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Nonconservative current-driven dynamics: beyond the nanoscale.

Brian Cunningham1, Tchavdar N Todorov1, Daniel Dundas1

  • 1Atomistic Simulation Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, U.K.

Beilstein Journal of Nanotechnology
|December 15, 2015
PubMed
Summary
This summary is machine-generated.

Metallic nanowires exhibit a "waterwheel effect" where atomic motion is driven by electrical current. This phenomenon involves self-regulation and electronic friction, leading to stable, nonconservative atomic dynamics.

Keywords:
atomic-scale conductorscurrent-induced forceselectronic transportfailure mechanismsnanoelectronic devicesnanomotors

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Metallic nanowires exhibit unique electronic properties due to their size.
  • Current-driven atomic motion is a key phenomenon in nanoscale systems.
  • Nonconservative forces can lead to complex atomic dynamics.

Purpose of the Study:

  • To intuitively explain the connection between the waterwheel effect and stimulated phonon emission.
  • To investigate the self-regulation mechanisms of waterwheel modes.
  • To characterize the nonlocality of current-induced forces in metallic systems.

Main Methods:

  • Nonadiabatic molecular dynamics simulations.
  • Analysis of vibrational frequencies and Kohn anomalies.
  • Development of an effective nonequilibrium dynamical response matrix.

Main Results:

  • Identified degenerate vibrational frequencies coupling to form exponentially growing nonequilibrium modes (waterwheel effect).
  • Demonstrated that waterwheel modes self-regulate by reducing current and populating nearby frequencies.
  • Showed that current-induced forces in metallic systems are long-ranged, particularly at low bias.

Conclusions:

  • The waterwheel effect provides an intuitive model for nonconservative current-driven atomic motion in metallic nanowires.
  • Dynamical steady states are achieved through self-regulation and electronic friction.
  • The long-ranged, nonlocal nature of these forces is crucial for understanding nanoscale atomic dynamics.