Spintronic properties of one-dimensional electron gas in graphene armchair ribbons

J. W. Lee, S. C. Kim, S. R. Eric Yang

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

We have investigated, using effective mass approach (EMA), magnetic properties of a one-dimensional electron gas in graphene armchair ribbons when the electrons occupy only the lowest conduction subband. We find that magnetic properties of the one-dimensional electron gas may depend sensitively on the width of the ribbon. For ribbon widths Lx=3 Ma0, a critical point separates ferromagnetic and paramagnetic states while for Lx=(3M1) a0 paramagnetic state is stable (M is an integer and a 0 is the length of the unit cell). These width-dependent properties are a consequence of eigenstates that have a subtle width-dependent mixture of K and K′ states, and can be understood by examining the wavefunction overlap that appears in the expression for the many-body exchange self-energy. Ferromagnetic and paramagnetic states may be used for spintronic purposes.

Original languageEnglish
Pages (from-to)1929-1932
Number of pages4
JournalSolid State Communications
Volume152
Issue number21
DOIs
Publication statusPublished - 2012 Nov

Keywords

  • A. Armchair ribbon
  • C. One-dimensional electron gas
  • D. Ferromagnetism

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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