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| Autores principales: | , , , , , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| Materias: | |
| Acceso en línea: | https://arxiv.org/abs/2602.03937 |
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| _version_ | 1866914339072507904 |
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| author | Yang, Xian P. Hsu, Chia-Hsiu Acharya, Gokul Zhang, Junyi Hossain, Md Shafayat Cochran, Tyler A. Neupane, Bimal Cheng, Zi-Jia Chhetri, Santosh Karki Kim, Byunghoon Gao, Shiyuan Jiang, Yu-Xiao Litskevich, Maksim Wang, Jian Wang, Yuanxi Hu, Jin Hasan, M. Zahid |
| author_facet | Yang, Xian P. Hsu, Chia-Hsiu Acharya, Gokul Zhang, Junyi Hossain, Md Shafayat Cochran, Tyler A. Neupane, Bimal Cheng, Zi-Jia Chhetri, Santosh Karki Kim, Byunghoon Gao, Shiyuan Jiang, Yu-Xiao Litskevich, Maksim Wang, Jian Wang, Yuanxi Hu, Jin Hasan, M. Zahid |
| contents | Topological materials hold immense promise for exhibiting exotic quantum phenomena, yet achieving controllable topological phase transitions remains challenging. Here, we demonstrate a structurally driven, reversible topological phase transition in the distorted square net material GdPS, induced via in situ potassium dosing. Using angle-resolved photoemission spectroscopy and first principles calculations, we demonstrate a cascade of topological phases in the sub-surface P layer: from a large, topologically trivial band gap to a gapless Dirac cone state with a 2 eV dispersion, and finally to a two-dimensional topological insulator as inferred from theory. This evolution is driven by subtle structural distortions in the first P layer caused by potassium adsorption, which in turn contribute to the band gap closure and topological phase transition. Furthermore, the ability to manipulate the topology of a sub-surface layer in GdPS offers a unique route for exploring and controlling topological states in bulk materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_03937 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Observation of a structurally driven, reversible topological phase transition in a distorted square net material Yang, Xian P. Hsu, Chia-Hsiu Acharya, Gokul Zhang, Junyi Hossain, Md Shafayat Cochran, Tyler A. Neupane, Bimal Cheng, Zi-Jia Chhetri, Santosh Karki Kim, Byunghoon Gao, Shiyuan Jiang, Yu-Xiao Litskevich, Maksim Wang, Jian Wang, Yuanxi Hu, Jin Hasan, M. Zahid Materials Science Strongly Correlated Electrons Topological materials hold immense promise for exhibiting exotic quantum phenomena, yet achieving controllable topological phase transitions remains challenging. Here, we demonstrate a structurally driven, reversible topological phase transition in the distorted square net material GdPS, induced via in situ potassium dosing. Using angle-resolved photoemission spectroscopy and first principles calculations, we demonstrate a cascade of topological phases in the sub-surface P layer: from a large, topologically trivial band gap to a gapless Dirac cone state with a 2 eV dispersion, and finally to a two-dimensional topological insulator as inferred from theory. This evolution is driven by subtle structural distortions in the first P layer caused by potassium adsorption, which in turn contribute to the band gap closure and topological phase transition. Furthermore, the ability to manipulate the topology of a sub-surface layer in GdPS offers a unique route for exploring and controlling topological states in bulk materials. |
| title | Observation of a structurally driven, reversible topological phase transition in a distorted square net material |
| topic | Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2602.03937 |