Publikation: Anisotropic non-split zero-energy vortex bound states in a conventional superconductor
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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, in particular for superconducting systems not being in the quantum limit, stimulating a revision of the current understanding of such states.
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KIM, Howon, Yuki NAGAI, Levente RÓZSA, Dominik SCHREYER, Roland WIESENDANGER, 2021. Anisotropic non-split zero-energy vortex bound states in a conventional superconductor. In: Applied Physics Reviews. American Institute of Physics (AIP). 2021, 8(3), 031417. eISSN 1931-9401. Available under: doi: 10.1063/5.0055839BibTex
@article{Kim2021Aniso-55805, year={2021}, doi={10.1063/5.0055839}, title={Anisotropic non-split zero-energy vortex bound states in a conventional superconductor}, number={3}, volume={8}, journal={Applied Physics Reviews}, author={Kim, Howon and Nagai, Yuki and Rózsa, Levente and Schreyer, Dominik and Wiesendanger, Roland}, note={Article Number: 031417} }
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