| Origin of the magic angle in twisted bilayer graphene from hybridization of valence and conduction bands | |
| Yu, Guodong1; Wang, Yunhua2,3; Katsnelson, Mikhail I.4; Yuan, Shengjun3,4 | |
| 2023-07-15 | |
| Source Publication | PHYSICAL REVIEW B Impact Factor & Quartile |
| ISSN | 2469-9950 |
| Volume | 108Issue:4 |
| page numbers | 8 |
| Abstract | The magic-angle phenomenon of twisted bilayer graphene (tBG), i.e, the nontrivial topological flat bands with vanishing Fermi velocity at half filling, has aroused prominent attention on superconductivity, correlated insulators, orbital magnetism, etc. Several efforts have been made to unravel the generation mechanism of the magic-angle phenomenon in tBG. Herein, we show that the hybridizations between the conduction band (CB) and valence band (VB) from different monolayers are critically responsible for the flat bands with band inversion as a signature of the magic-angle phenomenon. The proposed new mechanism for the magic-angle phenomenon is verified by the reversion of irreducible representations of energy bands at Γ point. We also discuss the effects of VB-VB and CB-CB hybridizations on the band structures of tBG. The tight-binding results indicate that the VB-VB and CB-CB hybridizations from different layers play the role of the moiré potential in real space and reduce the bandwidth in the framework of nearly-free electron model. Our conclusions can also give the explanation on the absence of the magic-angle phenomenon even with bandwidth reductions in twisted bilayer MoS2 and BN. © 2023 American Physical Society. |
| Keyword | Bandwidth Electrons Graphene Layered semiconductors Molybdenum compounds Band conduction Bilayer Graphene Fermi velocities Flat band Generation mechanism Half-filling Hybridisation Magic angle Orbital magnetism Twisted bilayers |
| Publisher | American Physical Society |
| DOI | 10.1103/PhysRevB.108.045138 |
| Indexed By | EI ; SCIE |
| Language | 英语 |
| WOS Research Area | Materials Science ; Physics |
| WOS Subject | Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter |
| WOS ID | WOS:001064088900004 |
| EI Accession Number | 20233214505151 |
| EI Keywords | Conduction bands |
| EI Classification Number | 712.1 Semiconducting Materials ; 716.1 Information Theory and Signal Processing ; 761 Nanotechnology ; 804 Chemical Products Generally ; 932.1 High Energy Physics |
| Original Document Type | Journal article (JA) |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | https://ir.lzu.edu.cn/handle/262010/532080 |
| Collection | 兰州大学 |
| Corresponding Author | Wang, Yunhua |
| Affiliation | 1.Center for Quantum Sciences, School of Physics, Northeast Normal University, Changchun; 130024, China; 2.Lanzhou Center of Theoretical Physics, Key Laboratory for Quantum Theory and Applications of the Ministry of Education, Key Laboratory of Theoretical Physics of Gansu Province, School of Physical Science and Technology, Lanzhou University, Lanzhou; 730000, China; 3.Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan; 430072, China; 4.Institute for Molecules and Materials, Radboud University, Heijendaalseweg 135, Nijmegen; NL-6525 AJ, Netherlands |
| Corresponding Author Affilication | Lanzhou University |
| Recommended Citation GB/T 7714 | Yu, Guodong,Wang, Yunhua,Katsnelson, Mikhail I.,et al. Origin of the magic angle in twisted bilayer graphene from hybridization of valence and conduction bands[J]. PHYSICAL REVIEW B,2023,108(4). |
| APA | Yu, Guodong,Wang, Yunhua,Katsnelson, Mikhail I.,&Yuan, Shengjun.(2023).Origin of the magic angle in twisted bilayer graphene from hybridization of valence and conduction bands.PHYSICAL REVIEW B,108(4). |
| MLA | Yu, Guodong,et al."Origin of the magic angle in twisted bilayer graphene from hybridization of valence and conduction bands".PHYSICAL REVIEW B 108.4(2023). |
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