Real-space study of zero-field correlation in tetralayer rhombohedral graphene
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866913602919727104 |
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| author | Liu, Yufeng Li, Zonglin Jiang, Shudan Li, Min Gu, Yu Liu, Kai Shen, Qia Liu, Liang Liu, Xiaoxue Guan, Dandan Li, Yaoyi Zheng, Hao Liu, Canhua Watanabe, Kenji Taniguchi, Takashi Jia, Jinfeng Li, Tingxin Chen, Guorui Liu, Jianpeng Li, Can Shi, Zhiwen Wang, Shiyong |
| author_facet | Liu, Yufeng Li, Zonglin Jiang, Shudan Li, Min Gu, Yu Liu, Kai Shen, Qia Liu, Liang Liu, Xiaoxue Guan, Dandan Li, Yaoyi Zheng, Hao Liu, Canhua Watanabe, Kenji Taniguchi, Takashi Jia, Jinfeng Li, Tingxin Chen, Guorui Liu, Jianpeng Li, Can Shi, Zhiwen Wang, Shiyong |
| contents | Rhombohedral graphene (RG) has emerged as a promising platform for exploring exotic quantum phenomena, such as quantum magnetism, unconventional superconductivity, and fractional quantum anomalous Hall effects. Despite its potential, atomic-scale investigations of RG remain limited, hindering a detailed microscopic understanding of the origins of these correlated states. In this study, we employ scanning probe microscopy and spectroscopy to probe the intrinsic electronic states in trilayer and tetralayer RG. We identify a correlated insulating state with a 17 meV gap at the charge neutrality point in tetralayer RG, which is absent in the trilayer configuration. This gap is suppressed by applying a perpendicular magnetic field or doping the charge carrier density and does not exhibit inter-valley coherence patterns. We attribute this phenomenon to a symmetry-broken layer antiferromagnetic state, characterized by ferrimagnetic ordering in the outermost layers and antiferromagnetic coupling between them. To further investigate this magnetic correlated state, we conduct local scattering experiments. Within the correlated regime, a bound state emerges around a non-magnetic impurity but is absent near magnetic impurities, suggesting that non-magnetic doping induces a spin texture in the ferrimagnetic surface layers. Outside the correlated regime, Friedel oscillations are observed, allowing precise determination of the band dispersion in tetralayer RG. These findings provide atomic-scale evidences of zero-field correlations in RG and may be extended to study other exotic phases in RG. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2412_06476 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Real-space study of zero-field correlation in tetralayer rhombohedral graphene Liu, Yufeng Li, Zonglin Jiang, Shudan Li, Min Gu, Yu Liu, Kai Shen, Qia Liu, Liang Liu, Xiaoxue Guan, Dandan Li, Yaoyi Zheng, Hao Liu, Canhua Watanabe, Kenji Taniguchi, Takashi Jia, Jinfeng Li, Tingxin Chen, Guorui Liu, Jianpeng Li, Can Shi, Zhiwen Wang, Shiyong Mesoscale and Nanoscale Physics Materials Science Rhombohedral graphene (RG) has emerged as a promising platform for exploring exotic quantum phenomena, such as quantum magnetism, unconventional superconductivity, and fractional quantum anomalous Hall effects. Despite its potential, atomic-scale investigations of RG remain limited, hindering a detailed microscopic understanding of the origins of these correlated states. In this study, we employ scanning probe microscopy and spectroscopy to probe the intrinsic electronic states in trilayer and tetralayer RG. We identify a correlated insulating state with a 17 meV gap at the charge neutrality point in tetralayer RG, which is absent in the trilayer configuration. This gap is suppressed by applying a perpendicular magnetic field or doping the charge carrier density and does not exhibit inter-valley coherence patterns. We attribute this phenomenon to a symmetry-broken layer antiferromagnetic state, characterized by ferrimagnetic ordering in the outermost layers and antiferromagnetic coupling between them. To further investigate this magnetic correlated state, we conduct local scattering experiments. Within the correlated regime, a bound state emerges around a non-magnetic impurity but is absent near magnetic impurities, suggesting that non-magnetic doping induces a spin texture in the ferrimagnetic surface layers. Outside the correlated regime, Friedel oscillations are observed, allowing precise determination of the band dispersion in tetralayer RG. These findings provide atomic-scale evidences of zero-field correlations in RG and may be extended to study other exotic phases in RG. |
| title | Real-space study of zero-field correlation in tetralayer rhombohedral graphene |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2412.06476 |