Spectroscopy of a Tunable Moir\'e System with a Correlated and Topological Flat Band
Xiaomeng Liu,Cheng-Li Chiu,Jong Yeon Lee,Gelareh Farahi,Kenji Watanabe,Takashi Taniguchi,Ashvin Vishwanath,Ali Yazdani +7 more
Reads0
Chats0
TLDR
Gate-tuned scanning tunneling spectroscopy is used to directly demonstrate the tunability of the band structure of TDBG with an electric field and to show spectroscopic signatures of electronic correlations and topology for its flat band.Citations
More filters
Journal Article
Intrinsic Quantized Anomalous Hall Effect in a Moiré Heterostructure, Part III: Scanning Probe Magnetometry
Charles Tschirhart,Marec Serlin,Hryhoriy Polshyn,Yuxuan Zhang,Jiacheng Zhu,Leon Balents,Martin E. Huber,Kenji Watanabe,Takashi Taniguchi,Andrea Young +9 more
TL;DR: The quantum anomalous Hall (QAH) effect combines topology and magnetism to produce precisely quantized Hall resistance at zero magnetic field as discussed by the authors, which is driven by intrinsic strong interactions, which polarize the electrons into a single spin and valley-resolved moiré miniband with Chern number C = 1.
Journal Article
Charge order and broken rotational symmetry in magic-angle twisted bilayer graphene
TL;DR: When scanning tunnelling spectroscopy is used to map the electronic structure of magic-angle twisted bilayer graphene, a pseudogap phase is found, accompanied by a global charge-ordered stripe phase, which provides new evidence of a deeper link underlying the phenomenology of these systems.
Journal Article
Independent Superconductors and Correlated Insulators in Twisted Bilayer Graphene
TL;DR: In this paper, it was shown that superconductivity can exist without correlated insulating states in twisted bilayer graphene devices a little away from the magic angle, in contrast to previous claims that the two phases compete with each other.
Journal ArticleDOI
Visualizing broken symmetry and topological defects in a quantum Hall ferromagnet
TL;DR: In this article , a field-tuned continuous quantum phase transition from a valley polarized state to an intervalley coherent state, with a Kekule distortion of its electronic density, was observed.
Journal ArticleDOI
Correlated insulating phases in the twisted bilayer graphene
TL;DR: In this article, a review of analytical and numerical studies of correlated insulating states in twisted bilayer graphene, focusing on real-space lattice models constructions and their unbiased quantum many-body solutions is presented.
References
More filters
Journal ArticleDOI
Unconventional superconductivity in magic-angle graphene superlattices
Yuan Cao,Valla Fatemi,Shiang Fang,Kenji Watanabe,Takashi Taniguchi,Efthimios Kaxiras,Pablo Jarillo-Herrero +6 more
TL;DR: The realization of intrinsic unconventional superconductivity is reported—which cannot be explained by weak electron–phonon interactions—in a two-dimensional superlattice created by stacking two sheets of graphene that are twisted relative to each other by a small angle.
Journal ArticleDOI
Moiré bands in twisted double-layer graphene
TL;DR: This work addresses the electronic structure of a twisted two-layer graphene system, showing that in its continuum Dirac model the moiré pattern periodicity leads to moirÉ Bloch bands.
Journal Article
Correlated Insulator Behaviour at Half-Filling in Magic Angle Graphene Superlattices
Yuan Cao,Valla Fatemi,Ahmet Demir,Shiang Fang,Spencer Tomarken,Jason Luo,Javier Sanchez-Yamagishi,Kenji Watanabe,Takashi Taniguchi,Efthimios Kaxiras,Raymond Ashoori,Pablo Jarillo-Herrero +11 more
TL;DR: In this article, the effects of the twist angle between different layers in a van der Waals heterostructure have been investigated and it was shown that when this angle is close to the magic angle, the electronic band structure near zero Fermi energy becomes flat, owing to strong interlayer coupling.
Journal ArticleDOI
Tuning superconductivity in twisted bilayer graphene.
Matthew Yankowitz,Shaowen Chen,Hryhoriy Polshyn,Yuxuan Zhang,Kenji Watanabe,Takashi Taniguchi,David Graf,Andrea Young,Cory Dean +8 more
TL;DR: This study demonstrates twisted bilayer graphene to be a distinctively tunable platform for exploring correlated states by inducing superconductivity at a twist angle larger than 1.1°—in which correlated phases are otherwise absent—by varying the interlayer spacing with hydrostatic pressure.
Journal ArticleDOI
Flat bands in slightly twisted bilayer graphene: tight-binding calculations
TL;DR: In this article, the authors found flat bands near Fermi level in slightly twisted bilayer graphene as a signature of a transition from a parabolic dispersion to the characteristic linear dispersion of graphene.
Related Papers (5)
Intrinsic band gap and electrically tunable flat bands in twisted double bilayer graphene
Young Woo Choi,Hyoung Joon Choi +1 more
Observation of flat bands in twisted bilayer graphene
Simone Lisi,Xiaobo Lu,Tjerk Benschop,Tobias A. de Jong,Petr Stepanov,José Durán,Florian Margot,Irène Cucchi,Edoardo Cappelli,Andrew Hunter,Anna Tamai,Viktor Kandyba,Alessio Giampietri,Alexei Barinov,Johannes Jobst,Vincent Stalman,Maarten Leeuwenhoek,Maarten Leeuwenhoek,Kenji Watanabe,Takashi Taniguchi,Louk Rademaker,Sense Jan van der Molen,Milan P. Allan,Dmitri K. Efetov,Felix Baumberger,Felix Baumberger +25 more
Direct evidence for flat bands in twisted bilayer graphene from nano-ARPES
Simone Lisi,Xiaobo Lu,Tjerk Benschop,Tobias A. de Jong,Petr Stepanov,José Durán,Florian Margot,Irène Cucchi,Edoardo Cappelli,Andrew Hunter,Anna Tamai,Viktor Kandyba,Alessio Giampietri,Alexei Barinov,Johannes Jobst,Vincent Stalman,Maarten Leeuwenhoek,Kenji Watanabe,Takashi Taniguchi,Louk Rademaker,Sense Jan van der Molen,Milan P. Allan,Dmitri K. Efetov,Felix Baumberger +23 more