Scientists from MIT, Harvard University, and Japan's National Institute for Materials Science have published a paper in Physical Review Letters revealing the mechanism of unconventional superconductivity in twisted trilayer graphene. The study finds that this material exhibits remarkable tunable dynamic inductance, offering potential for quantum technology applications.

Building on the 2018 discovery of superconductivity in magic-angle twisted bilayer graphene, the research team further explored superconducting behavior in twisted trilayer graphene. By constructing superconducting Josephson junctions, the scientists observed, for the first time, a low-resistance state and magnetic field repulsion under specific conditions, confirming its superconducting properties. Co-author Paritosh Karnatak stated: "We achieved precise control of superconductivity by tuning the doping state via gate voltage."

Experimental data shows that the dynamic inductance of twisted trilayer graphene reaches 50 times that of conventional superconductors. This high dynamic inductance holds application potential in fields such as single-photon detectors and qubits. Co-senior author Christian Schönenberger noted: "The inverse relationship between kinetic inductance and critical current reveals the coherence length of electron pairs, providing a new perspective for understanding unconventional superconductivity mechanisms."

In the future, the team plans to further validate the material’s quantum properties through high-frequency circuit experiments. Although lab-fabricated twisted graphene is challenging for large-scale applications, the study points the way toward exploring other graphene-based superconducting materials. Karnatak added: "The experimental methods we developed can be used to study more potential superconducting systems."