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Promotion of superconductivity in magic-angle graphene multilayers

Zhang, Yiran and Polski, Robert and Lewandowski, Cyprian and Thomson, Alex and Peng, Yang and Choi, Youngjoon and Kim, Hyunjin and Watanabe, Kenji and Taniguchi, Takashi and Alicea, Jason and von Oppen, Felix and Refael, Gil and Nadj-Perge, Stevan (2022) Promotion of superconductivity in magic-angle graphene multilayers. Science, 377 (6614). pp. 1538-1543. ISSN 0036-8075. doi:10.1126/science.abn8585.

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Graphene moiré superlattices show an abundance of correlated insulating, topological, and superconducting phases. Whereas the origins of strong correlations and nontrivial topology can be directly linked to flat bands, the nature of superconductivity remains enigmatic. We demonstrate that magic-angle devices made of twisted tri-, quadri-, and pentalayer graphene placed on monolayer tungsten diselenide exhibit flavor polarization and superconductivity. We also observe insulating states in the tril- and quadrilayer arising at finite electric displacement fields. As the number of layers increases, superconductivity emerges over an enhanced filling-factor range, and in the pentalayer it extends well beyond the filling of four electrons per moiré unit cell. Our results highlight the role of the interplay between flat and more dispersive bands in extending superconducting regions in graphene moiré superlattices.

Item Type:Article
Related URLs:
URLURL TypeDescription
Zhang, Yiran0000-0002-8477-0074
Polski, Robert0000-0003-0887-8099
Lewandowski, Cyprian0000-0002-6944-9805
Thomson, Alex0000-0002-9938-5048
Peng, Yang0000-0002-8868-2928
Choi, Youngjoon0000-0001-9783-5992
Kim, Hyunjin0000-0001-9886-0487
Watanabe, Kenji0000-0003-3701-8119
Taniguchi, Takashi0000-0002-1467-3105
Alicea, Jason0000-0001-9979-3423
von Oppen, Felix0000-0002-2537-7256
Nadj-Perge, Stevan0000-0002-2394-9070
Additional Information:This work has been primarily supported by NSF-CAREER award (DMR-1753306), Office of Naval Research (grant N142112635), and Army Research Office under Grant Award W911NF17-1-0323. Nanofabrication efforts have been in part supported by Department of Energy DOE-QIS program (DE-SC0019166). S.N-P. acknowledges support from the Sloan Foundation (grant FG-2020-13716). G.R., J.A., and S.N.-P. also acknowledge support of the Institute for Quantum Information and Matter, an NSF Physics Frontiers Center with support of the Gordon and Betty Moore Foundation through Grant GBMF1250. C.L. acknowledges support from the Gordon and Betty Moore Foundation’s EPiQS Initiative, grant GBMF8682. Y.P. acknowledges support from the startup fund from California State University, Northridge. F.v.O. is supported by Deutsche Forschungsgemeinschaft within CRC 183 (project C02) as well as the project TWISTGRAPH.
Group:Institute for Quantum Information and Matter
Funding AgencyGrant Number
Office of Naval Research (ONR)N142112635
Army Research Office (ARO)W911NF17-1-0323
Department of Energy (DOE)DE-SC0019166
Alfred P. Sloan FoundationFG-2020-13716
Institute for Quantum Information and Matter (IQIM)UNSPECIFIED
Gordon and Betty Moore FoundationGBMF1250
Gordon and Betty Moore FoundationGBMF8682
California State University, NorthridgeUNSPECIFIED
Deutsche Forschungsgemeinschaft (DFG)CRC 183
Issue or Number:6614
Record Number:CaltechAUTHORS:20221215-427737300.1
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:118383
Deposited By: Research Services Depository
Deposited On:19 Jan 2023 17:57
Last Modified:19 Jan 2023 17:57

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