Spin-Polarized Nematic Order, Quantum Valley Hall States, and Field-Tunable Topological Transitions in Twisted Multilayer Graphene Systems

doi:10.1103/PhysRevLett.128.026403

	Spin-Polarized Nematic Order, Quantum Valley Hall States, and Field-Tunable Topological Transitions in Twisted Multilayer Graphene Systems
	Zhang, Shihao1 ; Dai, Xi 2; Liu, Jianpeng1,3
	2022-01-14
发表期刊	PHYSICAL REVIEW LETTERS (IF:8.1[JCR-2023],8.3[5-Year])
ISSN	0031-9007
EISSN	1079-7114
卷号	128 期号:2
发表状态	已发表
DOI	10.1103/PhysRevLett.128.026403
摘要	We theoretically study the correlated insulator states, quantum anomalous Hall (QAH) states, and fieldinduced topological transitions between different correlated states in twisted multilayer graphene systems. Taking twisted bilayer-monolayer graphene and twisted double-bilayer graphene as examples, we show that both systems stay in spin-polarized, C3z-broken insulator states with zero Chern number at 1/2 filling of the flat bands under finite displacement fields. In some cases these spin-polarized, nematic insulator states are in the quantum valley Hall (QVH) phase by virtue of the nontrivial band topology of the systems. The spin-polarized insulator state is quasidegenerate with the valley polarized state if only the dominant intravalley Coulomb interaction is included. Such quasidegeneracy can be split by atomic on-site interactions such that the spin-polarized, nematic state become the unique ground state. Such a scenario applies to various twisted multilayer graphene systems at 1/2 filling, thus can be considered as a universal mechanism. Moreover, under vertical magnetic fields, the orbital Zeeman splittings and the field-induced change of charge density in twisted multilayer graphene systems would compete with the atomic Hubbard interactions, which can drive transitions from spin-polarized zero-Chern-number states to valley-polarized QAH states with small onset magnetic fields.
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收录类别	SCI ; EI ; SCIE
语种	英语
资助项目	National Key R & D program of China[2020YFA0309601]
WOS研究方向	Physics
WOS类目	Physics, Multidisciplinary
WOS记录号	WOS:000744117100012
出版者	AMER PHYSICAL SOC
引用统计	正在获取...
文献类型	期刊论文
条目标识符	https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/153551
专题	物质科学与技术学院_PI研究组_刘健鹏组
通讯作者	Liu, Jianpeng
作者单位	1.ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 200031, Peoples R China 2.Hong Kong Univ Sci & Technol, Dept Phys, Hong Kong, Peoples R China 3.ShanghaiTech Univ, ShanghaiTech Lab Topol Phys, Shanghai 200031, Peoples R China
第一作者单位	物质科学与技术学院
通讯作者单位	物质科学与技术学院; 上海科技大学
第一作者的第一单位	物质科学与技术学院
推荐引用方式 GB/T 7714	Zhang, Shihao,Dai, Xi,Liu, Jianpeng. Spin-Polarized Nematic Order, Quantum Valley Hall States, and Field-Tunable Topological Transitions in Twisted Multilayer Graphene Systems[J]. PHYSICAL REVIEW LETTERS,2022,128(2).
APA	Zhang, Shihao,Dai, Xi,&Liu, Jianpeng.(2022).Spin-Polarized Nematic Order, Quantum Valley Hall States, and Field-Tunable Topological Transitions in Twisted Multilayer Graphene Systems.PHYSICAL REVIEW LETTERS,128(2).
MLA	Zhang, Shihao,et al."Spin-Polarized Nematic Order, Quantum Valley Hall States, and Field-Tunable Topological Transitions in Twisted Multilayer Graphene Systems".PHYSICAL REVIEW LETTERS 128.2(2022).