Evolution of flat band and role of lattice relaxations in twisted bilayer graphene
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arXiv
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2024
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| author | Li, Qian Zhang, Hongyun Wang, Yijie Chen, Wanying Bao, Changhua Liu, Qinxin Lin, Tianyun Zhang, Shuai Zhang, Haoxiong Watanabe, Kenji Taniguchi, Takashi Avila, Jose Dudin, Pavel Li, Qunyang Yu, Pu Duan, Wenhui Song, Zhida Zhou, Shuyun |
| author_facet | Li, Qian Zhang, Hongyun Wang, Yijie Chen, Wanying Bao, Changhua Liu, Qinxin Lin, Tianyun Zhang, Shuai Zhang, Haoxiong Watanabe, Kenji Taniguchi, Takashi Avila, Jose Dudin, Pavel Li, Qunyang Yu, Pu Duan, Wenhui Song, Zhida Zhou, Shuyun |
| contents | Magic-angle twisted bilayer graphene (MATBG) exhibits correlated phenomena such as superconductivity and Mott insulating state related to the weakly dispersing flat band near the Fermi energy. Beyond its moiré period, such flat band is expected to be sensitive to lattice relaxations. Thus, clarifying the evolution of the electronic structure with twist angle is critical for understanding the physics of MATBG. Here, we combine nanospot angle-resolved photoemission spectroscopy and atomic force microscopy to resolve the fine electronic structure of the flat band and remote bands, and their evolution with twist angles from 1.07$^\circ$ to 2.60$^\circ$. Near the magic angle, dispersion is characterized by a flat band near the Fermi energy with a strongly reduced bandwidth. Moreover, near 1.07$^\circ$, we observe a spectral weight transfer between remote bands at higher binding energy and extract the modulated interlayer spacing near the magic angle. Our work provides direct spectroscopic information on flat band physics and highlights the role of lattice relaxations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_14078 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Evolution of flat band and role of lattice relaxations in twisted bilayer graphene Li, Qian Zhang, Hongyun Wang, Yijie Chen, Wanying Bao, Changhua Liu, Qinxin Lin, Tianyun Zhang, Shuai Zhang, Haoxiong Watanabe, Kenji Taniguchi, Takashi Avila, Jose Dudin, Pavel Li, Qunyang Yu, Pu Duan, Wenhui Song, Zhida Zhou, Shuyun Mesoscale and Nanoscale Physics Materials Science Magic-angle twisted bilayer graphene (MATBG) exhibits correlated phenomena such as superconductivity and Mott insulating state related to the weakly dispersing flat band near the Fermi energy. Beyond its moiré period, such flat band is expected to be sensitive to lattice relaxations. Thus, clarifying the evolution of the electronic structure with twist angle is critical for understanding the physics of MATBG. Here, we combine nanospot angle-resolved photoemission spectroscopy and atomic force microscopy to resolve the fine electronic structure of the flat band and remote bands, and their evolution with twist angles from 1.07$^\circ$ to 2.60$^\circ$. Near the magic angle, dispersion is characterized by a flat band near the Fermi energy with a strongly reduced bandwidth. Moreover, near 1.07$^\circ$, we observe a spectral weight transfer between remote bands at higher binding energy and extract the modulated interlayer spacing near the magic angle. Our work provides direct spectroscopic information on flat band physics and highlights the role of lattice relaxations. |
| title | Evolution of flat band and role of lattice relaxations in twisted bilayer graphene |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2403.14078 |