Gate-tunable topological superconductivity in a supramolecular electron spin lattice

Liu, Jung-Ching; Li, Chao; Hess, Richard; Chen, Hongyan; Drechsel, Carl; Zhou, Ping; Häner, Robert; Aschauer, Ulrich; Glatzel, Thilo; Decurtins, Silvio; Loss, Daniel; Klinovaja, Jelena; Liu, Shi-Xia; Wulfhekel, Wulf; Meyer, Ernst; Pawlak, Rémy (27 October 2023). Gate-tunable topological superconductivity in a supramolecular electron spin lattice (Cornell University). arXiv 10.48550/arxiv.2310.18134

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Topological superconductivity emerges in chains or arrays of magnetic atoms coupled to a superconductor. However, the external controllability of such systems with gate voltages is detrimental for their future implementation in a topological quantum computer. Here we showcase the supramolecular assembly of radical molecules on Pb(111), whose discharge is controlled by the tip of a scanning tunneling microscope. Charged molecules carry a spin-1/2 state, as confirmed by observing Yu-Shiba-Rusinov in-gap states by tunneling spectroscopy at millikelvin temperature. Low energy modes are localized at island boundaries with a long decay towards the interior, whose spectral signature is consistent with Majorana zero modes protected by mirror symmetry. Our results open up a vast playground for the synthesis of gate-tunable organic topological superconductors.

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