Core-protective half-metallicity in trilayer graphene nanoribbons

Gi Wan Jeon, Kyu Won Lee, Cheol Eui Lee

Research output: Contribution to journalArticle

Abstract

Half-metals, playing an important role in spintronics, can be described as materials that enable fully spin-polarized electrical current. Taking place in graphene-based materials, half-metallicity has been shown in zigzag-edged graphene nanoribbons (ZGNRs) under an electric field. Localized electron states on the edge carbons are a key to enabling half-metallicity in ZGNRs. Thus, modification of the localized electron states is instrumental to the carbon-based spintronics. Our simple model shows that in a trilayer ZGNRs (triZGNRs) only the middle layer may become half-metallic leaving the outer layers insulating in an electric field, as confirmed by our density functional theory (DFT) calculations. Due to the different circumstances of the edge carbons, the electron energies at the edge carbons are different near the Fermi level, leading to a layer-selective half-metallicity. We believe that triZGNRs can be the tiniest electric cable (nanocable) form and can open a route to graphene-based spintronics applications.

Original languageEnglish
Pages (from-to)14-17
Number of pages4
JournalPhysica B: Condensed Matter
Volume516
DOIs
Publication statusPublished - 2017 Jul 1

Keywords

  • Electric nanocable
  • Enhanced half-metallicity
  • First-principles calculations
  • Trilayer graphene nanoribbons

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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