Localized vibrational, edges and breathing modes of graphene nanoribbons with topological line defects

Release Time:2025-04-30  Hits:

• Date:2025-04-30
• Title of Paper:Localized vibrational, edges and breathing modes of graphene nanoribbons with topological line defects
• Journal:Eur. Phys. J. B
• Summary:Peculiar vibrational modes of graphene nanoribbons (GNRs) with topological line defects were
  presented. We find that phonon dispersion relations of the topological defective GNRs are more similar to
  those of perfect armchair-edge GNR than to zigzag-edge GNR in spite of their zigzag edge. All vibrational
  modes at Γ point are assigned in detail by analyzing their eigenvectors and are presented by video.
  Three types of characteristic vibrational modes, namely, localized vibrational modes in defect sites, edges,
  and breathing modes, are observed. Five localized vibrational modes near the defect sites are found to
  be robust against the width of the topological line-defective GNR. The Raman D’ band just originates
  from one localized mode, 1622 cm^−1. The vibrational mode is sensitive to symmetry. The edge modes
  are related with structural symmetry but not with widths. Two edge modes are asymmetrical and only
  one is symmetrical. The breathing modes are inversely proportional to the width for wide-defect GNRs,
  and inversely proportional to the square root of the width for narrow-defect GNRs. The breathing mode
  frequencies of defective GNRs are slightly higher than those of perfect GNRs. These vibrational modes
  may be useful in the manipulation of thermal conductance and implementation of single phonon storage.
• Co-author:M. G. Xia*, Z. D. Su, Y. Song, J. Y. Han, S. L. Zhang, and B. W. Li
• Volume:86
• Page Number:344
• Translation or Not:No
• Date of Publication:2013-08-05