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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2509.08701 |
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| _version_ | 1866912580658790400 |
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| author | Li, Yuanze Chen, Jiahao Wang, Renfei Zhang, Yifan Deng, Yingdong Xie, Jin Kou, Xufeng Liu, Yang Liang, Tian |
| author_facet | Li, Yuanze Chen, Jiahao Wang, Renfei Zhang, Yifan Deng, Yingdong Xie, Jin Kou, Xufeng Liu, Yang Liang, Tian |
| contents | We report the first experimental observation of magnetic-field-induced quantized charge accumulation in a quantum anomalous Hall (QAH) system -- a phenomenon originating from the intrinsic two-dimensional surface state and fundamentally distinct from conventional edge-dependent transport phenomena. Our approach employs a novel out-of-plane capacitive detection method to directly probe this charge accumulation, revealing its distinction and correlation with other surface state properties, such as Laughlin charge pumping. We demonstrate that the accumulated charge density is governed by the quantized Hall conductance but is significantly influenced by dissipation effects due to finite longitudinal conductance. By performing frequency and longitudinal conductance dependence measurements, the underlying ideal quantized charge accumulation is extracted, in agreement with theoretical predictions. Importantly, our out-of-plane method of measuring charge accumulation allows the detection of small electric polarization in future studies, establishing a pathway toward the direct observation of the topological magnetoelectric effect, a manifestation of the four-dimensional quantum Hall effect. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_08701 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Quantized Charge Accumulation in a Quantum Anomalous Hall System Li, Yuanze Chen, Jiahao Wang, Renfei Zhang, Yifan Deng, Yingdong Xie, Jin Kou, Xufeng Liu, Yang Liang, Tian Mesoscale and Nanoscale Physics We report the first experimental observation of magnetic-field-induced quantized charge accumulation in a quantum anomalous Hall (QAH) system -- a phenomenon originating from the intrinsic two-dimensional surface state and fundamentally distinct from conventional edge-dependent transport phenomena. Our approach employs a novel out-of-plane capacitive detection method to directly probe this charge accumulation, revealing its distinction and correlation with other surface state properties, such as Laughlin charge pumping. We demonstrate that the accumulated charge density is governed by the quantized Hall conductance but is significantly influenced by dissipation effects due to finite longitudinal conductance. By performing frequency and longitudinal conductance dependence measurements, the underlying ideal quantized charge accumulation is extracted, in agreement with theoretical predictions. Importantly, our out-of-plane method of measuring charge accumulation allows the detection of small electric polarization in future studies, establishing a pathway toward the direct observation of the topological magnetoelectric effect, a manifestation of the four-dimensional quantum Hall effect. |
| title | Quantized Charge Accumulation in a Quantum Anomalous Hall System |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2509.08701 |