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Related Experiment Videos

Pair Tunneling through Single Molecules.

Jens Koch1, M E Raikh, Felix von Oppen

  • 1Institut für Theoretische Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany.

Physical Review Letters
|February 21, 2006
PubMed
Summary
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Electron pair tunneling dominates charge transport in molecules with negative charging energy, leading to unique current-voltage characteristics distinct from conventional Coulomb blockade. This phenomenon enables gate-controlled rectification and switching in asymmetric junctions.

Area of Science:

  • Quantum chemistry
  • Molecular electronics
  • Condensed matter physics

Background:

  • Polaronic energy shifts can lead to negative effective charging energies in molecules.
  • This favors ground states with an even number of electrons.

Purpose of the Study:

  • Investigate charge transport mechanisms in molecules with negative charging energy.
  • Explore the impact of electron pair tunneling on current-voltage characteristics.
  • Examine the potential for gate-controlled functionalities in asymmetric junctions.

Main Methods:

  • Theoretical analysis of charge transport.
  • Modeling of tunneling phenomena (single-electron and electron pair).
  • Simulation of current-voltage characteristics near ground-state degeneracies.

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Main Results:

  • Charge transport is dominated by electron pair tunneling, coexisting with single-electron cotunneling.
  • Current-voltage characteristics show significant deviations from conventional Coulomb blockade due to restricted phase space for pair tunneling.
  • Asymmetric junctions exhibit gate-controlled current rectification and switching.

Conclusions:

  • Electron pair tunneling is a key transport mechanism in molecules with negative charging energy.
  • The unique transport properties offer new possibilities for molecular electronic devices.
  • Gate-controlled rectification and switching are achievable using pair tunneling in asymmetric systems.