Strongly enhanced topological quantum phases in dual-surface AlO$_x$-encapsulated MnBi$_2$Te$_4$
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arXiv
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| Format: | Preprint |
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2025
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| author | Lian, Zichen Wang, Yongqian Wang, Yongchao Xu, Liangcai Zhang, Jinsong Liu, Chang Wang, Yayu |
| author_facet | Lian, Zichen Wang, Yongqian Wang, Yongchao Xu, Liangcai Zhang, Jinsong Liu, Chang Wang, Yayu |
| contents | The topological quantum phases in antiferromagnetic topological insulator MnBi$_2$Te$_4$ hold promise for next-generation spintronics, but their experimental realization has been constrained by challenges in preparing high-quality devices. In this work, we report a new wax-assisted exfoliation and transfer method that enables the fabrication of MnBi$_2$Te$_4$ heterostructures with both surfaces encapsulated by AlO$_x$. This strategy strongly enhances the topological quantum phases in MnBi$_2$Te$_4$ flakes. We observe the robust axion insulator state in even-layer device with wide zero Hall plateau and high longitudinal resistivity, and the quantum anomalous Hall effect in odd-layer device with large hysteresis and sharp plateau transition. These results demonstrate that the combination of wax exfoliation and AlO$_x$ encapsulation provides great potentials for exploring novel topological quantum phenomena and potential applications in MnBi$_2$Te$_4$ and other two-dimensional materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_04901 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Strongly enhanced topological quantum phases in dual-surface AlO$_x$-encapsulated MnBi$_2$Te$_4$ Lian, Zichen Wang, Yongqian Wang, Yongchao Xu, Liangcai Zhang, Jinsong Liu, Chang Wang, Yayu Materials Science Mesoscale and Nanoscale Physics The topological quantum phases in antiferromagnetic topological insulator MnBi$_2$Te$_4$ hold promise for next-generation spintronics, but their experimental realization has been constrained by challenges in preparing high-quality devices. In this work, we report a new wax-assisted exfoliation and transfer method that enables the fabrication of MnBi$_2$Te$_4$ heterostructures with both surfaces encapsulated by AlO$_x$. This strategy strongly enhances the topological quantum phases in MnBi$_2$Te$_4$ flakes. We observe the robust axion insulator state in even-layer device with wide zero Hall plateau and high longitudinal resistivity, and the quantum anomalous Hall effect in odd-layer device with large hysteresis and sharp plateau transition. These results demonstrate that the combination of wax exfoliation and AlO$_x$ encapsulation provides great potentials for exploring novel topological quantum phenomena and potential applications in MnBi$_2$Te$_4$ and other two-dimensional materials. |
| title | Strongly enhanced topological quantum phases in dual-surface AlO$_x$-encapsulated MnBi$_2$Te$_4$ |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2506.04901 |