Correlated electronic phases in twisted bilayer transition metal dichalcogenides
Lei Wang,Lei Wang,En-Min Shih,Augusto Ghiotto,Lede Xian,Daniel Rhodes,Cheng Tan,Martin Claassen,Dante M. Kennes,Dante M. Kennes,Yusong Bai,Bumho Kim,Kenji Watanabe,Takashi Taniguchi,Xiaoyang Zhu,James Hone,Angel Rubio,Angel Rubio,Abhay Pasupathy,Cory Dean +19 more
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TLDR
The observation of tunable collective phases in a simple band, which hosts only two holes per unit cell at full filling, establishes twisted bilayer transition metal dichalcogenides as an ideal platform to study correlated physics in two dimensions on a triangular lattice.Citations
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Graphene bilayers with a twist
Eva Y. Andrei,Allan H. MacDonald +1 more
TL;DR: In this article, the magic-angle twisted bilayer bilayer graphene has been shown to have properties that are sensitive to carrier density and to controllable environmental factors such as the proximity of nearby gates and twist-angle variation.
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Tunable strongly coupled superconductivity in magic-angle twisted trilayer graphene
TL;DR: In this paper, the authors show that the superconducting phase is suppressed and bounded at the Van Hove singularities that partially surround the broken-symmetry phase, which is difficult to reconcile with weak-coupling Bardeen-Cooper-Schrieffer theory.
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Correlated insulating states at fractional fillings of moiré superlattices.
Yang Xu,Song Liu,Daniel Rhodes,Kenji Watanabe,Takashi Taniguchi,James Hone,Veit Elser,Kin Fai Mak,Jie Shan +8 more
TL;DR: This study lays the groundwork for using moiré superlattices to simulate a wealth of quantum many-body problems that are described by the two-dimensional extended Hubbard model3,13,14 or spin models with long-range charge-charge and exchange interactions15,16.
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Moiré heterostructures as a condensed-matter quantum simulator
Dante M. Kennes,Dante M. Kennes,Martin Claassen,Lede Xian,Antoine Georges,Andrew J. Millis,James Hone,Cory Dean,Dimitri Basov,Abhay Pasupathy,Angel Rubio +10 more
TL;DR: In this article, the authors explore the idea of adopting twisted van der Waals heterostructures as a quantum simulation platform that enables the study of strongly correlated physics and topology in quantum materials.
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.
References
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Boron nitride substrates for high-quality graphene electronics
Cory Dean,Andrea Young,Inanc Meric,Changgu Lee,Lei Wang,Sebastian Sorgenfrei,Kenji Watanabe,Takashi Taniguchi,Philip Kim,Kenneth L. Shepard,James Hone +10 more
TL;DR: Graphene devices on h-BN substrates have mobilities and carrier inhomogeneities that are almost an order of magnitude better than devices on SiO(2).
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Metal-insulator transitions
TL;DR: A review of the metal-insulator transition can be found in this article, where a pedagogical introduction to the subject is given, as well as a comparison between experimental results and theoretical achievements.
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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.
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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: It is shown experimentally 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, and these flat bands exhibit insulating states at half-filling, which are not expected in the absence of correlations between electrons.
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One-dimensional electrical contact to a two-dimensional material.
Lei Wang,Inanc Meric,Pinshane Y. Huang,Qun Gao,Yuanda Gao,Helen Tran,Takashi Taniguchi,Kenji Watanabe,Luis M. Campos,David A. Muller,Jing Guo,Philip Kim,James Hone,Kenneth L. Shepard,Cory Dean,Cory Dean +15 more
TL;DR: In graphene heterostructures, the edge-contact geometry provides new design possibilities for multilayered structures of complimentary 2D materials, and enables high electronic performance, including low-temperature ballistic transport over distances longer than 15 micrometers, and room-tem temperature mobility comparable to the theoretical phonon-scattering limit.