Strain-dependent splitting of the double-resonance Raman scattering band in graphene.
Strain-dependent splitting of the double-resonance Raman scattering band in graphene.
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DOI：
10.1103/physrevlett.106.155502
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发表时间：
2011-03
影响因子：
8.6
通讯作者：
D. Yoon;Y. Son;H. Cheong
中科院分区：
文献类型：
--
作者：
D. Yoon;Y. Son;H. Cheong
在均匀的单轴应变下，石墨烯的拉曼二维谱带在双声子双共振散射过程中分裂成两个峰，并且它们随应变的方向和大小发生强烈的红移。通过偏振显微拉曼测量和第一性原理计算，结果表明，由于扭曲的狄拉克锥和单轴应变下的声子色散的各向异性修改的共振条件的显着变化起源的影响。计算和实验之间的定量协议，使我们能够确定占主导地位的双共振拉曼散射路径，从而回答了一个基本问题，这个关键的实验分析工具石墨系统。
Under homogeneous uniaxial strains, the Raman 2D band of graphene involving two-phonon double-resonance scattering processes splits into two peaks and they altogether redshift strongly depending on the direction and magnitude of the strain. Through polarized micro-Raman measurements and first-principles calculations, the effects are shown to originate from significant changes in resonant conditions owing to both the distorted Dirac cones and anisotropic modifications of phonon dispersion under uniaxial strains. Quantitative agreements between the calculation and experiment enable us to determine the dominant double-resonance Raman scattering path, thereby answering a fundamental question concerning this key experimental analyzing tool for graphitic systems.