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Mechanically controlled quantum interference in individual π-stacked dimers.

Riccardo Frisenda1, Vera A E C Janssen1, Ferdinand C Grozema2

  • 1Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands.

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|November 23, 2016
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Summary
This summary is machine-generated.

Destructive quantum interference in single-molecule junctions can be controlled by mechanically altering molecular conformation. This finding enables precise tuning of molecular conductance for novel electronic components.

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Area of Science:

  • Quantum mechanics
  • Molecular electronics
  • Chemical physics

Background:

  • Quantum interference significantly influences electronic conductance in molecular systems.
  • Understanding these quantum effects is crucial for developing molecular electronic components.
  • Previous studies confirmed destructive interference in single-molecule junctions.

Purpose of the Study:

  • To demonstrate the on/off control of destructive quantum interference in molecular systems.
  • To investigate the relationship between molecular conformation and conductance.
  • To explore the potential for designing tunable single-molecule electronic devices.

Main Methods:

  • Utilizing a combination of ab initio calculations.
  • Performing single-molecule conductance measurements.
  • Mechanically controlling the conformation of π-stacked molecular dimers.

Main Results:

  • Destructive quantum interference was observed to be controllable by mechanical manipulation.
  • A quasiperiodic destructive quantum-interference pattern was identified along breaking traces of π-stacked molecular dimers.
  • Molecular conductance was modulated over an order of magnitude with sub-ångström resolution.

Conclusions:

  • Mechanical control over molecular conformation allows for the tuning of quantum interference effects.
  • This provides a pathway for designing molecular electronic components with switchable conductance.
  • Exploiting structure-property relationships in π-stacked dimers is key for advanced molecular electronics.