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题名: Observation of Low-Frequency Combination and Overtone Raman Modes in Misoriented Graphene
作者: Wu, JX ;  Xu, H ;  Mu, WH ;  Xie, LM ;  Ling, X ;  Kong, J ;  Dresselhaus, MS ;  Zhang, J
刊名: JOURNAL OF PHYSICAL CHEMISTRY C
出版日期: 2014
卷号: 118, 期号:7, 页码:3636-3643
关键词: TWISTED BILAYER GRAPHENE ;  CARBON NANOTUBES ;  SPECTROSCOPY ;  SCATTERING ;  GRAPHITE ;  SUPERLATTICES ;  EDGES
学科分类: Physics
DOI: 10.1021/jp411573c
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.
部门归属: [Wu, Juanxia; Xu, Hua; Zhang, Jin] Peking Univ, Ctr Nanochem, Beijing Natl Lab Mol Sci, Key Lab Phys & Chem Nanodevices,Coll Chem & Mol E, Beijing 100871, Peoples R China; [Wu, Juanxia] Peking Univ, Acad Adv Interdisciplinary Studies, Beijing 100871, Peoples R China; [Mu, Weihua] Chinese Acad Sci, State Key Lab Theoret Phys, Inst Theoret Phys, Kavli Inst Theoret Phys China, Beijing 100190, Peoples R China; [Mu, Weihua] MIT, Dept Chem, Cambridge, MA 02139 USA; [Xie, Liming] Chinese Acad Sci, Key Lab Standardizat & Measurement Nanotechnol, Natl Ctr Nanosci & Technol, Beijing 100190, Peoples R China; [Ling, Xi; Kong, Jin; Dresselhaus, Mildred S.] MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA
英文摘要: 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.
资助者: NSFC [21233001, 21129001, 51272006, 51121091, 11074259, 11374310, 91027045]; MOST [2011YQ0301240201, 2011CB932601]; NSF [6921903]; [NSF/DMR-0845358]
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000331861700030
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/15474
Appears in Collections:理论物理所2014年知识产出 _期刊论文

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Recommended Citation:
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):3636-3643.
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