Nonadditive Transport in Multi‐Channel Single‐Molecule Circuits

As stated in the classic Kirchhoff's circuit laws, the total conductance of two parallel channels in an electronic circuit is the sum of the individual conductance. However, in molecular circuits, the quantum interference (QI) between the individual channels may lead to apparent invalidity of K...

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Bibliographic Details
Published in:Small (Weinheim an der Bergstrasse, Germany) Germany), 2020-10, Vol.16 (39), p.e2002808-n/a
Main Authors: Chen, Li‐Chuan, Zheng, Jueting, Liu, Junyang, Gong, Xiao‐Ting, Chen, Zi‐Zhen, Guo, Rui‐Xue, Huang, Xiaoyan, Zhang, Yu‐Peng, Zhang, Lei, Li, Ruihao, Shao, Xiangfeng, Hong, Wenjing, Zhang, Hao‐Li
Format: Article
Language:English
Subjects:
Channels
charge transport
Circuits
Cognition
Electronic circuits
Interference
molecular devices
multi‐channel circuits
Nanotechnology
quantum interference
Resistance
single‐molecule circuits
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Summary:As stated in the classic Kirchhoff's circuit laws, the total conductance of two parallel channels in an electronic circuit is the sum of the individual conductance. However, in molecular circuits, the quantum interference (QI) between the individual channels may lead to apparent invalidity of Kirchhoff's laws. Such an effect can be very significant in single‐molecule circuits consisting of partially overlapped multiple transport channels. Herein, an investigation on how the molecular circuit conductance correlates to the individual channels is conducted in the presence of QI. It is found that the conductance of multi‐channel circuit consisting of both constructive and destructive QI is significantly smaller than the addition of individual ones due to the interference between channels. In contrast, the circuit consisting of destructive QI channels exhibits an additive transport. These investigations provide a new cognition of transport mechanism and manipulation of transport in multi‐channel molecular circuits. When the dimension of charge transport is reduced to the molecular scale, quantum interference (QI) effects may take place between the different channels. The overall conductance of multi‐channel single‐molecule circuits can be either equal or nonequal to the sum of the individual channels, which is dominated by the QI status between the channels.
ISSN:1613-6810
1613-6829
DOI:10.1002/smll.202002808