Tunable spin-polarized correlated states in twisted double bilayer graphene
Xiaomeng Liu,Zeyu Hao,Eslam Khalaf,Jong Yeon Lee,Yuval Ronen,Hyobin Yoo,Danial Haei Najafabadi,Kenji Watanabe,Takashi Taniguchi,Ashvin Vishwanath,Philip Kim +10 more
TLDR
Twisted double bilayer graphene devices show tunable spin-polarized correlated states that are sensitive to electric and magnetic fields, providing further insights into correlated states in two-dimensional moiré materials.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.
Journal ArticleDOI
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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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.
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Electric field–tunable superconductivity in alternating-twist magic-angle trilayer graphene
Zeyu Hao,A. M. Zimmerman,Patrick J. Ledwith,Eslam Khalaf,Danial Haie Najafabadi,Kenji Watanabe,Takashi Taniguchi,Ashvin Vishwanath,Philip Kim +8 more
TL;DR: In this paper, a van der Waals (vdW) heterostructure was constructed with three graphene layers stacked with alternating twist angles ±θ at the average twist angle θ ~ 156°, a theoretically predicted "magic angle" for the formation of flat electron bands, and the authors observed displacement field-tunable superconductivity with a maximum critical temperature of 21 kelvin.
Journal ArticleDOI
Unconventional ferroelectricity in moiré heterostructures
Zhiren Zheng,Qiong Ma,Qiong Ma,Zhen Bi,Sergio C. de la Barrera,Ming-Hao Liu,Nannan Mao,Yang Zhang,Natasha Kiper,Kenji Watanabe,Takashi Taniguchi,Jing Kong,William A. Tisdale,Raymond Ashoori,Nuh Gedik,Liang Fu,Su-Yang Xu,Su-Yang Xu,Pablo Jarillo-Herrero +18 more
TL;DR: Electronic ferroelectricity is observed in a graphene-based moiré heterostructure, which is explained using a spontaneous interlayer charge-transfer model driven by layer-specific on-site Coulomb repulsion.
References
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The electronic properties of graphene
TL;DR: In this paper, the basic theoretical aspects of graphene, a one-atom-thick allotrope of carbon, with unusual two-dimensional Dirac-like electronic excitations, are discussed.
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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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Direct observation of a widely tunable bandgap in bilayer graphene
Yuanbo Zhang,Tsung-Ta Tang,Tsung-Ta Tang,Caglar Girit,Zhao Hao,Michael C. Martin,Alex Zettl,Alex Zettl,Michael F. Crommie,Michael F. Crommie,Y. Ron Shen,Y. Ron Shen,Feng Wang,Feng Wang +13 more
TL;DR: This work demonstrates a gate-controlled, continuously tunable bandgap of up to 250 meV and suggests novel nanoelectronic and nanophotonic device applications based on graphene that have eluded previous attempts.
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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.
Journal ArticleDOI
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.