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Electronic friction in interacting systems.

Feng Chen1, Kuniyuki Miwa2, Michael Galperin2

  • 1Department of Physics, University of California San Diego, La Jolla, San Diego, California 92093, USA.

The Journal of Chemical Physics
|May 10, 2019
PubMed
Summary
This summary is machine-generated.

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Strong light-matter interactions significantly impact electronic friction in molecular junctions. Researchers found friction can be controlled by adjusting bias and cavity pumping, offering new engineering possibilities for molecular devices.

Area of Science:

  • Condensed Matter Physics
  • Quantum Chemistry
  • Nanoscience

Background:

  • Electronic friction in molecular junctions is crucial for understanding energy dissipation.
  • Strong light-matter interactions can significantly alter electronic properties.
  • Accurate theoretical models are needed to capture these effects.

Purpose of the Study:

  • To investigate the impact of strong light-matter interaction on electronic friction in single-molecule nanocavity junctions.
  • To compare the accuracy of different theoretical approaches, including Hubbard nonequilibrium Green function (NEGF) and generalized Head-Gordon and Tully (HGT).
  • To explore the influence of external bias and cavity mode pumping on electronic friction.

Main Methods:

  • Utilizing Hubbard nonequilibrium Green function (NEGF) simulations.

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  • Comparing NEGF results with mean-field NEGF and generalized HGT methods.
  • Analyzing the effects of bias voltage and cavity field intensity.

    • Main Results:

    • Mean-field NEGF inaccurately describes strong intrasystem interactions.
    • Generalized HGT is limited to specific conditions with negligible bath-induced coherences.
    • Electronic friction exhibits nonmonotonic behavior with respect to bias and pumping field intensity.
    • Demonstrated control over electronic friction through cavity mode pumping.

    Conclusions:

    • Strong light-matter interactions necessitate advanced simulation methods beyond mean-field approaches.
    • The generalized HGT method has limitations in capturing complex quantum phenomena.
    • Electronic friction in molecular junctions can be engineered, opening avenues for novel device applications.