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Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →Adding one triangulene molecule to a magnetic chain can change how the entire chain interacts with a superconductor. In the reported 2026 experiment, chains with an odd number of units coupled their fractional edge spins to the superconducting condensate and produced Yu–Shiba–Rusinov (YSR) states inside the superconducting energy gap. Chains with an even number formed a spin-singlet ground state and showed no corresponding coupling.
The result is a length-controlled quantum switch: changing the chain by one molecular unit changes its parity, and parity determines whether the molecular spins communicate with the superconductor.
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Why one molecule changes the chain
Parity here simply means whether the chain contains an even or odd number of triangulene units. Each triangulene is a triangular graphene fragment with spin S=1. When the units are linked antiferromagnetically, they form a molecular Haldane chain.
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A Haldane chain does not behave like a collection of independent spins. Its quantum state supports fractionalized edge moments: the two ends carry effective spin-1/2 states, half the spin of an individual triangulene unit. The interaction between those two ends depends on chain length. For one parity, the edge moments combine into a net spin; for the other, they cancel into a singlet.
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The molecules were assembled on a custom Au(111)/Nb(110) surface and examined with scanning tunnelling microscopy and spectroscopy. Gold is chemically suitable for on-surface molecular synthesis, but a free gold surface is not superconducting. To combine a clean molecular-growth surface with superconductivity, the team grew a 25–30-atomic-layer gold film on a niobium crystal. Superconducting properties from the niobium are transferred into the gold film by proximity, while the exposed gold surface remains usable for constructing the chains.
This architecture lets the microscope measure molecular spin states against a superconducting electronic background without placing the molecules directly on bare niobium, which would be less suitable for the intended synthesis.
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What changes between odd and even chains
| Chain property | Odd number of triangulenes | Even number of triangulenes |
|---|---|---|
| Global ground-state spin | S=1 | S=0 |
| Interaction with the superconducting condensate | Present | Absent in the measured ground state |
| Expected spectroscopic signature | Yu–Shiba–Rusinov states inside the superconducting gap | No corresponding YSR coupling |
| Role in a controlled experiment | Coupled molecular spin state | Decoupled reference state |
Odd chains retain a net magnetic moment because their two fractional edge spins do not fully cancel. That moment can exchange-couple to the superconducting condensate, creating YSR bound states. These are localized excitations that appear inside the energy gap opened by superconductivity.
Even chains instead settle into an S=0 ground state. With no uncompensated edge moment available to couple in the same way, the corresponding superconducting signature disappears.
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How the researchers identified the effect
Scanning tunnelling spectroscopy measures how electronic states vary with the voltage applied between the microscope tip and the sample. The parity dependence appeared directly in those spectra: odd-length chains displayed in-gap YSR features, while even-length chains did not show the equivalent coupling to the condensate.
The spectra also resolve ordinary molecular spin excitations. For a four-unit chain, terminal measurements showed peaks near 8.5 meV. The analysis assigned a singlet–triplet excitation energy of 6.3 meV to that chain. Because the four-unit chain is even, these peaks should not be confused with the in-gap YSR states that signal coupling of an uncompensated spin to the superconductor; they are evidence of the chain’s internal magnetic excitation structure.
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Why the alternation occurs
The Nature study attributes the odd–even pattern to the sign and magnitude of the interaction between the two chain ends. As units are added, the effective exchange linking the edge spins changes in a way that alternates with length. One parity therefore favors a triplet-like net state, while the other favors a singlet.
That exchange is the crucial link between molecular architecture and superconducting response. The experiment does not merely show that longer chains have different spectra; it shows that a one-unit change reverses whether the chain presents a magnetic moment that can bind to the condensate.
What the result could enable
Nacho Pascual of CIC nanoGUNE described the work as a method for turning interaction with the superconductor on or off by changing chain length by a single unit. The same platform could let researchers design magnetic states molecule by molecule and study how they interact with superconducting condensates.
- Spin-qubit research: parity-selected chains provide controllable molecular spin states for investigating possible qubit building blocks.
- Quantum correlations: the platform offers a way to vary edge-spin coupling while keeping the chemical building block the same.
- Topological phases: engineered chains can serve as test systems for how fractionalized boundary states behave near superconductivity.
These are research directions, not demonstrated consumer devices. The switch is presently implemented by synthesizing a chain with one more or one fewer molecule and then measuring it under a scanning-tunnelling microscope.
What the experiment does—and does not—show
The measurements establish a parity-dependent relationship between molecular chain length, total spin and superconducting coupling on this specific proximitized Au/Nb platform. They do not show a room-temperature component, a practical quantum computer, or a real-time molecular toggle operated like an electronic switch. The samples require specialized on-surface synthesis, a cryogenic superconducting environment and scanning-tunnelling spectroscopy.
Its importance is more fundamental: the experiment turns an abstract difference between even and odd quantum states into a measurable change in a superconductor’s local spectrum, using a single molecular unit as the control parameter.
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