Ab initio molecular-dynamics simulation of neuromorphic computing in phase-change memory materials

Jonathan Skelton, Desmond Loke, Taehoon Lee, Stephen Elliott

Research output: Contribution to journalArticle

17 Citations (Scopus)
155 Downloads (Pure)

Abstract

We present an in silico study of the neuromorphic-computing behavior of the prototypical phase-change material, Ge2Sb2Te5, using ab initio molecular-dynamics simulations. Stepwise changes in structural order in response to temperature pulses of varying length and duration are observed, and a good reproduction of the spike-timing-dependent plasticity observed in nanoelectronic synapses is demonstrated. Short above-melting pulses lead to instantaneous loss of structural and chemical order, followed by delayed partial recovery upon structural relaxation. We also investigate the link between structural order and electrical and optical properties. These results pave the way towards a first-principles understanding of phase-change physics beyond binary switching.
Original languageEnglish
Pages (from-to)14223–14230
Number of pages8
JournalACS Applied Materials and Interfaces
Volume7
Issue number26
Early online date23 Jun 2015
DOIs
Publication statusPublished - 8 Jul 2015

Keywords

  • brain-inspired/neuromorphic computing
  • phase-change materials
  • computational modelling
  • ab initio molecular-dynamics simulation
  • electronic synapse

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