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Tuning superconductivity in twisted bilayer graphene

Matthew YankowitzDepartment of Physics, Columbia University, New York, NY 10027, USAShaowen ChenDepartment of Applied Physics and Applied Mathematics, Columbia University, New York, NY 10027, USAHryhoriy PolshynDepartment of Physics, University of California, Santa Barbara, CA 93106, USAYuxuan ZhangDepartment of Physics, University of California, Santa Barbara, CA 93106, USAKenji WatanabeNational Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, JapanT. TaniguchiNational Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, JapanDavid GrafNational High Magnetic Field Laboratory, Tallahassee, FL 32310, USAAndrea F. YoungDepartment of Physics, University of California, Santa Barbara, CA 93106, USACory R. DeanDepartment of Physics, Columbia University, New York, NY 10027, USA

2019en

ABI

Annotatsiya

Materials with flat electronic bands often exhibit exotic quantum phenomena owing to strong correlations. An isolated low-energy flat band can be induced in bilayer graphene by simply rotating the layers by 1.1°, resulting in the appearance of gate-tunable superconducting and correlated insulating phases. In this study, we demonstrate that in addition to the twist angle, the interlayer coupling can be varied to precisely tune these phases. We induce superconductivity at a twist angle larger than 1.1°-in which correlated phases are otherwise absent-by varying the interlayer spacing with hydrostatic pressure. Our low-disorder devices reveal details about the superconducting phase diagram and its relationship to the nearby insulator. Our results demonstrate twisted bilayer graphene to be a distinctively tunable platform for exploring correlated states.

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DOI: 10.1126/science.aav1910

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