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Resonantly Enhanced Electromigration Forces for Adsorbates on Graphene.

Young Woo Choi1, Marvin L Cohen1

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Electromigration forces on graphene adsorbates depend on adsorbate energy levels. Resonant adsorbates experience enhanced electron wind forces, tunable via gating, offering control over nanoscale object behavior.

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Area of Science:

  • Condensed Matter Physics
  • Surface Science
  • Materials Science

Background:

  • Electromigration is crucial for nanoscale device reliability.
  • Understanding forces on adsorbates on 2D materials like graphene is essential.
  • Weakly bonded adsorbates present unique challenges in electromigration studies.

Purpose of the Study:

  • To investigate the electromigration forces acting on weakly bonded adsorbates situated on graphene.
  • To elucidate the relationship between adsorbate electronic structure and electromigration behavior.
  • To explore methods for tuning electromigration forces in graphene-based systems.

Main Methods:

  • Density-functional based calculations were employed.
  • Analysis focused on energy level alignment between adsorbate states and the graphene Fermi level.
  • Simulations considered both resonant and nonresonant adsorbate scenarios.

Main Results:

  • Electromigration force nature depends critically on adsorbate-graphene energy level alignment.
  • Resonant adsorbates exhibit dominant electron wind force, enhanced along electron flow.
  • Nonresonant adsorbates experience primarily direct force, dependent on adsorbate charge.
  • Electromigration forces for resonant adsorbates are tunable via electrostatic gating.

Conclusions:

  • Adsorbate energy level alignment dictates electromigration force characteristics on graphene.
  • Electron wind force is significant for resonant adsorbates, irrespective of charge.
  • Electrostatic gating offers a pathway to control electromigration forces for resonant adsorbates.
  • Findings provide insights for managing nanoscale object behavior on host materials.