Flat edge modes of graphene and of Z2 topological insulator

Ken Ichiro Imura, Shijun Mao, Ai Yamakage, Yoshio Kuramoto

研究成果: Review article査読

6 被引用数 (Scopus)

抄録

A graphene nano-ribbon in the zigzag edge geometry exhibits a specific type of gapless edge modes with a partly flat band dispersion. We argue that the appearance of such edge modes are naturally understood by regarding graphene as the gapless limit of a Z2 topological insulator. To illustrate this idea, we consider both Kane-Mele (graphene-based) and Bernevig-Hughes-Zhang models: the latter is proposed for HgTe/CdTe 2D quantum well. Much focus is on the role of valley degrees of freedom, especially, on how they are projected onto and determine the 1D edge spectrum in different edge geometries.

本文言語English
論文番号358
ページ(範囲)1-6
ページ数6
ジャーナルNanoscale Research Letters
6
DOI
出版ステータスPublished - 2011

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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