Multiscale simulations of electron and ion dynamics in self-irradiated silicon

Cheng Wei Lee, James A. Stewart, Rémi Dingreville, Stephen M. Foiles, André Schleife

Research output: Contribution to journalArticlepeer-review

Abstract

The interaction of energetic ions with the electronic and ionic system of target materials is an interesting but challenging multiscale problem, and understanding of the early stages after impact of heavy, initially charged ions is particularly poor. At the same time, energy deposition during these early stages determines later formation of damage cascades. We address the multiscale character by combining real-time time-dependent density functional theory for electron dynamics with molecular dynamics simulations of damage cascades. Our first-principles simulations prove that core electrons affect electronic stopping and have an unexpected influence on the charge state of the projectile. We show that this effect is absent for light projectiles, but dominates the stopping physics for heavy projectiles. By parametrizing an inelastic energy loss friction term in the molecular dynamics simulations using our first-principles results, we also show a qualitative influence of electronic stopping physics on radiation-damage cascades.

Original languageEnglish (US)
Article number024107
JournalPhysical Review B
Volume102
Issue number2
DOIs
StatePublished - Jul 1 2020

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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