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Coherently controlled molecular junctions.

Uri Peskin1, Michael Galperin

  • 1Schulich Faculty of Chemistry and the Lise Meitner Center for Computational Quantum Chemistry, Technion-Israel Institute of Technology, Haifa 32000, Israel. uri@tx.technion.ac.il

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Summary
This summary is machine-generated.

Researchers demonstrate coherent control of charge flux in molecular junctions using laser-induced resonances. This method enables precise manipulation of electron flow in molecular devices like pumps and switches.

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Area of Science:

  • Quantum Chemistry
  • Molecular Electronics
  • Condensed Matter Physics

Background:

  • Molecular junctions offer potential for nanoscale electronic devices.
  • Controlling charge transport in these systems is crucial for device functionality.
  • Previous work explored light-induced currents and molecular pumps.

Purpose of the Study:

  • To investigate the coherent control of charge fluxes in unbiased molecular junctions.
  • To explore the use of laser-induced resonances for manipulating charge transport.
  • To generalize and extend existing models of light-driven molecular electronics.

Main Methods:

  • Development of a generic theoretical model for molecular junctions.
  • Analysis of resonant interactions between laser fields and molecular frequencies.
  • Simulation of donor-bridge-acceptor molecular complexes.
  • Consideration of two specific models: a charge pump and a molecular switch.

Main Results:

  • Demonstrated feasibility of coherent control over charge fluxes.
  • Identified resonance conditions between Rabi frequency and molecular frequencies.
  • Showcased control mechanisms for unbiased molecular junctions with symmetric coupling.
  • Numerical examples confirm the viability for realistic junction parameters.

Conclusions:

  • Coherent control of charge flux is achievable in molecular junctions.
  • Laser-induced resonances provide a powerful mechanism for charge manipulation.
  • The developed model offers a generalized framework for studying light-driven molecular transport.