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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2601.11339 |
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| _version_ | 1866909992533098496 |
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| author | Tian, Shangjie Zhang, Yuchong Liang, Chenhao Cao, Yuqing Lv, Wenxin Lv, Xingyu Wang, Zhijun Qian, Tian Lei, Hechang Wang, Shouguo |
| author_facet | Tian, Shangjie Zhang, Yuchong Liang, Chenhao Cao, Yuqing Lv, Wenxin Lv, Xingyu Wang, Zhijun Qian, Tian Lei, Hechang Wang, Shouguo |
| contents | The exploration of novel topological insulators (TIs) beyond binary chalcogenides has been accelerated in pursuit of exotic quantum states and device applications. Here, the layered ternary chalcogenide Ge2Bi2Te5 is identified as a three-dimensional TI. The bulk electronic structure of Ge2Bi2Te5 features a hole-type Fermi surface at Fermi level EF, which dominates the transport properties. Moreover, an unoccupied topological surface state with a Dirac point located at 290 meV above EF has been observed. Theoretical calculations confirm a bulk bandgap and a nontrivial Z2 topological invariant (000;1). The present study demonstrates that the material family of layered tetradymite-like ternary compounds is an important platform to explore exotic topological phenomena. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_11339 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Three-dimensional topological insulator feature of ternary chalcogenide Ge2Bi2Te5 Tian, Shangjie Zhang, Yuchong Liang, Chenhao Cao, Yuqing Lv, Wenxin Lv, Xingyu Wang, Zhijun Qian, Tian Lei, Hechang Wang, Shouguo Strongly Correlated Electrons Materials Science The exploration of novel topological insulators (TIs) beyond binary chalcogenides has been accelerated in pursuit of exotic quantum states and device applications. Here, the layered ternary chalcogenide Ge2Bi2Te5 is identified as a three-dimensional TI. The bulk electronic structure of Ge2Bi2Te5 features a hole-type Fermi surface at Fermi level EF, which dominates the transport properties. Moreover, an unoccupied topological surface state with a Dirac point located at 290 meV above EF has been observed. Theoretical calculations confirm a bulk bandgap and a nontrivial Z2 topological invariant (000;1). The present study demonstrates that the material family of layered tetradymite-like ternary compounds is an important platform to explore exotic topological phenomena. |
| title | Three-dimensional topological insulator feature of ternary chalcogenide Ge2Bi2Te5 |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2601.11339 |