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Observation of chiral and slow plasmons in twisted bilayer graphene

文献类型：期刊论文

作者Huang, Tianye7; Tu, Xuecou7; Shen, Changqing6; Zheng, Binjie7; Wang, Junzhuan7; Wang, Hao5; Khaliji, Kaveh4; Park, Sang Hyun4; Liu, Zhiyong3; Yang, Teng3
刊名NATURE
出版日期2022-05-05
卷号605期号:7908页码:63-+
ISSN号0028-0836
DOI10.1038/s41586-022-04520-8
通讯作者Li, Xuesong() ; Low, Tony() ; Shi, Yi() ; Wang, Xiaomu()
英文摘要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
语种英语
WOS记录号WOS:000790960500015
出版者NATURE PORTFOLIO
资助机构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)
源URL[http://ir.imr.ac.cn/handle/321006/173956]  
专题金属研究所_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.Univ Minnesota, Dept Phys, Minneapolis, MN 55455 USA
2.Univ Elect Sci & Technol China, Shenzhen Inst Adv Study, Shenzhen, Peoples R China
3.Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang, Peoples R China
4.Univ Minnesota, Dept Elect & Comp Engn, Minneapolis, MN 55455 USA
5.Beijing Computat Sci Res Ctr, Beijing, Peoples R China
6.Univ Elect Sci & Technol China, Sch Elect Sci & Engn, Chengdu, Peoples R China
7.Nanjing Univ, Sch Elect Sci & Engn, Nanjing, Peoples R China
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-+.

入库方式： OAI收割

来源：金属研究所

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