globalchange  > 气候变化与战略
DOI: 10.1016/j.scib.2020.10.004
论文题名:
Topological flat bands in twisted trilayer graphene
作者: Ma Z.; Li S.; Zheng Y.-W.; Xiao M.-M.; Jiang H.; Gao J.-H.; Xie X.C.
刊名: Science Bulletin
ISSN: 20959273
出版年: 2021
卷: 66, 期:1
起始页码: 18
结束页码: 22
语种: 英语
中文关键词: 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
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
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被引频次[WOS]:42   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170356
Appears in Collections:气候变化与战略

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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

Recommended Citation:
Ma Z.,Li S.,Zheng Y.-W.,et al. Topological flat bands in twisted trilayer graphene[J]. Science Bulletin,2021-01-01,66(1)
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