Topological Surface States of 3D Topological Insulator on Twisted Bilayer Graphene
Fuente:
arXiv
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866908349853859840 |
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| author | Kim, Yoonkang |
| author_facet | Kim, Yoonkang |
| contents | We present a comprehensive theoretical study of the topological surface states (TSS) of Bi$_2$Se$_3$, a 3D topological insulator, epitaxially grown on twisted bilayer graphene (tBG). The moiré potential induced by tBG folds the TSS Dirac cone into the moiré Brillouin zone (MBZ), resulting in mini-gap openings, band flattening, and the potential emergence of secondary Dirac points. Using effective field theory, symmetry analysis, and higher-order perturbation theory, we analyze both commensurate and incommensurate twist angles, revealing significant band structure reconstruction in periodic systems and quasi-periodic effects in incommensurate ones. This work provides deep insights into the interplay between topological protection and moiré modulation, offering a pathway to engineer novel topological phases. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_02187 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Topological Surface States of 3D Topological Insulator on Twisted Bilayer Graphene Kim, Yoonkang Mesoscale and Nanoscale Physics Quantum Physics We present a comprehensive theoretical study of the topological surface states (TSS) of Bi$_2$Se$_3$, a 3D topological insulator, epitaxially grown on twisted bilayer graphene (tBG). The moiré potential induced by tBG folds the TSS Dirac cone into the moiré Brillouin zone (MBZ), resulting in mini-gap openings, band flattening, and the potential emergence of secondary Dirac points. Using effective field theory, symmetry analysis, and higher-order perturbation theory, we analyze both commensurate and incommensurate twist angles, revealing significant band structure reconstruction in periodic systems and quasi-periodic effects in incommensurate ones. This work provides deep insights into the interplay between topological protection and moiré modulation, offering a pathway to engineer novel topological phases. |
| title | Topological Surface States of 3D Topological Insulator on Twisted Bilayer Graphene |
| topic | Mesoscale and Nanoscale Physics Quantum Physics |
| url | https://arxiv.org/abs/2505.02187 |