Twist-Induced New Phonon Scattering Pathways in Bilayer Graphene Probed by Helicity-Resolved Raman Spectroscopy

doi:10.1021/acs.jpcc.2c03372

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	Twist-Induced New Phonon Scattering Pathways in Bilayer Graphene Probed by Helicity-Resolved Raman Spectroscopy
	Xu, Bo 2,3; Hao, He 2; Huang, Jianqi 1; Zhao, Yan 2,3; Yang, Teng 1; Zhang, Jin 2; Tong, Lianming 2
刊名	JOURNAL OF PHYSICAL CHEMISTRY C
	2022-06-30
卷号	126 期号:25 页码:10487-10493
ISSN号	1932-7447
DOI	10.1021/acs.jpcc.2c03372
通讯作者	Tong, Lianming(tonglm@pku.edu.cn)
英文摘要	The electron density of state near saddle points in an electronic band structure is greatly enhanced, forming the wellknown Van Hove singularity (VHS), which leads to strengthened electron-photon coupling. However, the VHS-related electron- phonon interaction is rarely studied. Here we report the first observation of intra-mini valley phonon scattering pathways near the saddle points in twisted bilayer graphene (tBLG) through helicity-resolved Raman spectroscopy. Two new second-order Raman modes near the G peak are observed and assigned to combination modes of in-plane optical (TO, LO) and out-of-plane acoustic (ZA) mode, at similar to 1580 cm(-1) (TOZA) and similar to 1595 cm(-1) (LOZA), respectively. The twist-angle-dependence of their intensities and frequencies can be explained by double resonance Raman processes considering the fine electronic band structure of saddle points. Our findings provide a deeper understanding of the electronic band structure at saddle points of tBLG and enrich the VHS-related physics from an electron-phonon interaction point of view.
资助项目	Ministry of Science and Technology of China[2018YFA0703502] ; Ministry of Science and Technology of China[2016YFA0200104] ; Ministry of Science and Technology of China[2017YFA0206301] ; National Natural Science Foundation of China[52021006] ; National Natural Science Foundation of China[51720105003] ; National Natural Science Foundation of China[21790052] ; National Natural Science Foundation of China[21974004] ; National Natural Science Foundation of China[52031014] ; Strategic Priority Research Program of CAS[XDB36030100] ; Beijing National Laboratory for Molecular Sciences[BNLMS-CXTD-202001]
WOS研究方向	Chemistry ; Science & Technology - Other Topics ; Materials Science
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000819850000001
资助机构	Ministry of Science and Technology of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of CAS ; Beijing National Laboratory for Molecular Sciences
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/174960]
专题	金属研究所_中国科学院金属研究所
通讯作者	Tong, Lianming
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 2.Peking Univ, Ctr Nanochem, Beijing Sci & Engn Ctr Nanocarbons, Beijing Natl Lab Mol Sci,Coll Chem & Mol Engn, Beijing 100871, Peoples R China 3.Peking Univ, Acad Adv Interdisciplinary Studies, Beijing 100871, Peoples R China
推荐引用方式 GB/T 7714	Xu, Bo,Hao, He,Huang, Jianqi,et al. Twist-Induced New Phonon Scattering Pathways in Bilayer Graphene Probed by Helicity-Resolved Raman Spectroscopy[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2022,126(25):10487-10493.
APA	Xu, Bo.,Hao, He.,Huang, Jianqi.,Zhao, Yan.,Yang, Teng.,...&Tong, Lianming.(2022).Twist-Induced New Phonon Scattering Pathways in Bilayer Graphene Probed by Helicity-Resolved Raman Spectroscopy.JOURNAL OF PHYSICAL CHEMISTRY C,126(25),10487-10493.
MLA	Xu, Bo,et al."Twist-Induced New Phonon Scattering Pathways in Bilayer Graphene Probed by Helicity-Resolved Raman Spectroscopy".JOURNAL OF PHYSICAL CHEMISTRY C 126.25(2022):10487-10493.