Anisotropic non-split zero-energy vortex bound states in a conventional superconductor
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2021
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| _version_ | 1866910481295343616 |
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| author | Kim, Howon Nagai, Yuki Rózsa, Levente Schreyer, Dominik Wiesendanger, Roland |
| author_facet | Kim, Howon Nagai, Yuki Rózsa, Levente Schreyer, Dominik Wiesendanger, Roland |
| contents | Vortices in topological superconductors are predicted to host Majorana bound states (MBSs) as exotic quasiparticles. In recent experiments, the spatially non-split zero-energy vortex bound state in topological superconductors has been regarded as an essential spectroscopic signature for the observation of MBSs. Here, we report the observation of anisotropic non-split zero-energy vortex bound states in a conventional elemental superconductor with a topologically trivial band structure using scanning tunneling microscopy and spectroscopy. The experimental results, corroborated by quasi-classical theoretical calculations, indicate that the non-split states directly reflect the quasiparticle trajectories governed by the surface electronic structure. Our study implies that non-split zero-energy states are not a conclusive signature of MBSs in vortex cores, stimulating a revision of the current understanding of such states. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2105_01354 |
| institution | arXiv |
| publishDate | 2021 |
| record_format | arxiv |
| spellingShingle | Anisotropic non-split zero-energy vortex bound states in a conventional superconductor Kim, Howon Nagai, Yuki Rózsa, Levente Schreyer, Dominik Wiesendanger, Roland Superconductivity Vortices in topological superconductors are predicted to host Majorana bound states (MBSs) as exotic quasiparticles. In recent experiments, the spatially non-split zero-energy vortex bound state in topological superconductors has been regarded as an essential spectroscopic signature for the observation of MBSs. Here, we report the observation of anisotropic non-split zero-energy vortex bound states in a conventional elemental superconductor with a topologically trivial band structure using scanning tunneling microscopy and spectroscopy. The experimental results, corroborated by quasi-classical theoretical calculations, indicate that the non-split states directly reflect the quasiparticle trajectories governed by the surface electronic structure. Our study implies that non-split zero-energy states are not a conclusive signature of MBSs in vortex cores, stimulating a revision of the current understanding of such states. |
| title | Anisotropic non-split zero-energy vortex bound states in a conventional superconductor |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2105.01354 |