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Quantum Interference Effects in Charge Transport through Single-Molecule Junctions: Detection, Manipulation, and

Junyang Liu1, Xiaoyan Huang1, Fei Wang1

  • 1State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM, NEL, Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering , Xiamen University , Xiamen 361005 , China.

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|December 1, 2018
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Summary
This summary is machine-generated.

Quantum interference effects (QIEs) enable precise control over charge transport in single-molecule electronics. Researchers have experimentally detected and manipulated QIEs, paving the way for advanced molecular devices.

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Area of Science:

  • Single-molecule electronics
  • Quantum interference effects
  • Nanoscale charge transport

Background:

  • Quantum interference effects (QIEs) offer unique opportunities for fine-tuning charge transport through molecular building blocks.
  • Experimental detection of QIEs, particularly destructive interference, has advanced significantly since 2011.
  • QIEs allow control over charge transport states, ranging from conductive to insulative, via minor structural and environmental changes.

Purpose of the Study:

  • To discuss progress in the experimental detection, manipulation, and application of QIEs in single-molecule junctions.
  • To explore the fundamental understanding of structure-electronic relationships in molecular devices at the nanoscale.
  • To highlight the potential of QIEs in future functional single-molecule devices.

Main Methods:

  • Utilizing mechanically controllable break junction (MCBJ) and scanning tunneling microscope break junction (STM-BJ) techniques for ultralow conductance detection.
  • Systematic investigation of charge transport through various conjugated molecular systems, including PAHs and heteroaromatics.
  • Employing external chemical and electrochemical gating for direct QIE manipulation.

Main Results:

  • Experimental detection of ultralow charge transport through cross-conjugated anthraquinone centers.
  • Quantitative correlation established between molecular structure and quantum interference in PAHs and heteroatom systems.
  • Demonstration of QIEs for detecting photothermal reaction kinetics and recognizing isomers at the single-molecule scale.

Conclusions:

  • QIEs are universally applicable in charge transport through diverse molecular building blocks.
  • Effective manipulation of QIEs leads to novel phenomena and promising applications in molecular electronics.
  • QIEs provide a powerful platform for developing next-generation functional single-molecule devices.