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Large Conductance Variations in a Mechanosensitive Single-Molecule Junction.

Davide Stefani1, Kevin J Weiland2, Maxim Skripnik3,4

  • 1Kavli Institute of Nanoscience , Delft University of Technology , 2600 GA Delft , The Netherlands.

Nano Letters
|August 23, 2018
PubMed
Summary
This summary is machine-generated.

We demonstrate mechanical control over a molecule's electrical conductance, achieving a tenfold change by stretching or compressing it. This breakthrough in molecular electronics utilizes quantum interference for room-temperature sensing applications.

Keywords:
Quantum interferencedensity functional theorymechanically controlled break-junctionsmolecular electronicsnanoscale transportsingle-molecule

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Area of Science:

  • Molecular electronics
  • Quantum chemistry
  • Nanoscale devices

Background:

  • Molecular electronics offers potential for single-molecule sensing and switching.
  • Controlling orbital structure with external stimuli is key to device functionality.
  • Sizable conductance changes are necessary for practical applications.

Purpose of the Study:

  • To investigate the mechanical control of a molecule's electrical conductance.
  • To explore the role of quantum interference in conductance variations.
  • To assess the potential for room-temperature molecular sensing devices.

Main Methods:

  • Utilizing a spring-like molecule for mechanical manipulation.
  • Employing quantum-chemistry calculations to understand electronic structure changes.
  • Measuring conductance variations under compressive and tensile strain.
  • Modulating electrode separation to observe conductance changes.

Main Results:

  • Achieved an order-of-magnitude control over room-temperature conductance by mechanical strain.
  • Identified destructive quantum interference effects as the cause of large conductance variations.
  • Observed conductance modulation at double the driving frequency, confirming quantum interference.
  • Reported the largest gauge factor to date for single-molecule devices.

Conclusions:

  • Mechanical control of quantum interference in single molecules is feasible.
  • This mechanism enables highly sensitive, room-temperature mechanosensitive devices.
  • The findings pave the way for novel nanoscale sensing applications.