Superconductivity in metallic twisted bilayer graphene stabilized by WSe2.

Nature
Harpreet Singh AroraStevan Nadj-Perge

Abstract

Magic-angle twisted bilayer graphene (TBG), with rotational misalignment close to 1.1 degrees, features isolated flat electronic bands that host a rich phase diagram of correlated insulating, superconducting, ferromagnetic and topological phases1-6. Correlated insulators and superconductivity have been previously observed only for angles within 0.1 degree of the magic angle and occur in adjacent or overlapping electron-density ranges; nevertheless, the origins of these states and the relation between them remain unclear, owing to their sensitivity to microscopic details. Beyond twist angle and strain, the dependence of the TBG phase diagram on the alignment4,6 and thickness of the insulating hexagonal boron nitride (hBN)7,8 used to encapsulate the graphene sheets indicates the importance of the microscopic dielectric environment. Here we show that adding an insulating tungsten diselenide (WSe2) monolayer between the hBN and the TBG stabilizes superconductivity at twist angles much smaller than the magic angle. For the smallest twist angle of 0.79 degrees, superconductivity is still observed despite the TBG exhibiting metallic behaviour across the whole range of electron densities. Finite-magnetic-field measurements further reve...Continue Reading

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Citations

Jul 17, 2020·Nature·Ronny Thomale
Jan 20, 2021·Nature·Youngjoon ChoiStevan Nadj-Perge
Feb 20, 2021·Physical Review Letters·Tobias M R WolfJose L Lado
Apr 9, 2021·Nature·Yu SaitoAndrea F Young
May 14, 2021·Nature Communications·Xiaomeng LiuAli Yazdani
Jun 9, 2021·Chemical Society Reviews·Hang YinZongyou Yin
Jul 25, 2021·Proceedings of the National Academy of Sciences of the United States of America·Xiaobo LuDmitri K Efetov
Aug 8, 2021·Proceedings of the National Academy of Sciences of the United States of America·Tommaso Cea, Francisco Guinea
Nov 2, 2021·Advanced Science·Mengya LiuGui Yu

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