Twist-Induced New Phonon Scattering Pathways in Bilayer Graphene Probed by Helicity-Resolved Raman Spectroscopy
文献类型：期刊论文
| 作者 | Xu, Bo1,3; Hao, He3; Huang, Jianqi2; Zhao, Yan1,3; Yang, Teng2; Zhang, Jin3; Tong, Lianming3 |
| 刊名 | JOURNAL OF PHYSICAL CHEMISTRY C
 |
| 出版日期 | 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 |
| WOS记录号 | WOS:000819850000001 |
| 出版者 | AMER CHEMICAL SOC |
| 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 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/174957]  |
| 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.Peking Univ, Acad Adv Interdisciplinary Studies, Beijing 100871, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 3.Peking Univ, Ctr Nanochem, Beijing Sci & Engn Ctr Nanocarbons, Beijing Natl Lab Mol Sci,Coll Chem & Mol Engn, 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. |
入库方式： OAI收割
来源：金属研究所
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