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Electronic correlations in twisted bilayer graphene near the magic angle

Choi, Youngjoon and Kemmer, Jeannette and Peng, Yang and Thomson, Alex and Arora, Harpreet and Polski, Robert and Zhang, Yiran and Ren, Hechen and Alicea, Jason and Refael, Gil and von Oppen, Felix and Watanabe, Kenji and Taniguchi, Takashi and Nadj-Perge, Stevan (2019) Electronic correlations in twisted bilayer graphene near the magic angle. Nature Physics . ISSN 1745-2473. (In Press)

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Twisted bilayer graphene with a twist angle of around 1.1° features a pair of isolated flat electronic bands and forms a platform for investigating strongly correlated electrons. Here, we use scanning tunnelling microscopy to probe the local properties of highly tunable twisted bilayer graphene devices and show that the flat bands deform when aligned with the Fermi level. When the bands are half-filled, we observe the development of gaps originating from correlated insulating states. Near charge neutrality, we find a previously unidentified correlated regime featuring an enhanced splitting of the flat bands. We describe this within a microscopic model that predicts a strong tendency towards nematic ordering. Our results provide insights into symmetry-breaking correlation effects and highlight the importance of electronic interactions for all filling fractions in twisted bilayer graphene.

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URLURL TypeDescription ReadCube access Paper
Zhang, Yiran0000-0002-8477-0074
Watanabe, Kenji0000-0003-3701-8119
Nadj-Perge, Stevan0000-0002-2916-360X
Alternate Title:Imaging Electronic Correlations in Twisted Bilayer Graphene near the Magic Angle
Additional Information:© 2019 Springer Nature Publishing AG. Received 28 January 2019; Accepted 26 June 2019; Published 05 August 2019. Data availability: The experimental data and analyses that support the plots within this paper and the findings of this study are available from the corresponding author upon reasonable request. Code availability: The computer codes that support the plots within this paper and the findings of this study are available from the corresponding author upon reasonable request. We gratefully acknowledge discussions with R. C. Ashoori, P. Jarillo-Herrero, A. Vishwanath, J. Eisenstein, A. Young and H. Beidenkopf. The STM work is in part supported by NSF DMR-1744011. Sample fabrication efforts are supported by the NSF through program NSF CAREER DMR-1753306. S.N.-P. acknowledges support from a KNI-Weathley fellowship. J.A., G.R., F.v.O., S.N.-P. and H.R. acknowledge the support of IQIM (NSF funded physics frontiers center). J.K. acknowledges support from the Deutsche Forschungsgemeinschaft (DFG 406557161), Y.C. a Kwanjeong fellowship, F.v.O. DFG support through CRC 183, and J.A. support from the NSF through grant DMR-1723367. Y.P., A.T. and J.A. are grateful for support from the Walter Burke Institute for Theoretical Physics at Caltech. Author Contributions: Y.C., J.K. and S.N.-P. conceived the experiment. Y.C. and J.K. performed the measurements. Y.C. made the samples with the help of H.A., R.P. and Y.Z. Y.C., J.K., H.R. and S.N.-P. performed data analysis. Y.P. and A.T. developed the theory guided by F.v.O., J.A. and G.R. Y.C., J.K. and S.N.-P. wrote the manuscript with input from all authors. The authors declare no competing interests.
Group:IQIM, Institute for Quantum Information and Matter, Kavli Nanoscience Institute
Funding AgencyGrant Number
Kavli Nanoscience InstituteUNSPECIFIED
Institute for Quantum Information and Matter (IQIM)UNSPECIFIED
Deutsche Forschungsgemeinschaft (DFG)406557161
Kwanjeong Educational FoundationUNSPECIFIED
Deutsche Forschungsgemeinschaft (DFG)CRC 183
Record Number:CaltechAUTHORS:20190426-084652512
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95011
Deposited By: Tony Diaz
Deposited On:26 Apr 2019 16:11
Last Modified:05 Aug 2019 18:49

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