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Understanding quantum interference in coherent molecular conduction.

Gemma C Solomon1, David Q Andrews, Thorsten Hansen

  • 1Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA. g-solomon@northwestern.edu

The Journal of Chemical Physics
|August 14, 2008
PubMed
Summary
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This study extends electronic coupling theory to molecular electronics, using scattering theory to explain unusual electron transport through cross-conjugated molecules and substituted benzene rings.

Area of Science:

  • Molecular electronics
  • Quantum chemistry
  • Surface science

Background:

  • Electron transfer through molecules is key to molecular electronics.
  • Current understanding faces challenges with complex molecular systems.
  • Interpreting experimental data requires new theoretical frameworks.

Purpose of the Study:

  • To extend the concept of electronic coupling to molecular junctions.
  • To apply scattering theory (Landauer formalism) to molecular transport.
  • To explain unusual transport phenomena in cross-conjugated systems.

Main Methods:

  • Extending electronic coupling theory from intramolecular electron transfer.
  • Applying the scattering theory (Landauer) formalism.
  • Developing a sum-over-independent-channels approach.

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Main Results:

  • A new theoretical framework for molecular junction transport.
  • Explanation for unusual transport features in cross-conjugated molecules.
  • Understanding substituent effects (ortho, meta, para) on benzene rings.

Conclusions:

  • The extended electronic coupling concept provides a powerful tool for molecular electronics.
  • Scattering theory offers a robust method for analyzing junction transport.
  • This work bridges theoretical chemistry and experimental observations in molecular devices.