Band structure of Bi surfaces formed on Bi2Se3 upon exposure to air
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866917660885778432 |
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| author | Gauthier, Alexandre Sobota, Jonathan A. Gauthier, Nicolas Rotundu, Costel R. Shen, Zhi-Xun Kirchmann, Patrick S. |
| author_facet | Gauthier, Alexandre Sobota, Jonathan A. Gauthier, Nicolas Rotundu, Costel R. Shen, Zhi-Xun Kirchmann, Patrick S. |
| contents | Bi$_2$Se$_3$ has been the focus of intense interest over the past decade due to its topological properties. Bi surfaces are known to form on Bi$_2$Se$_3$ upon exposure to atmosphere, but their electronic structure has not been investigated. We report band structure measurements of such Bi surfaces using angle-resolved photoemission spectroscopy. Measured spectra can be well explained by the band structure of a single bilayer of Bi on Bi$_2$Se$_3$, and show that Bi surfaces consistently dominate the photoemission signal for air exposure times of at least 1 hour. These results demonstrate that atmospheric effects should be taken into consideration when identifying two-dimensional transport channels, and when designing surface-sensitive measurements of Bi$_2$Se$_3$, ideally limiting air exposure to no more than a few minutes. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_17203 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Band structure of Bi surfaces formed on Bi2Se3 upon exposure to air Gauthier, Alexandre Sobota, Jonathan A. Gauthier, Nicolas Rotundu, Costel R. Shen, Zhi-Xun Kirchmann, Patrick S. Mesoscale and Nanoscale Physics Bi$_2$Se$_3$ has been the focus of intense interest over the past decade due to its topological properties. Bi surfaces are known to form on Bi$_2$Se$_3$ upon exposure to atmosphere, but their electronic structure has not been investigated. We report band structure measurements of such Bi surfaces using angle-resolved photoemission spectroscopy. Measured spectra can be well explained by the band structure of a single bilayer of Bi on Bi$_2$Se$_3$, and show that Bi surfaces consistently dominate the photoemission signal for air exposure times of at least 1 hour. These results demonstrate that atmospheric effects should be taken into consideration when identifying two-dimensional transport channels, and when designing surface-sensitive measurements of Bi$_2$Se$_3$, ideally limiting air exposure to no more than a few minutes. |
| title | Band structure of Bi surfaces formed on Bi2Se3 upon exposure to air |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2404.17203 |