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Harnessing Quantum Interference in Molecular Dielectric Materials.

Justin P Bergfield1, Henry M Heitzer1, Colin Van Dyck1

  • 1†Department of Chemistry and the Materials Research Center, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States.

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Summary
This summary is machine-generated.

Quantum interference significantly impacts charge transport in molecular materials, enabling large current reductions without altering dielectric properties. This finding allows for the design of materials with reduced leakage currents.

Keywords:
cross-conjugated polymersdensity functional theorymolecular dielectric materialnonequilibrium quantum transportquantum interference

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Area of Science:

  • Molecular electronics
  • Quantum transport phenomena
  • Materials science

Background:

  • Understanding charge transport and dielectric response is crucial for molecular materials.
  • Quantum coherent effects can influence electronic properties in nanoscale systems.

Purpose of the Study:

  • Investigate the interplay between dielectric response and charge transport in molecular materials operating under quantum coherence.
  • Explore the role of quantum interference in modulating these properties.

Main Methods:

  • Utilized ab initio electronic structure theory to compute conductance and dielectric constants.
  • Calculated properties for cross-conjugated anthraquinone (AQ)-based and linearly conjugated anthracene (AC)-based molecular materials.
  • Compared theoretical predictions with experimental measurements.

Main Results:

  • Quantum interference affects charge transport and dielectric response differently.
  • Observed a ~50-fold reduction in conductance for AQ-based materials compared to AC-based materials, with minimal change in dielectric constants.
  • Achieved excellent agreement between calculated and measured conductance values.

Conclusions:

  • Quantum interference offers a pathway to tune charge transport independently of dielectric behavior in molecular materials.
  • Proposed novel molecular materials for reducing leakage currents in nanoscale gaps.
  • Demonstrated the potential for designing materials with high dielectric constants and low conductance.