One dimensional edge localized YSR states in CrCl3 on NbSe2

Jan Cuperus; Arnold Kole; A.R. Botello-Méndez; Zeila Zanolli; Daniel Vanmaekelbergh; Ingmar Swart

doi:10.1038/s41535-025-00759-2

One dimensional edge localized YSR states in CrCl3 on NbSe2

Jan Cuperus, Arnold Kole, A.R. Botello-Méndez, Zeila Zanolli^*, Daniel Vanmaekelbergh, Ingmar Swart

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

Magnet/superconductor hybrid systems have been put forward as a platform for realizing topological superconductivity. We investigated the heterostructure of ferromagnetic monolayer CrCl3 and superconducting NbSe2. Using low-temperature scanning tunneling microscopy, we observe topologically trivial Yu-Shiba-Rusinov (YSR) states localized at the edge of CrCl3 islands. DFT simulations reveal that the Cr atoms at the edge have an enhanced d-orbital DOS close to EF. This leads to an exchange coupling between these atoms and the substrate that rationalizes the edge-localization of the YSR states.

Original language	English
Article number	51
Journal	npj Quantum Materials
Volume	10
Issue number	1
DOIs	https://doi.org/10.1038/s41535-025-00759-2
Publication status	Published - 2025

Bibliographical note

Publisher Copyright:
© The Author(s) 2025.

Funding

I.S. gratefully acknowledges funding by the European Research Council (Horizon 2020 “FRACTAL”, 865570). Z.Z., D.V. and I.S. acknowledge the research program “Materials for the Quantum Age” (QuMat) for financial support. This program (Registration Number 024.005.006) is part of the Gravitationprogram financed by the Dutch Ministry of Education, Culture and Science (OCW). Z.Z. acknowledges funding from the European Union’s Horizon Europe research and innovation programme under grant agreement No 101130384 (QUONDENSATE). This work was sponsored by NWO-Domain Science for the use of supercomputer facilities (Snellius, Dutch National Supercomputer). We also acknowledge that the results of this research have been achieved using the Tier-0 PRACE Research Infrastructure resource Discoverer based in Sofia, Bulgaria (OptoSpin project id. 2020225411).

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Cite this

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abstract = "Magnet/superconductor hybrid systems have been put forward as a platform for realizing topological superconductivity. We investigated the heterostructure of ferromagnetic monolayer CrCl3 and superconducting NbSe2. Using low-temperature scanning tunneling microscopy, we observe topologically trivial Yu-Shiba-Rusinov (YSR) states localized at the edge of CrCl3 islands. DFT simulations reveal that the Cr atoms at the edge have an enhanced d-orbital DOS close to EF. This leads to an exchange coupling between these atoms and the substrate that rationalizes the edge-localization of the YSR states.",

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AU - Kole, Arnold

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AU - Vanmaekelbergh, Daniel

AU - Swart, Ingmar

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AB - Magnet/superconductor hybrid systems have been put forward as a platform for realizing topological superconductivity. We investigated the heterostructure of ferromagnetic monolayer CrCl3 and superconducting NbSe2. Using low-temperature scanning tunneling microscopy, we observe topologically trivial Yu-Shiba-Rusinov (YSR) states localized at the edge of CrCl3 islands. DFT simulations reveal that the Cr atoms at the edge have an enhanced d-orbital DOS close to EF. This leads to an exchange coupling between these atoms and the substrate that rationalizes the edge-localization of the YSR states.

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One dimensional edge localized YSR states in CrCl3 on NbSe2

Abstract

Bibliographical note

Funding

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