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Related Experiment Videos

Laser-induced currents along molecular wire junctions.

Ignacio Franco1, Moshe Shapiro, Paul Brumer

  • 1Chemical Physics Theory Group, Department of Chemistry and Center for Quantum Information and Quantum Control, University of Toronto, Toronto, Ontario M5S 3H6, Canada.

The Journal of Chemical Physics
|July 8, 2008
PubMed
Summary
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This study explores electron-vibrational interactions in molecular wires under laser fields. The dynamic Stark effect offers a robust mechanism for efficient electronic transport, unlike photon-absorption methods vulnerable to decoherence.

Area of Science:

  • Condensed matter physics
  • Quantum chemistry
  • Molecular electronics

Background:

  • Investigating electronic transport in molecular nanojunctions is crucial for molecular electronics.
  • Electron-vibrational interactions significantly influence charge transport properties.
  • Ultrafast laser fields offer precise control over molecular dynamics.

Purpose of the Study:

  • To investigate the effect of electron-vibrational interactions on laser-induced electronic transport in molecular wires.
  • To identify and analyze mechanisms for rectification in unbiased molecular nanojunctions.
  • To compare the robustness of different rectification mechanisms against decoherence.

Main Methods:

  • A mean-field mixed quantum-classical approximation was employed.

Related Experiment Videos

  • Photoinduced vibronic dynamics of trans-polyacetylene oligomers coupled to metallic leads were simulated.
  • An effective Schrödinger equation was derived for molecular orbitals using projective lead-molecule couplings.

    • Main Results:

    • Two rectification mechanisms were identified: near-resonance photon-absorption and the dynamic Stark effect.
    • The photon-absorption mechanism was found to be fragile to ultrafast electronic decoherence induced by vibrations.
    • The dynamic Stark effect mechanism demonstrated high efficiency and robustness against electron-vibrational interactions.

    Conclusions:

    • The dynamic Stark effect is a promising strategy for robust electronic rectification in molecular wires.
    • Understanding electron-vibrational coupling is essential for designing efficient molecular electronic devices.
    • Femtosecond laser fields can be utilized to control and optimize charge transport in molecular systems.