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Ascendance 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 (2021) Ascendance of Superconductivity in Magic-Angle Graphene Multilayers. . (Unpublished)

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Graphene moire superlattices have emerged as a platform hosting and abundance of correlated insulating, topological, and superconducting phases. While the origins of strong correlations and non-trivial topology are shown to be directly linked to flat moire bands, the nature and mechanism of superconductivity remain enigmatic. In particular, only alternating twisted stacking geometries of bilayer and trilayer graphene are found to exhibit robust superconductivity manifesting as zero resistance and Fraunhofer interference patterns. Here we demonstrate that magic-angle twisted tri-, quadri-, and pentalayers placed on monolayer tungsten diselenide exhibit flavour polarization and superconductivity. We also observe insulating states in the trilayer and quadrilayer arising at finite electric displacement fields, despite the presence of dispersive bands introduced by additional graphene layers. Moreover, the three multilayer geometries allow us to identify universal features in the family of graphene moire structures arising from the intricate relations between superconducting states, symmetry-breaking transitions, and van Hove singularities. Remarkably, as the number of layers increases, superconductivity emerges over a dramatically enhanced filling-factor range. In particular, in twisted pentalayers, superconductivity extends well beyond the filling of four electrons per moire unit cell, demonstrating the non-trivial role of the additional bands. Our results highlight the importance of the interplay between flat and dispersive bands in extending superconducting regions in graphene moire superlattices and open new frontiers for developing graphene-based superconductors.

Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription Paper
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
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, Stevan0000-0002-2916-360X
Additional Information:Attribution 4.0 International (CC BY 4.0). We thank Haoxin Zhou and Soudabeh Mashahadi for fruitful discussions. This work has been primarily supported by NSF-CAREER award (DMR-1753306), and Office of Naval Research (grant no. 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 no. 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 CRC 183 (project C02) of Deutsche Forschungsgemeinschaft. Author Contribution: Y.Z. and R.P. performed the measurements, fabricated the devices, and analyzed the data. Y.C. and H.K. helped with device fabrication and data analysis. C.L., A.T. and Y.P. developed theoretical models and performed calculations in close collaboration and guidance by F.v.O., G.R. and J.A. K.W. and T.T. provides hBN crystals. S.N-P. supervised the project. Y.Z., R.P., C.L., A.T., Y.P., F.v.O., G.R., J.A., and S.N-P. wrote the manuscript with the input of other authors. The authors declare no competing interests. Data availability: The data supporting the findings of this study are available from the corresponding authors on reasonable request. Code availability: All code used in modeling in this study is available from the corresponding authors on reasonable request.
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
Record Number:CaltechAUTHORS:20220113-234609742
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:112906
Deposited By: George Porter
Deposited On:14 Jan 2022 19:39
Last Modified:14 Jan 2022 19:39

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