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Experimental evidence for orbital magnetic moments generated by moire-scale current loops in twisted bilayer graphene | |
2020-09-18 | |
发表期刊 | PHYSICAL REVIEW B (IF:3.2[JCR-2023],3.3[5-Year]) |
ISSN | 2469-9950 |
卷号 | 102期号:12 |
DOI | 10.1103/PhysRevB.102.121406 |
摘要 | Electron-electron (e-e) interactions in the twisted bilayer graphene (TBG) near the magic angle similar to 1.1 degrees can lift the valley degeneracy, allowing for the realization of orbital magnetism and topological phases. However, direct measurement of the orbital-based magnetism in the TBG is still lacking up to now. Here we report evidence for orbital magnetic moment generated by the moire-scale current loops in a TBG with a twist angle theta similar to 1.68 degrees. The valley degeneracy of the 1.68 degrees TBG is removed by e-e interactions when its low-energy Van Hove singularity (VHS) is nearly half filled. A large and linear response of the valley splitting to magnetic fields is observed, which we interpret as arising from the coupling to the large orbital magnetic moment induced by chiral current loops circulating in the moire pattern. According to our experiment, the orbital magnetic moment is about 10.7 mu(B) per moire supercell. Our result paves the way to explore magnetism that is purely orbital in a slightly twisted graphene system. |
收录类别 | SCI ; SCIE ; EI |
语种 | 英语 |
资助项目 | National Natural Science Foundation of China[11974050][11674029] |
WOS研究方向 | Materials Science ; Physics |
WOS类目 | Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter |
WOS记录号 | WOS:000570979200001 |
出版者 | AMER PHYSICAL SOC |
引用统计 | 正在获取...
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文献类型 | 期刊论文 |
条目标识符 | https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/123552 |
专题 | 物质科学与技术学院 物质科学与技术学院_PI研究组_刘健鹏组 |
通讯作者 | Liu, Jianpeng; He, Lin |
作者单位 | 1.Hunan Univ, Coll Mat Sci & Engn, Key Lab Micronano Phys & Technol Hunan Prov, Changsha 410082, Hunan, Peoples R China; 2.Beijing Normal Univ, Ctr Adv Quantum Studies, Dept Phys, Beijing 100875, Peoples R China; 3.ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 200031, Peoples R China; 4.Hong Kong Univ Sci & Technol, Dept Phys, Kowloon, Hong Kong, Peoples R China |
通讯作者单位 | 物质科学与技术学院 |
推荐引用方式 GB/T 7714 | Li, Si-Yu,Zhang, Yu,Ren, Ya-Ning,et al. Experimental evidence for orbital magnetic moments generated by moire-scale current loops in twisted bilayer graphene[J]. PHYSICAL REVIEW B,2020,102(12). |
APA | Li, Si-Yu,Zhang, Yu,Ren, Ya-Ning,Liu, Jianpeng,Dai, Xi,&He, Lin.(2020).Experimental evidence for orbital magnetic moments generated by moire-scale current loops in twisted bilayer graphene.PHYSICAL REVIEW B,102(12). |
MLA | Li, Si-Yu,et al."Experimental evidence for orbital magnetic moments generated by moire-scale current loops in twisted bilayer graphene".PHYSICAL REVIEW B 102.12(2020). |
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