Manipulation of Dirac states in polymorphic and dual topological insulating phases of van der Waals systems
Abstract Van der Waals (vdW) layered systems provide a versatile platform for exploring dual topological insulator phases, characterized by the coexistence of nontrivial $${{\mathbb{Z}}}_{2}$$ Z 2 invariants and mirror Chern numbers $${C}_{M}$$ C M . Here, we demonstrate that stacking sequences in v...
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Nature Portfolio
2025-06-01
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| Series: | npj 2D Materials and Applications |
| Online Access: | https://doi.org/10.1038/s41699-025-00573-1 |
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| author | Sangmin Lee Miyoung Kim Young-Kyun Kwon |
| author_facet | Sangmin Lee Miyoung Kim Young-Kyun Kwon |
| author_sort | Sangmin Lee |
| collection | DOAJ |
| description | Abstract Van der Waals (vdW) layered systems provide a versatile platform for exploring dual topological insulator phases, characterized by the coexistence of nontrivial $${{\mathbb{Z}}}_{2}$$ Z 2 invariants and mirror Chern numbers $${C}_{M}$$ C M . Here, we demonstrate that stacking sequences in vdW materials can introduce additional mirror symmetry, enabling surface states robust against perturbations through multiple symmetry protections. The polymorphic nature of these systems introduces stacking-dependent mirror planes, allowing control over the topology of surface Dirac states. We further show that the spin texture of these surface states determines the direction of Dirac point shifts under time-reversal symmetry breaking. This response reveals the interplay between spin momentum locking and external fields. Additionally, we find that surface responses to magnetic fields vary with termination layers, offering enhanced tunability. These results highlight the potential of vdW systems as robust platforms for realizing and manipulating symmetry-protected topological phases, with promising implications for spintronic and quantum device applications. |
| format | Article |
| id | doaj-art-a084ee2a60834658b2ecd2a0b2c6a97a |
| institution | OA Journals |
| issn | 2397-7132 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | npj 2D Materials and Applications |
| spelling | doaj-art-a084ee2a60834658b2ecd2a0b2c6a97a2025-08-20T02:06:31ZengNature Portfolionpj 2D Materials and Applications2397-71322025-06-01911710.1038/s41699-025-00573-1Manipulation of Dirac states in polymorphic and dual topological insulating phases of van der Waals systemsSangmin Lee0Miyoung Kim1Young-Kyun Kwon2Department of Materials Science & Engineering and Research Institute of Advanced Materials, Seoul National UniversityDepartment of Materials Science & Engineering and Research Institute of Advanced Materials, Seoul National UniversityDepartment of Physics, Department of Information Display, and Research Institute for Basic Sciences, Kyung Hee UniversityAbstract Van der Waals (vdW) layered systems provide a versatile platform for exploring dual topological insulator phases, characterized by the coexistence of nontrivial $${{\mathbb{Z}}}_{2}$$ Z 2 invariants and mirror Chern numbers $${C}_{M}$$ C M . Here, we demonstrate that stacking sequences in vdW materials can introduce additional mirror symmetry, enabling surface states robust against perturbations through multiple symmetry protections. The polymorphic nature of these systems introduces stacking-dependent mirror planes, allowing control over the topology of surface Dirac states. We further show that the spin texture of these surface states determines the direction of Dirac point shifts under time-reversal symmetry breaking. This response reveals the interplay between spin momentum locking and external fields. Additionally, we find that surface responses to magnetic fields vary with termination layers, offering enhanced tunability. These results highlight the potential of vdW systems as robust platforms for realizing and manipulating symmetry-protected topological phases, with promising implications for spintronic and quantum device applications.https://doi.org/10.1038/s41699-025-00573-1 |
| spellingShingle | Sangmin Lee Miyoung Kim Young-Kyun Kwon Manipulation of Dirac states in polymorphic and dual topological insulating phases of van der Waals systems npj 2D Materials and Applications |
| title | Manipulation of Dirac states in polymorphic and dual topological insulating phases of van der Waals systems |
| title_full | Manipulation of Dirac states in polymorphic and dual topological insulating phases of van der Waals systems |
| title_fullStr | Manipulation of Dirac states in polymorphic and dual topological insulating phases of van der Waals systems |
| title_full_unstemmed | Manipulation of Dirac states in polymorphic and dual topological insulating phases of van der Waals systems |
| title_short | Manipulation of Dirac states in polymorphic and dual topological insulating phases of van der Waals systems |
| title_sort | manipulation of dirac states in polymorphic and dual topological insulating phases of van der waals systems |
| url | https://doi.org/10.1038/s41699-025-00573-1 |
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