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Quantum interference and decoherence in single-molecule junctions: how vibrations induce electrical current.

R Härtle1, M Butzin, O Rubio-Pons

  • 1Institut für Theoretische Physik und Interdisziplinäres Zentrum für Molekulare Materialien, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstr. 7/B2, D-91058 Erlangen, Germany.

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Summary
This summary is machine-generated.

Quantum interference in single-molecule junctions is quenched by electronic-vibrational coupling, leading to increased electrical currents. This decoherence effect is pronounced in vibrationally excited junctions.

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Area of Science:

  • Quantum mechanics
  • Molecular electronics
  • Condensed matter physics

Background:

  • Single-molecule junctions exhibit quantum interference in electron transport through quasidegenerate states.
  • Understanding decoherence mechanisms is crucial for controlling quantum phenomena in molecular systems.

Purpose of the Study:

  • To analyze quantum interference and decoherence in single-molecule junctions.
  • To investigate the role of electronic-vibrational coupling in modulating interference effects.
  • To determine the impact of decoherence on electrical currents within molecular junctions.

Main Methods:

  • Utilizing a nonequilibrium Green's function approach.
  • Modeling electron tunneling through quasidegenerate molecular states.
  • Analyzing the influence of electronic-vibrational coupling on quantum interference.

Main Results:

  • Electronic-vibrational coupling strongly suppresses quantum interference effects.
  • Decoherence induced by vibrational coupling leads to significantly larger electrical currents.
  • This effect is particularly pronounced in vibrationally highly excited molecular junctions.

Conclusions:

  • Electronic-vibrational coupling acts as a primary decoherence mechanism in single-molecule junctions.
  • Decoherence can enhance electrical current, especially under resonant transport conditions with inelastic processes.
  • The findings offer insights into controlling charge transport in molecular electronic devices.