Toward Gate-Tunable Topological Superconductivity in a Supramolecular Electron Spin Lattice

Low-dimensional magnet/superconductor hybrid systems have been proposed as a platform for achieving topological superconductivity. Here we showcase the supramolecular assembly of organic radicals directly on superconducting Pb(111), whose charge state can be controlled from anionic to neutral by the electric field of the scanning tunneling microscope. The anionic molecules obtained by an electron given by the substrate carry a spin-1/2 state and form a two-dimensional spin lattice, as confirmed by the observation of Yu-Shiba-Rusinov subgap states in tunneling spectra. At the boundary of the molecular domains, low-energy subgap states appear localized with high intensity at edges compared to the interior of the island. Tight-binding simulations suggest that their localization and spectral signatures are consistent with the emergence of topologically protected modes. Our results pave the way for the design of organic/superconductor hybrid systems with the potential to realize topological superconductivity.

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Publication Details

Journal
Nano Letters
Published
2025-10-08
DOI
https://doi.org/10.1021/acs.nanolett.5c03396
Citations
2
Primary Topic
Topological Materials and Phenomena
Type
article
Field-Weighted Citation Impact
2.49
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article

Toward Gate-Tunable Topological Superconductivity in a Supramolecular Electron Spin Lattice

Daniel Loss, Ernst Meyer, Ulrich Aschauer, Silvio Decurtins et al.
2 citations
Nano Letters
Topological Materials and Phenomena
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article

Toward Gate-Tunable Topological Superconductivity in a Supramolecular Electron Spin Lattice

Daniel Loss, Ernst Meyer, Ulrich Aschauer, Silvio Decurtins, Wulf Wulfhekel, Shi‐Xia Liu, Jelena Klinovaja, Richard S. Hess, Thilo Glatzel, Jung‐Ching Liu, Robert Häner, Rémy Pawlak, Carl Drechsel, Chao Li, Hongyan Chen, Xinyi Liu, Ping Zhou
article en
2 citations

Abstract

Low-dimensional magnet/superconductor hybrid systems have been proposed as a platform for achieving topological superconductivity. Here we showcase the supramolecular assembly of organic radicals directly on superconducting Pb(111), whose charge state can be controlled from anionic to neutral by the electric field of the scanning tunneling microscope. The anionic molecules obtained by an electron given by the substrate carry a spin-1/2 state and form a two-dimensional spin lattice, as confirmed by the observation of Yu-Shiba-Rusinov subgap states in tunneling spectra. At the boundary of the molecular domains, low-energy subgap states appear localized with high intensity at edges compared to the interior of the island. Tight-binding simulations suggest that their localization and spectral signatures are consistent with the emergence of topologically protected modes. Our results pave the way for the design of organic/superconductor hybrid systems with the potential to realize topological superconductivity.

Nano LettersVol. 25(42)
Karlsruhe Institute of Technology (DE), University of Bern (CH), University of Salzburg (AT), University of Basel (CH), Fachhochschule Salzburg (AT)
Openalex Percentile: Top 10%
Topological Materials and Phenomena
2.49
DOIOpen Access PDFOpenAlex
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