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| Probing band topology in ABAB and ABBA stacked twisted double bilayer graphene | |
| 2024-09-17 | |
| 状态 | 已发表 |
| 摘要 | Twisted graphene moiré superlattice has been demonstrated as an exotic platform for investigating correlated states and nontrivial topology. Among the moiré family, twisted double bilayer graphene (TDBG) is a tunable flat band system expected to show stacking-dependent topological properties. However, electron correlations and the band topology are usually intertwined in the flat band limit, rendering the unique topological property due to stacking still elusive. Focusing on a large-angle TDBG with weak electron correlations, here we probe the Landau level (LL) spectra in two differently stacked TDBG, i.e. ABBA- and ABAB-TDBG, to unveil their distinct topological properties. For ABBA-TDBG, we observe non-trivial topology at zero electric displacement filed D = 0, evident from both the emergence of Chern bands from half fillings v = ±2 and the closure of gap at CNP above a critical magnetic field. For ABAB-TDBG, by contrast, we find that the moiré band is topologically trivial at D = 0, supported by the absence of LLs from half fillings and the persistence of the gap at CNP above the critical magnetic fields. In addition, we also observe an evolution of the trivial-to-nontrivial topological transition at D â 0, confirmed by the emerged Landau fans originating from quarter filling v = 1. Our result demonstrates, for the first time, the unique stacking-dependent topology in TDBG, offering a promising avenue for future investigations on topological states in correlated systems. |
| 语种 | 英语 |
| DOI | arXiv:2409.11023 |
| 相关网址 | 查看原文 |
| 出处 | Arxiv |
| 收录类别 | PPRN.PPRN |
| WOS记录号 | PPRN:91941707 |
| WOS类目 | Physics, Condensed Matter |
| 文献类型 | 预印本 |
| 条目标识符 | https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/430450 |
| 专题 | 物质科学与技术学院 物质科学与技术学院_PI研究组_刘健鹏组 |
| 通讯作者 | Yang, Wei; Zhang, Guangyu |
| 作者单位 | 1.Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China 2.Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China 3.Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100190, Peoples R China 4.Songshan Lake Mat Lab, Dongguan 523808, Peoples R China 5.Natl Inst Mat Sci, Res Ctr Funct Mat, 1-1 Namiki, Tsukuba 3050044, Japan 6.Natl Inst Mat Sci, Int Ctr Mat Nanoarchitecton, 1-1 Namiki, Tsukuba 3050044, Japan 7.ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 200031, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhu, Jundong,Liu, Le,Yuan, Yalong,et al. Probing band topology in ABAB and ABBA stacked twisted double bilayer graphene. 2024. |
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