Historical research guide · 0506 · 2026
Evidence for vacuum-enhanced superconductivity in NbSe2
Zheyan Wang · Gabriel Cardoso · Liu Yang · Xun Gong · Chi Zhang · Yufei Zhu · Dongbo Zhang · Nan Pan · Hongbing Cai · Yong P. Chen · Qing-Dong Jiang · Guanghui Cheng · Frank Wilczek · Changgan Zeng
In one minute
A team at the University of Science and Technology of China in Hefei, working with Qing-Dong Jiang at the Tsung-Dao Lee Institute in Shanghai and with Frank Wilczek, report that they made a superconductor work better by changing the empty space around it. Their sample is niobium diselenide, a layered material whose superconducting behaviour is thoroughly mapped, so any change in it stands out. They put it inside a split-ring cavity — a small resonator that reshapes which electromagnetic vacuum modes exist near the sample — and the temperature at which the material loses its electrical resistance goes up. Close to that transition the critical current and the critical magnetic field, the two limits on what a superconductor can carry, both rise sharply. Their calculations say why: mixing the electrons with the cavity’s fluctuating modes lowers the energy of the superconducting state, so the state survives further up in temperature. Nothing was injected, doped or strained. The material is untouched, and only its vacuum is different.
Connection
Chapter 2 argues that the vacuum is a structured medium you can engineer rather than an empty stage, and this is that argument turned into a laboratory knob: change the modes available to the vacuum in a small volume and a bulk property of the matter inside it moves. Chapter 11 takes it further, because superconductors are the material the gravity-coupling proposals keep coming back to, and chapter 6 keeps the ledger of what useful work the vacuum has been made to do.
From the source
Vacuum fluctuations offer a way to control material properties without touching the material — no doping, no injected carriers, no strain — and this work presents experimental evidence that they can enhance superconductivity.Abstract, first and second sentences
Niobium diselenide was chosen because it is a layered transition-metal dichalcogenide with well-characterised superconducting behaviour, which makes it a clear platform on which the effect can be seen against a known baseline.Abstract, third sentence
The team observed an increase in the critical temperature of superconducting niobium diselenide when the sample is embedded in a split-ring cavity resonator.Abstract, fourth sentence
Near the transition temperature the critical current and the critical field both increase dramatically — the two quantities that set how much current a superconductor carries and how much magnetic field it tolerates before it gives up superconducting.Abstract, fifth sentence
The observations agree with theoretical calculations in which hybridisation between the electronic degrees of freedom and the fluctuating cavity modes lowers the energy of the superconducting state, which is what allows that state to persist to a higher temperature.Abstract, sixth sentence
The authors present the result as a proof-of-principle demonstration that establishes a non-invasive technique for controlling superconductivity, the mainstay of quantum technology; how large the enhancement can be made, and how it behaves in other cavity geometries and other materials, is the measurement to follow.Abstract, closing sentence
The way in
https://doi.org/10.1038/s41586-026-11037-xHow to cite it
Zheyan Wang, Gabriel Cardoso, Liu Yang, Xun Gong, Chi Zhang, Yufei Zhu, Dongbo Zhang, Nan Pan, Hongbing Cai, Yong P. Chen, Qing-Dong Jiang, Guanghui Cheng, Frank Wilczek, Changgan Zeng (2026) Evidence for vacuum-enhanced superconductivity in NbSe2 doi:10.1038/s41586-026-11037-x