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This study resolves conflicting interpretations of pairing mechanisms in magic-angle twisted bilayer graphene by demonstrating that superconductivity persists under strong electrostatic screening, unlike correlated insulator states which are suppressed. By utilizing stacked layers with high twist angles to maximize screening efficiency, researchers successfully decouple these phenomena within a single device, providing clearer evidence against purely phonon-mediated theories and challenging existing models of unconventional superconductivity.

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Graphene’s superconductivity persists even with strong electrostatic control

Quantum ZeitgeistSeptember 2, 20265 min read

Magic-angle twisted bilayer graphene (TBG) exhibits superconductivity, and new research shows it remains stable even with strong electrostatic control.

Researchers have demonstrated complete suppression of superconductivity in magic-angle twisted bilayer graphene (TBG) through tunable electrostatic screening, achieving variations in critical temperature by more than an order of magnitude. The work challenges existing theories surrounding the unconventional origins of superconductivity in this material, where the maximum of the critical temperature T C roughly coincides with the 1.1° twist angle between graphene layers where the flattened energy bands maximize electron-electron interactions. Previous studies yielded conflicting results; V-shaped differential conductance in tunnelling spectra supported unconventional pairing, while experiments employing graphite gates pointed towards phonon-mediated superconductivity. The gates were separated by thin (6-10 nm) hexagonal boron nitride (hBN) spacers.…

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