Topological Flat Minibands and Fractional Chern Insulators in Rashba Systems with Tunable Superlattice Potentials
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arXiv
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866915550504943616 |
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| author | Liang, Bokai Qin, Wei Zhang, Zhenyu |
| author_facet | Liang, Bokai Qin, Wei Zhang, Zhenyu |
| contents | We propose a programmable platform for engineering topological flat minibands by imposing a tunable electrostatic superlattice potential on a Rashba spin-orbit-coupled thin film subject to a Zeeman field. The interplay between the superlattice potential and Zeeman coupling produces an isolated flat miniband with Chern number $\mathcal{C}=1$. Using many-body exact diagonalization, we show that this miniband supports fractional Chern insulators at filling factors $n = 1/3$ and $2/3$, both of which remain robust over broad parameter ranges. We further identify realistic material candidates and the corresponding device conditions that enable experimental realization. These results establish a versatile and experimentally accessible platform for engineering topological flat minibands and exploring correlated topological phases. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_22173 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Topological Flat Minibands and Fractional Chern Insulators in Rashba Systems with Tunable Superlattice Potentials Liang, Bokai Qin, Wei Zhang, Zhenyu Mesoscale and Nanoscale Physics Strongly Correlated Electrons We propose a programmable platform for engineering topological flat minibands by imposing a tunable electrostatic superlattice potential on a Rashba spin-orbit-coupled thin film subject to a Zeeman field. The interplay between the superlattice potential and Zeeman coupling produces an isolated flat miniband with Chern number $\mathcal{C}=1$. Using many-body exact diagonalization, we show that this miniband supports fractional Chern insulators at filling factors $n = 1/3$ and $2/3$, both of which remain robust over broad parameter ranges. We further identify realistic material candidates and the corresponding device conditions that enable experimental realization. These results establish a versatile and experimentally accessible platform for engineering topological flat minibands and exploring correlated topological phases. |
| title | Topological Flat Minibands and Fractional Chern Insulators in Rashba Systems with Tunable Superlattice Potentials |
| topic | Mesoscale and Nanoscale Physics Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2506.22173 |