Layer-Dependent Interaction Effects in the Electronic Structure of Twisted Bilayer Graphene Devices

Nicholas Dale; M. Iqbal Bakti Utama; Dongkyu Lee; Nicolas Leconte; Sihan Zhao; Kyunghoon Lee; Takashi Taniguchi; Kenji Watanabe; Chris Jozwiak; Aaron Bostwick; Eli Rotenberg; Roland J. Koch; Jeil Jung; Feng Wang; Alessandra Lanzara

doi:10.1021/acs.nanolett.3c00253

論文 Layer-Dependent Interaction Effects in the Electronic Structure of Twisted Bilayer Graphene Devices

Nicholas Dale ; M. Iqbal Bakti Utama ; Dongkyu Lee ; Nicolas Leconte ; Sihan Zhao ; Kyunghoon Lee ; Takashi Taniguchi (National Institute for Materials Science) ; Kenji Watanabe (National Institute for Materials Science) ; Chris Jozwiak ; Aaron Bostwick ; Eli Rotenberg ; Roland J. Koch ; Jeil Jung ; Feng Wang ; Alessandra Lanzara

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Nicholas Dale, M. Iqbal Bakti Utama, Dongkyu Lee, Nicolas Leconte, Sihan Zhao, Kyunghoon Lee, Takashi Taniguchi, Kenji Watanabe, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg, Roland J. Koch, Jeil Jung, Feng Wang, Alessandra Lanzara. Layer-Dependent Interaction Effects in the Electronic Structure of Twisted Bilayer Graphene Devices. Nano Letters. 2023, 23 (15), 6799-6806. https://doi.org/10.1021/acs.nanolett.3c00253

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(abstract)

Near the magic angle, strong correlations drive many intriguing phases in twisted bilayer graphene (tBG) including unconventional superconductivity and chern insulation. Whether correlations can tune symmetry-breaking phases in tBG at intermediate (>2º) twist angles remains an open fun- damental question. Here, using angle resolved photoemission spectroscopy, we study the effects of many-body interactions and displacement field on the band structure of bilayer graphene field-effect devices at intermediate (3º) twist angle. We observe a layer and doping-dependent renormalization of bands at the K points that is qualitatively consistent with moir ́e models of the Hartree-Fock interaction. We provide evidence for correlation-enhanced inversion symmetry breaking, manifested by gaps at the Dirac points which are tunable with doping. These results suggest that electronic interactions play a significant role in the physics of bilayer graphene even at intermediate twist angles, and present a new pathway towards engineering band structure and symmetry-breaking phases in moiré heterostructures.

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