Giant Conductance Enhancement of Intramolecular Circuits through Interchannel Gating

Hongliang Chen, Haining Zheng, Chen Hu, Kang Cai, Yang Jiao, Long Zhang, Feng Jiang, Indranil Roy, Yunyan Qiu, Dengke Shen, Yuanning Feng, Fehaid M. Alsubaie, Hong Guo*, Wenjing Hong, J. Fraser Stoddart

*Corresponding author for this work

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

For neutral intramolecular circuits with two constitutionally identical branches, a maximum 4-fold increase in total conductance can be obtained according to constructive quantum interference (CQI). For charged intramolecular circuits, however, the strong electrostatic interactions entangle the quantum states of these two parallel pathways, thus introducing complicated transport behavior that warrants experimental investigation of the intramolecular circuit rules. Here, we report that a tetracationic cyclophane with parallel channels exhibits a 50-fold conductance enhancement compared with that of a single-channel control, an observation that supplements intramolecular circuit law in systems with strong Coulombic interactions. Flicker noise measurements and theoretical calculations show that strong electrostatic interactions between charged parallel channels—serving as the chemical gate to promote the effective conductance of each channel—and CQI boosts the total conductance of the two-channel circuit. The molecular design presented herein constitutes a proof-of-principle approach to charged intramolecular circuits that are desirable for quantum circuits and devices.

Original languageEnglish (US)
Pages (from-to)378-389
Number of pages12
JournalMatter
Volume2
Issue number2
DOIs
StatePublished - Feb 5 2020

Keywords

  • MAP2: Benchmark
  • STM-BJ
  • chemical gating effect
  • cyclophane
  • intramolecular circuit
  • molecular electronics
  • quantum interference
  • single-molecule electronics
  • supramolecular chemistry

ASJC Scopus subject areas

  • Materials Science(all)

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  • Cite this

    Chen, H., Zheng, H., Hu, C., Cai, K., Jiao, Y., Zhang, L., Jiang, F., Roy, I., Qiu, Y., Shen, D., Feng, Y., Alsubaie, F. M., Guo, H., Hong, W., & Stoddart, J. F. (2020). Giant Conductance Enhancement of Intramolecular Circuits through Interchannel Gating. Matter, 2(2), 378-389. https://doi.org/10.1016/j.matt.2019.12.015