Coexistence of superconductivity and topological band in a van der Waals Sn1-xInxBi2Te4 crystal
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arXiv
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| Auteurs principaux: | , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866909604415275008 |
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| author | Jeon, Hoyeon Hus, Saban Park, Jewook Lu, Qiangsheng Kang, Seoung-Hun Yoon, Mina Moore, Robert G. Yan, Jiaqiang McGuire, Michael A. Li, An-Ping |
| author_facet | Jeon, Hoyeon Hus, Saban Park, Jewook Lu, Qiangsheng Kang, Seoung-Hun Yoon, Mina Moore, Robert G. Yan, Jiaqiang McGuire, Michael A. Li, An-Ping |
| contents | The realization of topological surface states and superconductivity within a single material platform is a crucial step toward achieving topologically nontrivial superconductivity. This can be achieved at an interface between a superconductor and a topological insulator, or within a single material that intrinsically hosts both superconductivity and topological surface states. Here we use scanning tunneling microscopy to study Sn1-xInxBi2Te4 crystals. Spectroscopic evidence reveals the coexistence of topological surface states and superconductivity on the same surface of the crystals. The Te-terminated surface exhibits a single U-shaped superconducting gap with a size of up to 311 μeV, alongside Dirac bands outside the gap. Analysis of the vortex structure and differential conductance suggests weak-coupling s-wave superconductivity. The absence of observed zero modes suggests that shifting the Fermi level closer to the Dirac point of the topological bands is necessary to realize a topological superconducting state. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_04729 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Coexistence of superconductivity and topological band in a van der Waals Sn1-xInxBi2Te4 crystal Jeon, Hoyeon Hus, Saban Park, Jewook Lu, Qiangsheng Kang, Seoung-Hun Yoon, Mina Moore, Robert G. Yan, Jiaqiang McGuire, Michael A. Li, An-Ping Superconductivity The realization of topological surface states and superconductivity within a single material platform is a crucial step toward achieving topologically nontrivial superconductivity. This can be achieved at an interface between a superconductor and a topological insulator, or within a single material that intrinsically hosts both superconductivity and topological surface states. Here we use scanning tunneling microscopy to study Sn1-xInxBi2Te4 crystals. Spectroscopic evidence reveals the coexistence of topological surface states and superconductivity on the same surface of the crystals. The Te-terminated surface exhibits a single U-shaped superconducting gap with a size of up to 311 μeV, alongside Dirac bands outside the gap. Analysis of the vortex structure and differential conductance suggests weak-coupling s-wave superconductivity. The absence of observed zero modes suggests that shifting the Fermi level closer to the Dirac point of the topological bands is necessary to realize a topological superconducting state. |
| title | Coexistence of superconductivity and topological band in a van der Waals Sn1-xInxBi2Te4 crystal |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2505.04729 |