Optical absorption spectra in ABC-stacked graphene superlattice

Chih Wei Chiu, Yuan Cheng Huang, Feng Lin Shyu, Ming Fa Lin

研究成果: Article同行評審

7 引文 斯高帕斯(Scopus)

摘要

The band structures in ABC-stacked graphene superlattice include linear and parabolic bands with and without degeneracy. Two of the three-pair band-edge states are located at the symmetric points of the first Brillouin zone, while the other is near the points. These band-edge states can induce prominent structures in the joint density of states (D J) which exhibits one peak with two shoulders at middle frequency and one peak at low frequency. The square of the velocity matrix element has the greatest values at the symmetric points. It makes the optical absorption spectra (A(ω)) not to fully reflect the D J structures. The middle-frequency structures become two sharper peaks and the low-frequency peak disappears in A(ω), and A(ω) for the parallel polarization is much stronger than that for the vertical polarization. The spectra contrast sharply with those of AA- and AB-stacked systems, and some of the calculated results could be verified the experimental measurements.

原文English
頁(從 - 到)800-804
頁數5
期刊Synthetic Metals
162
發行號9-10
DOIs
出版狀態Published - 2012 六月

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 凝聚態物理學
  • 材料力學
  • 機械工業
  • 金屬和合金
  • 材料化學

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