dependence in three dimensions, identifying the Fano component. Our work thus forms a complete set of evidence of the Fano interference in a single-molecule junction induced by two-tunnelling-channel coupling transport. Density functional theory calculations are used to corroborate this new physics.

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Yiping Ouyang, Rui Wang, Deping Guo, Yang-Yang Ju, Danfeng Pan, Xuecou Tu, Lin Kang, Jian Chen, Peiheng Wu, Xuefeng Wang, Jianguo Wan, Minhao Zhang, Wei Ji, Yuan-Zhi Tan, Su-Yuan Xie, Fengqi Song. 2022-08-18. Fano Interference in a Single-Molecule Junction. https://arxiv.org/abs/2208.08788

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