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Exotic pressure-driven band gap widening in carbon chain-filled KFI zeolite and its pathway to high-pressure semiconducting technologies and high-temperature superconductivity
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DOI：10.1016/j.mtadv.2026.100903.png)
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Abstract
En 中文
Semiconducting devices face persistent challenges in operating at high pressure, as the band gap is always closed. However, our findings with carbon chains in KFI substrates reveal a conditional deviation from this norm. We not only witness the transition from polyyne (semiconductor) to cumulene (metal) at medium pressure, but we also observe an unexpected re-entrance of the polyyne at high pressures. In addition, the synthesis of long cumulene chains has posed a longstanding challenge in the quest for high-temperature organic superconductivity. We have identified scientific conditions for synthesizing extended cumulene chains within zeolite frameworks. The KFI zeolite could facilitate the formation of long carbon chains, far exceeding ∼100 other zeolite frameworks that restrict chain growth to ∼10 atoms. The cumulene@KFI system demonstrates a high superconducting transition temperature reaching ∼71 K, which could be further enhanced through modulating the electron correlations. Our research calls for a re-evaluation of the commonly held belief that the band gap of carbon always decreases under high pressure, and reveals that the formation of long cumulene may not always be contingent upon intricate end-group designs. We also advocate for reconsidering the 10-year belief that carbon nanotubes are the only host for producing long carbon chains, and demonstrate that appropriately tuned van der Waals forces can generate molecular torsion as strong as external electric or magnetic fields.
Keywords:
Carbon chain
High-pressure semiconducting devices
Superconductivity
Zeolite
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