Gap states and edge properties of rectangular graphene quantum dot in staggered potential

Y. H. Jeong, Sung Ryul Yang

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We investigate edge properties of a gapful rectangular graphene quantum dot in a staggered potential. In such a system gap states with discrete and closely spaced energy levels exist that are spatially located on the left or right zigzag edge. We find that, although the bulk states outside the energy gap are nearly unaffected, spin degeneracy of each gap state is lifted by the staggered potential. We have computed the occupation numbers of spin-up and -down gap states at various values of the strength of the staggered potential. The electronic and magnetic properties of the zigzag edges depend sensitively on these numbers. We discuss the possibility of applying this system as a single electron spintronic device.

Original languageEnglish
Pages (from-to)283-288
Number of pages6
JournalJournal of the Korean Physical Society
Volume71
Issue number5
DOIs
Publication statusPublished - 2017 Sep 1

Keywords

  • Edge reconstruction
  • Gap states
  • Graphene quantum dot
  • Staggered potential

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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