Direct Observation of Topological Phonons in Graphene

doi:10.1103/PhysRevLett.131.116602

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	Direct Observation of Topological Phonons in Graphene
	Li, Jiade 1,2,5; Li, Jiangxu 3; Tang, Jilin 4,6; Tao, Zhiyu 1,2,5; Xue, Siwei 1,2; Liu, Jiaxi 3; Peng, Hailin 4,6; Chen, Xing-Qiu 3; Guo, Jiandong 1,2,5,7; Zhu, Xuetao 1,2,5,7
通讯作者	Peng, Hailin(hlpeng@pku.edu.cn)
	2023-09-14
发表期刊	PHYSICAL REVIEW LETTERS
ISSN	0031-9007
卷号	131 期号:11 页码:6
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.
资助者	National Key R&D Program of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences
DOI	10.1103/PhysRevLett.131.116602
收录类别	SCI
语种	英语
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
WOS类目	Physics, Multidisciplinary
WOS记录号	WOS:001151626500006
出版者	AMER PHYSICAL SOC
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/183994
专题	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.