Magnetic Bloch States at Integer Flux Quanta Induced by Super-moiré Potential in Graphene Aligned with Twisted Boron Nitride
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866912241246273536 |
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| author | Ma, Yaqi Huang, Meizhen Zhang, Xu Hu, Weixiong Zhou, Zishu Feng, Kai Li, Wenhui Chen, Yong Lou, Chenxuan Zhang, Weikang Ji, Haoxi Wang, Yibo Wu, Zefei Cui, Xiaodong Yao, Wang Yan, Shichao Meng, Zi Yang Wang, Ning |
| author_facet | Ma, Yaqi Huang, Meizhen Zhang, Xu Hu, Weixiong Zhou, Zishu Feng, Kai Li, Wenhui Chen, Yong Lou, Chenxuan Zhang, Weikang Ji, Haoxi Wang, Yibo Wu, Zefei Cui, Xiaodong Yao, Wang Yan, Shichao Meng, Zi Yang Wang, Ning |
| contents | Two-dimensional electron systems in both magnetic fields and periodic potentials are described by Hofstadter butterfly, a fundamental problem of solid-state physics. While moiré systems provide a powerful method to realize this spectrum, previous experiments, however, have been limited to fractional flux quanta regime due to the difficulty of building ~ 50 nm periodic modulations. Here, we demonstrate a super-moiré strategy to overcome this challenge. By aligning monolayer graphene (G) with 1.0° twisted hexagonal boron nitride (t-hBN), a 63.2 nm bichromatic G/t-hBN super-moiré is constructed, made possible by exploiting the electrostatic nature of t-hBN potential. Under magnetic field B, magnetic Bloch states at integer flux quanta (1-9) are achieved and observed as integer Brown-Zak oscillations, expanding the flux quanta from factions to integers. Theoretical analysis reproduces these experimental findings. This work opens new avenues to study unexplored Hofstadter butterfly, explore emergent topological order at integer flux quanta and engineer long-wavelength periodic modulations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_07283 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Magnetic Bloch States at Integer Flux Quanta Induced by Super-moiré Potential in Graphene Aligned with Twisted Boron Nitride Ma, Yaqi Huang, Meizhen Zhang, Xu Hu, Weixiong Zhou, Zishu Feng, Kai Li, Wenhui Chen, Yong Lou, Chenxuan Zhang, Weikang Ji, Haoxi Wang, Yibo Wu, Zefei Cui, Xiaodong Yao, Wang Yan, Shichao Meng, Zi Yang Wang, Ning Mesoscale and Nanoscale Physics Two-dimensional electron systems in both magnetic fields and periodic potentials are described by Hofstadter butterfly, a fundamental problem of solid-state physics. While moiré systems provide a powerful method to realize this spectrum, previous experiments, however, have been limited to fractional flux quanta regime due to the difficulty of building ~ 50 nm periodic modulations. Here, we demonstrate a super-moiré strategy to overcome this challenge. By aligning monolayer graphene (G) with 1.0° twisted hexagonal boron nitride (t-hBN), a 63.2 nm bichromatic G/t-hBN super-moiré is constructed, made possible by exploiting the electrostatic nature of t-hBN potential. Under magnetic field B, magnetic Bloch states at integer flux quanta (1-9) are achieved and observed as integer Brown-Zak oscillations, expanding the flux quanta from factions to integers. Theoretical analysis reproduces these experimental findings. This work opens new avenues to study unexplored Hofstadter butterfly, explore emergent topological order at integer flux quanta and engineer long-wavelength periodic modulations. |
| title | Magnetic Bloch States at Integer Flux Quanta Induced by Super-moiré Potential in Graphene Aligned with Twisted Boron Nitride |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2502.07283 |