Phonons of graphene and graphitic materials derived from the empirical potential LCBOPII

SURFACE SCIENCE

卷:605

Article

Karssemeijer, L. J.¹  Fasolino, Annalisa¹ 

[1] Radboud Univ Nijmegen, Inst Mol & Mat, NL-6525 AJ Nijmegen, Netherlands

关键词: Phonons;    Graphene;    Graphite;    Force constants;    LCBOPII;    Bending rigidity;   

DOI  :  10.1016/j.susc.2010.10.036

来源: Elsevier

【 摘 要 】

We present the interatomic force constants and phonon dispersions of graphite and graphene from the LCBOPII empirical bond order potential. We find a good agreement with experimental results, particularly in comparison to other bond order potentials. From the flexural mode we determine the bending rigidity of graphene to be 0.69 eV at zero temperature. We discuss the large increase of this constant with temperature and argue that derivation of force constants from experimental values should take this feature into account. We examine also other graphitic systems, including multilayer graphene for which we show that the splitting of the flexural mode can provide a tool for characterization. (C) 2010 Elsevier B.V. All rights reserved.

【 授权许可】

Free