A robust weak topological insulator in a bismuth halide Bi4Br2I2
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2023
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| _version_ | 1866910620419358720 |
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| author | Noguchi, Ryo Kobayashi, Masaru Kawaguchi, Kaishu Lin, Chun Tanaka, Hiroaki Kuroda, Kenta Harasawa, Ayumi Kandyba, Viktor Cattelan, Mattia Barinov, Alexei Hashimoto, Makoto Lu, Donghui Sasagawa, Takao Kondo, Takeshi |
| author_facet | Noguchi, Ryo Kobayashi, Masaru Kawaguchi, Kaishu Lin, Chun Tanaka, Hiroaki Kuroda, Kenta Harasawa, Ayumi Kandyba, Viktor Cattelan, Mattia Barinov, Alexei Hashimoto, Makoto Lu, Donghui Sasagawa, Takao Kondo, Takeshi |
| contents | We apply a topological material design concept for selecting a bulk topology of 3D crystals by different van-der-Waals stacking of 2D topological insulator layers, and find a bismuth halide Bi4Br2I2 to be an ideal weak topological insulator (WTI) with the largest band gap (~230 meV) among all the WTI candidates, by means of angle-resolved photoemission spectroscopy (ARPES), density functional theory (DFT) calculations, and resistivity measurements. Our results vastly expand future opportunities for fundamental research and device applications with a robust WTI. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2301_07158 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | A robust weak topological insulator in a bismuth halide Bi4Br2I2 Noguchi, Ryo Kobayashi, Masaru Kawaguchi, Kaishu Lin, Chun Tanaka, Hiroaki Kuroda, Kenta Harasawa, Ayumi Kandyba, Viktor Cattelan, Mattia Barinov, Alexei Hashimoto, Makoto Lu, Donghui Sasagawa, Takao Kondo, Takeshi Materials Science We apply a topological material design concept for selecting a bulk topology of 3D crystals by different van-der-Waals stacking of 2D topological insulator layers, and find a bismuth halide Bi4Br2I2 to be an ideal weak topological insulator (WTI) with the largest band gap (~230 meV) among all the WTI candidates, by means of angle-resolved photoemission spectroscopy (ARPES), density functional theory (DFT) calculations, and resistivity measurements. Our results vastly expand future opportunities for fundamental research and device applications with a robust WTI. |
| title | A robust weak topological insulator in a bismuth halide Bi4Br2I2 |
| topic | Materials Science |
| url | https://arxiv.org/abs/2301.07158 |