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DOI	10.1016/j.scib.2020.10.004
	Topological flat bands in twisted trilayer graphene
	Ma Z.; Li S.; Zheng Y.-W.; Xiao M.-M.; Jiang H.; Gao J.-H.; Xie X.C.
发表日期	2021
ISSN	20959273
起始页码	18
结束页码	22
卷号	66 期号:1
英文摘要	Twisted trilayer graphene (TLG) may be the simplest realistic system so far, which has flat bands with nontrivial topology. Here, we give a comprehensive calculation about its band structures and the band topology, i.e., valley Chern number of the nearly flat bands, with the continuum model. With realistic parameters, the magic angle of twisted TLG is about 1.12°, at which two nearly flat bands appears. Unlike the twisted bilayer graphene, a small twist angle can induce a tiny gap at all the Dirac points, which can be enlarged further by a perpendicular electric field. The valley Chern numbers of the two nearly flat bands in the twisted TLG depends on the twist angle θ and the perpendicular electric field E⊥. Considering its topological flat bands, the twisted TLG should be an ideal experimental platform to study the strongly correlated physics in topologically nontrivial flat band systems. And, due to its reduced symmetry, the correlated states in twisted TLG should be quite different from that in twisted bilayer graphene and twisted double bilayer graphene. © 2020 Science China Press
关键词	Moiré heterostructure Topological flat bands Twisted trilayer graphene Valley Chern number
英文关键词	Continuum mechanics; Electric fields; Graphene; Bilayer Graphene; Chern numbers; Continuum Modeling; Experimental platform; Nontrivial topology; Realistic systems; Twist angles; Twisted bilayers; Topology
语种	英语
来源期刊	Science Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207522
作者单位	School of Physics and Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan, 430074, China; School of Physical Science and Technology, Soochow University, Suzhou, 215006, China; International Center for Quantum Materials, School of Physics, Peking University, Beijing, 100871, China; Collaborative Innovation Center of Quantum Matter, Beijing, 100871, China; CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing, 100190, China
推荐引用方式 GB/T 7714	Ma Z.,Li S.,Zheng Y.-W.,et al. Topological flat bands in twisted trilayer graphene[J],2021,66(1).
APA	Ma Z..,Li S..,Zheng Y.-W..,Xiao M.-M..,Jiang H..,...&Xie X.C..(2021).Topological flat bands in twisted trilayer graphene.Science Bulletin,66(1).
MLA	Ma Z.,et al."Topological flat bands in twisted trilayer graphene".Science Bulletin 66.1(2021).