Valley landau level crossings in weakly coupled bilayer WSe2
文献类型：期刊论文
| 作者 | Li, Shiwei3; Cao, Xinyu3; Zhang, Qi3; Huang, Yan3; Kuang, Guangli4 ; Xi, Chuanying4; Watanabe, Kenji5; Taniguchi, Takashi2; Yu, Geliang1,3; Wang, Lei1,3
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| 刊名 | 2D MATERIALS
 |
| 出版日期 | 2024-10-01 |
| 卷号 | 11 |
| 关键词 | bilayer WSe2 weak coupling Landau level crossing |
| ISSN号 | 2053-1583 |
| DOI | 10.1088/2053-1583/ad6b80 |
| 通讯作者 | Yu, Geliang(yugeliang@nju.edu.cn) ; Wang, Lei(leiwang@nju.edu.cn) |
| 英文摘要 | WSe2 is a p-type 2D-semiconductor that can be mechanically exfoliated down to atomic layers. Unlike the Bernal stacked bilayer graphene, the two layers in a bilayer WSe2 flake are weakly coupled. The electric displacement field can easily break the layer degeneracy of the bilayer WSe2. Together with the strong spin-orbit coupling, it exhibits many novel quantum physical properties. In this work, we fabricate high quality dual-gated bilayer WSe2 devices and observe twofold degenerate Landau levels(LLs) and density-dependent quantum Hall states which show transitions between even and odd filling. When introducing carriers into the system from the valence band edge by gating, two WSe2 layers are filled independently and the bottom layer WSe2 shows negative compressibility at the crossover point. Above 9 T, we observe the degeneracy of LLs is completely broken and there are two sets of LL crossings in the top WSe2 layer at Zeeman-to-cyclotron energy ratio E-Z/E-N approximate to 4 and E-Z/E-N approximate to 5. The interplay between two LLs from the two WSe2 layers confirms the weak coupling between them. Our results show that the bilayer WSe2 behave like two closely packed independent electronic systems under electric displacement fields. |
| WOS关键词 | 2-DIMENSIONAL ELECTRON ; TRANSITION ; SPIN ; LAYER |
| 资助项目 | JSPS KAKENHI ; National Key Projects for Research and Development of China[2021YFA1400400] ; National Key Projects for Research and Development of China[2022YFA1204700] ; National Natural Science Foundation of China[12074173] ; Natural Science Foundation of Jiangsu Province[BK20220066] ; World Premier International Research Center Initiative (WPI), MEXT, Japan ; [21H05233] ; [23H02052] |
| WOS研究方向 | Materials Science |
| 语种 | 英语 |
| WOS记录号 | WOS:001291519000001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | JSPS KAKENHI ; National Key Projects for Research and Development of China ; National Natural Science Foundation of China ; Natural Science Foundation of Jiangsu Province ; World Premier International Research Center Initiative (WPI), MEXT, Japan |
| 源URL | [http://ir.hfcas.ac.cn:8080/handle/334002/135985]  |
| 专题 | 中国科学院合肥物质科学研究院 |
| 通讯作者 | Yu, Geliang; Wang, Lei |
| 作者单位 | 1.Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Peoples R China 2.Natl Inst Mat Sci, Res Ctr Mat Nanoarchitec, Namiki 1-1, Tsukuba, Ibaraki 3050044, Japan 3.Nanjing Univ, Sch Phys, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China 4.Chinese Acad Sci, Anhui Prov Key Lab Condensed Matter Phys Extreme C, High Magnet Field Lab, Hefei 230031, Peoples R China 5.Natl Inst Mat Sci, Res Ctr Elect & Opt Mat, Namiki 1-1, Tsukuba, Ibaraki 3050044, Japan |
| 推荐引用方式 GB/T 7714 | Li, Shiwei,Cao, Xinyu,Zhang, Qi,et al. Valley landau level crossings in weakly coupled bilayer WSe2[J]. 2D MATERIALS,2024,11. |
| APA | Li, Shiwei.,Cao, Xinyu.,Zhang, Qi.,Huang, Yan.,Kuang, Guangli.,...&Wang, Lei.(2024).Valley landau level crossings in weakly coupled bilayer WSe2.2D MATERIALS,11. |
| MLA | Li, Shiwei,et al."Valley landau level crossings in weakly coupled bilayer WSe2".2D MATERIALS 11(2024). |
入库方式： OAI收割
来源：合肥物质科学研究院
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