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Electric-field-driven electron-transfer in mixed-valence molecules.

Enrique P Blair1, Steven A Corcelli2, Craig S Lent3

  • 1Department of Electrical and Computer Engineering, Baylor University, Waco, Texas 76798, USA.

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This summary is machine-generated.

Molecular quantum-dots enable computing via electron transfer (ET) in molecules. This study models ET rates, predicting terahertz frequencies for molecular computing devices, with minimal temperature dependence.

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Area of Science:

  • Molecular electronics
  • Quantum computing
  • Charge transport

Background:

  • Molecular quantum-dot cellular automata (MQCA) encode information in molecular charge configurations.
  • MQCA devices utilize intermolecular Coulombic coupling for computation.
  • Device operation depends on nonequilibrium electron transfer (ET) induced by time-varying electric fields.

Purpose of the Study:

  • To calculate the electric-field-driven ET rate for a model mixed-valence compound.
  • To explore relationships between molecular properties and driven ET rates under different field types.
  • To investigate the temperature dependence of ET rates in molecular systems.

Main Methods:

  • Modeled a mixed-valence molecule as a two-state electronic system coupled to a vibrational mode and a thermal environment.
  • Treated electronic and vibrational degrees-of-freedom quantum mechanically.
  • Used the Lindblad equation to model dissipative vibrational-bath interaction, capturing tunneling and nonadiabatic dynamics.

Main Results:

  • Calculated driven ET rates for abruptly switched and linearly ramped electric fields.
  • Found that the driven ET rate exhibits weak temperature dependence.
  • Predicted terahertz-range ET transfer rates for diferrocenylacetylene using model parameters.

Conclusions:

  • The developed model accurately captures quantum dynamics relevant to MQCA operation.
  • Molecular properties significantly influence driven ET rates, crucial for device design.
  • MQCA devices show potential for high-speed computation with predicted terahertz ET rates.