Direct Observation of Topological Phonons in Graphene
文献类型：期刊论文
| 作者 | Li, Jiade1,2,5; Li, Jiangxu3; Tang, Jilin4,6; Tao, Zhiyu1,2,5; Xue, Siwei1,2; Liu, Jiaxi3; Peng, Hailin4,6; Chen, Xing-Qiu3; Guo, Jiandong1,2,5,7; Zhu, Xuetao1,2,5,7 |
| 刊名 | PHYSICAL REVIEW LETTERS
 |
| 出版日期 | 2023-09-14 |
| 卷号 | 131期号:11页码:6 |
| ISSN号 | 0031-9007 |
| DOI | 10.1103/PhysRevLett.131.116602 |
| 通讯作者 | Peng, Hailin(hlpeng@pku.edu.cn) |
| 英文摘要 | Phonons, as the most fundamental emergent bosons in condensed matter systems, play an essential role in the thermal, mechanical, and electronic properties of crystalline materials. Recently, the concept of topology has been introduced to phonon systems, and the nontrivial topological states also exist in phonons due to the constraint by the crystal symmetry of the space group. Although the classification of various topological phonons has been enriched theoretically, experimental studies were limited to several threedimensional (3D) single crystals with inelastic x-ray or neutron scatterings. The experimental evidence of topological phonons in two-dimensional (2D) materials is absent. Here, using high-resolution electron energy loss spectroscopy following our theoretical predictions, we directly map out the phonon spectra of the atomically thin graphene in the entire 2D Brillouin zone, and observe two nodal-ring phonons and four Dirac phonons. The closed loops of nodal-ring phonons and the conical structure of Dirac phonons in 2D momentum space are clearly revealed by our measurements, in nice agreement with our theoretical calculations. The ability of 3D mapping (2D momentum space and energy space) of phonon spectra opens up a new avenue to the systematic identification of the topological phononic states. Our work lays a solid foundation for potential applications of topological phonons in superconductivity, dynamic instability, and phonon diode. |
| 资助项目 | National Key R&D Program of China[2021YFA1400200] ; National Key R&D Program of China[2021FB3501503] ; National Key R&D Program of China[2022YFA1403000] ; National Natural Science Foundation of China[12274446] ; National Natural Science Foundation of China[52021006] ; National Natural Science Foundation of China[T2188101] ; National Natural Science Foundation of China[51725103] ; National Natural Science Foundation of China[52188101] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB33000000] |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:001151626500006 |
| 出版者 | AMER PHYSICAL SOC |
| 资助机构 | National Key R&D Program of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences |
| 源URL |  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 通讯作者 | Peng, Hailin |
| 作者单位 | 1.Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China 2.Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China 3.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 4.Peking Univ, Coll Chem & Mol Engn, Beijing Sci & Engn Ctr Nanocarbons, Beijing Natl Lab Mol Sci,Ctr Nanochem, Beijing 100871, Peoples R China 5.Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China 6.Beijing Graphene Inst BGI, Beijing 100095, Peoples R China 7.Songshan Lake Mat Lab, Dongguan 523808, Guangdong, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Jiade,Li, Jiangxu,Tang, Jilin,et al. Direct Observation of Topological Phonons in Graphene[J]. PHYSICAL REVIEW LETTERS,2023,131(11):6. |
| APA | Li, Jiade.,Li, Jiangxu.,Tang, Jilin.,Tao, Zhiyu.,Xue, Siwei.,...&Zhu, Xuetao.(2023).Direct Observation of Topological Phonons in Graphene.PHYSICAL REVIEW LETTERS,131(11),6. |
| MLA | Li, Jiade,et al."Direct Observation of Topological Phonons in Graphene".PHYSICAL REVIEW LETTERS 131.11(2023):6. |
入库方式： OAI收割
来源：金属研究所
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