Observation of chiral and slow plasmons in twisted bilayer graphene

doi:10.1038/s41586-022-04520-8

IMR OpenIR

	Observation of chiral and slow plasmons in twisted bilayer graphene
	Huang, Tianye 1; Tu, Xuecou 1; Shen, Changqing 2; Zheng, Binjie 1; Wang, Junzhuan 1; Wang, Hao 3; Khaliji, Kaveh 4; Park, Sang Hyun 4; Liu, Zhiyong 5; Yang, Teng 5; Zhang, Zhidong 5; Shao, Lei 3; Li, Xuesong 2,6; Low, Tony 4,7; Shi, Yi 1; Wang, Xiaomu 1
通讯作者	Li, Xuesong() ; Low, Tony() ; Shi, Yi() ; Wang, Xiaomu()
	2022-05-05
发表期刊	NATURE
ISSN	0028-0836
卷号	605 期号:7908 页码:63-+
摘要	Moire superlattices have led to observations of exotic emergent electronic properties such as superconductivity and strong correlated states in small-rotation-angle twisted bilayer graphene (tBLG)(1,2). Recently, these findings have inspired the search for new properties in moire plasmons. Although plasmon propagation in the tBLG basal plane has been studied by near-field nano-imaging techniques(3-7), the general electromagnetic character and properties of these plasmons remain elusive. Here we report the direct observation of two new plasmon modes in macroscopic tBLG with a highly ordered moire superlattice. Using spiral structured nanoribbons of tBLG, we identify signatures of chiral plasmons that arise owing to the uncompensated Berry flux of the electron gas under optical pumping. The salient features of these chiral plasmons are shown through their dependence on optical pumping intensity and electron fillings, in conjunction with distinct resonance splitting and Faraday rotation coinciding with the spectral window of maximal Berry flux. Moreover, we also identify a slow plasmonic mode around 0.4 electronvolts, which stems from the interband transitions between the nested subbands in lattice-relaxed AB-stacked domains. This mode may open up opportunities for strong light-matter interactions within the highly sought after mid-wave infrared spectral window(8). Our results unveil the new electromagnetic dynamics of small-angle tBLG and exemplify it as a unique quantum optical platform.
资助者	National Key R&D Program of China ; National Natural Science Foundation of China ; Program for High-Level Entrepreneurial and Innovative Talent Introduction of Jiangsu Province ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Fundamental Research Funds for the Central Universities ; Shenzhen Science and Technology Program ; National Natural Science Foundation of China (NSAF)
DOI	10.1038/s41586-022-04520-8
收录类别	SCI
语种	英语
资助项目	National Key R&D Program of China[2018YFA0307300] ; National Key R&D Program of China[2018YFA0209100] ; National Key R&D Program of China[2017YFA0206301] ; National Natural Science Foundation of China[61934004] ; National Natural Science Foundation of China[62005119] ; Program for High-Level Entrepreneurial and Innovative Talent Introduction of Jiangsu Province ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB30000000] ; Fundamental Research Funds for the Central Universities ; Shenzhen Science and Technology Program[(2021)105] ; National Natural Science Foundation of China (NSAF)[U1930402]
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:000790960500015
出版者	NATURE PORTFOLIO
引用统计	被引频次：67[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/173957
专题	中国科学院金属研究所
通讯作者	Li, Xuesong; Low, Tony; Shi, Yi; Wang, Xiaomu
作者单位	1.Nanjing Univ, Sch Elect Sci & Engn, Nanjing, Peoples R China 2.Univ Elect Sci & Technol China, Sch Elect Sci & Engn, Chengdu, Peoples R China 3.Beijing Computat Sci Res Ctr, Beijing, Peoples R China 4.Univ Minnesota, Dept Elect & Comp Engn, Minneapolis, MN 55455 USA 5.Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang, Peoples R China 6.Univ Elect Sci & Technol China, Shenzhen Inst Adv Study, Shenzhen, Peoples R China 7.Univ Minnesota, Dept Phys, Minneapolis, MN 55455 USA
推荐引用方式 GB/T 7714	Huang, Tianye,Tu, Xuecou,Shen, Changqing,et al. Observation of chiral and slow plasmons in twisted bilayer graphene[J]. NATURE,2022,605(7908):63-+.
APA	Huang, Tianye.,Tu, Xuecou.,Shen, Changqing.,Zheng, Binjie.,Wang, Junzhuan.,...&Wang, Xiaomu.(2022).Observation of chiral and slow plasmons in twisted bilayer graphene.NATURE,605(7908),63-+.
MLA	Huang, Tianye,et al."Observation of chiral and slow plasmons in twisted bilayer graphene".NATURE 605.7908(2022):63-+.