Observation of Low-Frequency Combination and Overtone Raman Modes in Misoriented Graphene

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	Observation of Low-Frequency Combination and Overtone Raman Modes in Misoriented Graphene
	Wu, JX ; Xu, H ; Mu, WH ; Xie, LM ; Ling, X ; Kong, J ; Dresselhaus, MS ; Zhang, J
刊名	JOURNAL OF PHYSICAL CHEMISTRY C
	2014
卷号	118 期号:7 页码:3636
ISSN号	1932-7447
通讯作者	Zhang, J (reprint author), Peking Univ, Ctr Nanochem, Beijing Natl Lab Mol Sci, Key Lab Phys & Chem Nanodevices,Coll Chem & Mol E, Beijing 100871, Peoples R China.
中文摘要	Stacking disorder will significantly modify the optical properties and interlayer coupling stretch of few-layer graphene. Here, we report the observation of the Raman breathing modes in the low-frequency range of 100-200 cm(-1) in misoriented few-layer graphene on a SiO2/Si substrate. Two dominant Raman modes are identified. The one at similar to 120 cm(-1) is assigned as the E-g + ZO' combination mode of the in-plane shear and the out-of-plane interlayer optical phonon breathing modes. Another peak at similar to 182 cm(-1) is identified as the overtone mode 2ZO'. The appearance of these Raman modes for different twist angles indicates that stacking disorder in few-layer graphene significantly alters the Raman feature, especially for those combination modes containing the interlayer breathing mode. Further investigation shows that the two Raman vibrational modes (similar to 120 and similar to 182 cm(-1)) are strongly coupled to the excitation laser energy, but their frequencies are independent of the number of graphene layers before folding. The present work provides a sensitive way to study the phonon dispersion, electron-phonon interaction, and electronic band structure of misoriented graphene layers.
资助信息	NSFC [21233001, 21129001, 51272006, 51121091, 11074259, 11374310, 91027045]; MOST [2011YQ0301240201, 2011CB932601]; NSF [6921903]; [NSF/DMR-0845358]
语种	英语
公开日期	2015-04-14
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/59252]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Wu, JX,Xu, H,Mu, WH,et al. Observation of Low-Frequency Combination and Overtone Raman Modes in Misoriented Graphene[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2014,118(7):3636.
APA	Wu, JX.,Xu, H.,Mu, WH.,Xie, LM.,Ling, X.,...&Zhang, J.(2014).Observation of Low-Frequency Combination and Overtone Raman Modes in Misoriented Graphene.JOURNAL OF PHYSICAL CHEMISTRY C,118(7),3636.
MLA	Wu, JX,et al."Observation of Low-Frequency Combination and Overtone Raman Modes in Misoriented Graphene".JOURNAL OF PHYSICAL CHEMISTRY C 118.7(2014):3636.