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Anti-resonance features of destructive quantum interference in single-molecule thiophene junctions achieved by electrochemical gating

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Bai, Jie, Daaoub, Abdalghani, Sangtarash, Sara, Li, Xiaohui, Tang, Yongxiang, Zou, Qi, Sadeghi, Hatef, Liu, Shuai, Huang, Xiaojuan, Tan, Zhibing, Liu, Junyang, Yang, Yang, Shi, Jia, Mészáros, Gábor, Chen, Wenbo, Lambert, Colin and Hong, Wenjing (2019) Anti-resonance features of destructive quantum interference in single-molecule thiophene junctions achieved by electrochemical gating. Nature Materials, 18 (4). pp. 364-369. doi:10.1038/s41563-018-0265-4 ISSN 1476-1122.

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Official URL: http://dx.doi.org/10.1038/s41563-018-0265-4

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Abstract

Controlling the electrical conductance and in particular the occurrence of quantum interference in single-molecule junctions through gating effects has potential for the realization of high-performance functional molecular devices. In this work we used an electrochemically gated, mechanically controllable break junction technique to tune the electronic behaviour of thiophene-based molecular junctions that show destructive quantum interference features. By varying the voltage applied to the electrochemical gate at room temperature, we reached a conductance minimum that provides direct evidence of charge transport controlled by an anti-resonance arising from destructive quantum interference. Our molecular system enables conductance tuning close to two orders of magnitude within the non-faradaic potential region, which is significantly higher than that achieved with molecules not showing destructive quantum interference. Our experimental results, interpreted using quantum transport theory, demonstrate that electrochemical gating is a promising strategy for obtaining improved in situ control over the electrical performance of interference-based molecular devices.

Item Type: Journal Article
Divisions: Faculty of Science, Engineering and Medicine > Engineering > Engineering
Journal or Publication Title: Nature Materials
Publisher: Nature Publishing Group
ISSN: 1476-1122
Official Date: April 2019
Dates:
DateEvent
April 2019Published
11 February 2019Available
3 December 2018Accepted
Volume: 18
Number: 4
Page Range: pp. 364-369
DOI: 10.1038/s41563-018-0265-4
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
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