GoKawiilMolecular spin chains show length-dependent coupling to superconductors
Researchers built chains of spin-1 triangulene molecules on a superconducting Au(111)/Nb(110) surface and measured their behavior with scanning tunnelling spectroscopy. They found that chains with an odd number of units develop in-gap Yu-Shiba-Rusinov states tied to a collective spin-1 ground state, while even-length chains settle into a spin-0 state that stays decoupled from the superconductor.
GoKawiil's interpretation of the reporting above, not reported fact.
The finding suggests that simply adjusting the number of molecular units in a chain could let researchers switch coupling to a superconductor on or off, which the authors propose as a route toward molecular spin qubits built from carbon-based materials. This length-tunability could offer a new design parameter for hybrid spin-superconductor devices that previously depended on other, less controllable variables.
- Odd-length triangulene chains form Yu-Shiba-Rusinov bound states inside the superconducting gap due to a spin-1 ground state
- Even-length chains form a spin-0 ground state that remains decoupled from the superconductor
- A two-site model and extra-gap spin excitations confirm that chain parity governs edge-spin coupling strength and sign
Source: nature.com — Vaxevani, 2026-10-14
Published there as: “Parity-dependent coupling of molecular spin chains to a superconductor”
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