Fano Interference in a Single-Molecule Junction
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.
Cite
@article{arxiv.2208.08788,
title = {Fano Interference in a Single-Molecule Junction},
author = {Yiping Ouyang and Rui Wang and Deping Guo and Yang-Yang Ju and Danfeng Pan and Xuecou Tu and Lin Kang and Jian Chen and Peiheng Wu and Xuefeng Wang and Jianguo Wan and Minhao Zhang and Wei Ji and Yuan-Zhi Tan and Su-Yuan Xie and Fengqi Song},
journal= {arXiv preprint arXiv:2208.08788},
year = {2022}
}
Comments
13 pages (main text), 4000 Words (main text), 5 figures