Tunable quantum anomalous Hall effect in fullerene monolayers
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866912680300773376 |
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| author | Pingen, Leonard Werner Wu, Jiaqi Peng, Bo |
| author_facet | Pingen, Leonard Werner Wu, Jiaqi Peng, Bo |
| contents | Nearly four decades after its theoretical prediction, the search for material realizations of quantum anomalous Hall effect (QAHE) remains a highly active field of research. Many materials have been predicted to exhibit quantum anomalous Hall (QAH) physics under feasible conditions but the experimental verification remains widely elusive. In this work, we propose an alternative approach towards QAH materials design by engineering customized molecular building blocks. We demonstrate this ansatz for a two-dimensional (2D) honeycomb lattice of C26 fullerenes, which exhibits a ferromagnetic ground state and thus breaks time-reversal symmetry. The molecular system is found to be highly tunable with respect to its magnetic degrees of freedom and applied strain, giving rise to a rich phase diagram with Chern numbers C= +/-2, +/-1, 0. Our proposal offers a versatile platform to realize tunable QAH physics under accessible conditions and provides an experimentally feasible approach for chemical synthesis of molecular networks with QAHE. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_19849 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Tunable quantum anomalous Hall effect in fullerene monolayers Pingen, Leonard Werner Wu, Jiaqi Peng, Bo Mesoscale and Nanoscale Physics Materials Science Chemical Physics Computational Physics Quantum Physics Nearly four decades after its theoretical prediction, the search for material realizations of quantum anomalous Hall effect (QAHE) remains a highly active field of research. Many materials have been predicted to exhibit quantum anomalous Hall (QAH) physics under feasible conditions but the experimental verification remains widely elusive. In this work, we propose an alternative approach towards QAH materials design by engineering customized molecular building blocks. We demonstrate this ansatz for a two-dimensional (2D) honeycomb lattice of C26 fullerenes, which exhibits a ferromagnetic ground state and thus breaks time-reversal symmetry. The molecular system is found to be highly tunable with respect to its magnetic degrees of freedom and applied strain, giving rise to a rich phase diagram with Chern numbers C= +/-2, +/-1, 0. Our proposal offers a versatile platform to realize tunable QAH physics under accessible conditions and provides an experimentally feasible approach for chemical synthesis of molecular networks with QAHE. |
| title | Tunable quantum anomalous Hall effect in fullerene monolayers |
| topic | Mesoscale and Nanoscale Physics Materials Science Chemical Physics Computational Physics Quantum Physics |
| url | https://arxiv.org/abs/2508.19849 |