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    Rights statement: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of the American Chemical Society, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/jacs.2c05909

    Accepted author manuscript, 1.83 MB, PDF document

    Embargo ends: 5/08/23

    Available under license: CC BY: Creative Commons Attribution 4.0 International License

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Quantum Interference-Controlled Conductance Enhancement in Stacked Graphene-like Dimers

Research output: Contribution to Journal/MagazineJournal articlepeer-review

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  • Peihui Li
  • Songjun Hou
  • Bader Alharbi
  • Qingqing Wu
  • Yijian Chen
  • Li Zhou
  • Tengyang Gao
  • Ruihao Li
  • Lan Yang
  • Xinyue Chang
  • Gang Dong
  • Xunshan Liu
  • Silvio Decurtins
  • Shi-xia Liu
  • Wenjing Hong
  • Colin Lambert
  • Chuangcheng Jia
  • Xuefeng Guo
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<mark>Journal publication date</mark>31/08/2022
<mark>Journal</mark>Journal of the American Chemical Society
Issue number34
Volume144
Number of pages9
Pages (from-to) 15689–15697
Publication StatusPublished
Early online date5/08/22
<mark>Original language</mark>English

Abstract

Stacking interactions are of significant importance in the fields of chemistry, biology, and material optoelectronics because they determine the efficiency of charge transfer between molecules and their quantum states. Previous studies have proven that when two monomers are π-stacked in series to form a dimer, the electrical conductance of the dimer is significantly lower than that of the monomer. Here, we present a strong opposite case that when two anthanthrene monomers are π-stacked to form a dimer in a scanning tunneling microscopic break junction, the conductance increases by as much as 25 in comparison with a monomer, which originates from a room-temperature quantum interference. Remarkably, both theory and experiment consistently reveal that this effect can be reversed by changing the connectivity of external electrodes to the monomer core. These results demonstrate that synthetic control of connectivity to molecular cores can be combined with stacking interactions between their π systems to modify and optimize charge transfer between molecules, opening up a wide variety of potential applications ranging from organic optoelectronics and photovoltaics to nanoelectronics and single-molecule electronics.

Bibliographic note

This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of the American Chemical Society, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/jacs.2c05909