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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2506.20510 |
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| _version_ | 1866912449736736768 |
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| author | Tanabe, Yoichi Tu, Ngoc Han Jiang, Ming-Chun Chiew, Yi Ling Haruta, Mitsutaka Adachi, Kiyohiro Pomaranski, David Ito, Ryo Shimazaki, Yuya Hashizume, Daisuke Yu, Xiuzhen Guo, Guang-Yu Arita, Ryotaro Yamamoto, Michihisa |
| author_facet | Tanabe, Yoichi Tu, Ngoc Han Jiang, Ming-Chun Chiew, Yi Ling Haruta, Mitsutaka Adachi, Kiyohiro Pomaranski, David Ito, Ryo Shimazaki, Yuya Hashizume, Daisuke Yu, Xiuzhen Guo, Guang-Yu Arita, Ryotaro Yamamoto, Michihisa |
| contents | Van der Waals heterostructures have been used to tailor atomic layers into various artificial materials through interactions at heterointerfaces. The interplay between the band gap created by the band folding of the interfacial potential and the band inversion driven by enhanced spin-orbit interaction (SOI) through band hybridization enables us to realize a two-dimensional topological insulator (2D-TI). Here we report the realization of graphene 2D-TIs by epitaxial growth of three-dimensional topological insulator (3D-TI) BiSbTeSe$_2$ ultrathin films on graphene. By increasing the BiSbTeSe$_2$ thickness from 2 nm to 9 nm to enhance SOI on graphene, the electronic state is altered from the trivial Kekul${é}$ insulator to the 2D-TI. The nonlocal transport reveals the helical edge conduction which survives up to 200 K at maximum. Our graphene 2D-TI is stable, easy to make electrical contacts, and of high quality. It offers various applications including spin-current conversion and platforms for Majorana fermions in junctions to superconductors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_20510 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | High-temperature helical edge states in BiSbTeSe$_2$/graphene van der Waals heterostructure Tanabe, Yoichi Tu, Ngoc Han Jiang, Ming-Chun Chiew, Yi Ling Haruta, Mitsutaka Adachi, Kiyohiro Pomaranski, David Ito, Ryo Shimazaki, Yuya Hashizume, Daisuke Yu, Xiuzhen Guo, Guang-Yu Arita, Ryotaro Yamamoto, Michihisa Mesoscale and Nanoscale Physics Materials Science Van der Waals heterostructures have been used to tailor atomic layers into various artificial materials through interactions at heterointerfaces. The interplay between the band gap created by the band folding of the interfacial potential and the band inversion driven by enhanced spin-orbit interaction (SOI) through band hybridization enables us to realize a two-dimensional topological insulator (2D-TI). Here we report the realization of graphene 2D-TIs by epitaxial growth of three-dimensional topological insulator (3D-TI) BiSbTeSe$_2$ ultrathin films on graphene. By increasing the BiSbTeSe$_2$ thickness from 2 nm to 9 nm to enhance SOI on graphene, the electronic state is altered from the trivial Kekul${é}$ insulator to the 2D-TI. The nonlocal transport reveals the helical edge conduction which survives up to 200 K at maximum. Our graphene 2D-TI is stable, easy to make electrical contacts, and of high quality. It offers various applications including spin-current conversion and platforms for Majorana fermions in junctions to superconductors. |
| title | High-temperature helical edge states in BiSbTeSe$_2$/graphene van der Waals heterostructure |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2506.20510 |