Manifestation of LO-LA phonons in Raman scattering in graphene

被引：19
|
作者：
Ferone, Raffaello [1 ]
Wallbank, John R. [1 ]
Zolyomi, Viktor [1 ,2 ]
McCann, Edward [1 ]
Fal'ko, Vladimir I. [1 ]
机构：
[1] Univ Lancaster, Dept Phys, Lancaster LA1 4YB, England
[2] HAS, Res Inst Sol State Phys, H-1525 Budapest, Hungary
来源：
SOLID STATE COMMUNICATIONS | 2011年 / 151卷 / 16期
基金：
英国工程与自然科学研究理事会;
关键词：
Graphene; Carbon; Electron-phonon interactions; Raman spectroscopy; CARBON NANOTUBES; GRAPHITE; FILMS; LAYER;
D O I：
10.1016/j.ssc.2011.05.017
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
We analyze the spectral density of Raman scattering in graphene accompanied by the emission of a pair of LO or LA phonons from the corner of the Brillouin zone. Using a minimal tight-binding model approach, we find that the lineshape of the corresponding Raman signal consists of two peaks with a strongly non-Lorentzian (almost triangular) form with their width and the splitting between the peaks being strongly dependent on the energy of the incoming photon. The asymmetric lineshape is determined by the kinematics of the fully-resonant two-phonon process, and it reflects a strong anisotropy of LO-LA phonons' dispersion around the Brillouin zone corners. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1071 / 1074
页数：4
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