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Destructive quantum interference in transport through molecules with electron-electron and electron-vibration

P Roura-Bas1, F Güller2, L Tosi3

  • 1Centro Atómico Bariloche and Instituto Balseiro, Comisión Nacional de Energía Atómica, CONICET, 8400 Bariloche, Argentina.

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Summary
This summary is machine-generated.

Quantum interference effects in molecular junctions persist despite molecular vibrations when Coulomb repulsion is considered. This enables significant conductance changes, crucial for developing novel quantum interference effect transistors.

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Area of Science:

  • Quantum phenomena in condensed matter physics.
  • Molecular electronics and nanoscale devices.

Background:

  • Molecular junctions can exhibit quantum interference effects that influence electron transport.
  • Molecular vibrations and Coulomb repulsion are key factors affecting charge transport.

Purpose of the Study:

  • To investigate the persistence of quantum interference in molecular junctions with vibrations and Coulomb repulsion.
  • To explore the tunability of conductance in such systems.

Main Methods:

  • Theoretical study of electron transport through a molecular junction.
  • Inclusion of molecular vibrations and Coulomb repulsion in the transport model.
  • Analysis of conductance changes under varying molecular levels and coupling configurations.

Main Results:

  • Quantum interference effects are observable even with molecular vibrations, provided Coulomb repulsion is included.
  • Conductance can be modulated over several orders of magnitude in the Kondo regime.
  • Achieved conductance values range from destructive interference to 2e²/h.
  • Observed large conductance changes are robust against temperature and voltage variations.

Conclusions:

  • Molecular junctions can maintain quantum interference effects under realistic conditions (vibrations, Coulomb repulsion).
  • The tunability of conductance is significant, paving the way for advanced electronic components.
  • Findings are relevant for the design of molecular quantum interference effect transistors.