Magic angles and flat Chern bands in alternating-twist multilayer graphene system

作     者：Zhiyong Liu Wenyuan Shi Teng Yang Zhidong Zhang Zhiyong Liu;Wenyuan Shi;Teng Yang;Zhidong Zhang

作者机构：Shenyang National Laboratory for Materials ScienceInstitute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and EngineeringUniversity of Science and Technology of ChinaShenyang 110016China Western Reserve Academy115 College Street HudsonOhio 44236United States 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2022年第111卷第16期

页      面：28-34页

核心收录：

学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 0804[工学-仪器科学与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0701[理学-数学] 0702[理学-物理学] 

基　　金：financially supported by the National Natural Science Foundation of China(No.52031014) the Ministry of Science and Technology of China(No.2017YFA0206301) Liaoning Provincial Natural Science Fund(No.2021-MS-006) 

主　　题：Alternating-twist multilayer graphene Magic angle Flat band Band topology 

摘      要：Based on the effective continuum model,we study alternating-twist multilayer graphene system and emergence of magic angles and flat band *** the alternating-twist multilayer graphene system(from triple layers to few layers)are found to have flat bands at magic angles where the area of AA stacking equals n-fold(n is an integer)electron cyclotron *** the pseudo-Landau-level representation,there is always an isolated Dirac band in the alternating-twist graphene system constructed by odd number of *** each pair of flat bands can be perceived as the zeroth pseudo-Landau-levels in two dimensional Dirac fermions,electron in the flat band pair can feel a pseudo-magnetic field with the same magnitude but the opposite *** Chern number for each flat band is+1(or-1)which can be tuned by twisting in the vicinity of magic angles or by *** concurrent appearance of strong correlation and band topology of flat bands in the alternating-twist multilayer graphene may pave an avenue for the new understanding of superconductivity observed in triple-layered graphene,and supply a new playground for realizing(quantum)anomalous Hall effect.