Unconventional superconductivity discovered in graphene bilayers
TLDR
When two carbon sheets are misaligned by a mere degree, striking changes result as discussed by the authors, which is not the case when two carbon sheet are aligned by a simple degree, as is the case here.Abstract:
When two carbon sheets are misaligned by a mere degree, striking changes result.When two carbon sheets are misaligned by a mere degree, striking changes result.read more
Citations
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Superconductivity at 3.5 K and/or 7.2 K in potassium-doped triphenylbismuth.
TL;DR: A two-step synthesis method-ultrasound treatment and low temperature annealing and measured Raman spectra indicate that superconductivity is realized by transferring electrons from the K-4s to C-2p orbital, which opens an encouraging window for the search of organic superconductors in organometallic molecules.
Journal ArticleDOI
Twisted bilayer graphene enters a new phase
TL;DR: Improved device quality is the key to seeing a whole series of superconducting, correlated, and magnetic states in two layers of graphene assembled at a magic angle as mentioned in this paper, which is the case of our device.
Journal ArticleDOI
Revisiting the discrete planar Laplacian: exact results for the lattice Green function and continuum limit
TL;DR: In this article, the Fourier coefficients of a generalized periodic function g on a uniform infinite square lattice were analyzed and the fundamental solution of the lattice Green function (LGF) was clarified.
Journal ArticleDOI
2D Material Infrared Photonics and Plasmonics.
Ahmed Mohammed Elbanna,Hao Jiang,Qundong Fu,Juan-Feng Zhu,Yuanda Liu,Meng Zhao,Dongjue Liu,Samuel Lai,Xian Wei Chua,Jisheng Pan,Zexiang Shen,Lin Wu,Zhen Liu,Cheng-Wei Qiu,Jinghua Teng +14 more
TL;DR: A comprehensive review of the varied approaches taken to leverage the properties of the 2D materials for IR applications in photodetection and sensing, light emission and modulation, surface plasmon and phonon polaritons, nonlinear optics, and Smith-Purcell radiation, among others, is presented in this article .
Posted ContentDOI
Bereziskii-Kosterlitz-Thouless transition in the Weyl system PtBi2
Arthur Veyrat,Valentin Labracherie,Rohith Acharya,D. L. Bashlakov,Federico Caglieris,Jorge I. Facio,G. Shipunov,Lukas Graf,Johannes Schoop,Yurii Naidyuk,R. Giraud,Jeroen van den Brink,Bernd Buechner,Christian Hess,Saicharan Aswartham,Joseph Dufouleur +15 more
TL;DR: In this article, the authors reveal that broken inversion symmetry and strong spin-orbit coupling in trigonal \ce{PtBi2} lead to a Weyl semimetal band structure, with unusually robust two-dimensional superconductivity in thin fims.
References
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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.
Journal ArticleDOI
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
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
Massive Dirac Fermions and Hofstadter Butterfly in a van der Waals Heterostructure
Benjamin Hunt,Javier Sanchez-Yamagishi,Andrea Young,Matthew Yankowitz,Brian J. LeRoy,Kenji Watanabe,Takashi Taniguchi,Pilkyung Moon,Mikito Koshino,Pablo Jarillo-Herrero,Raymond Ashoori +10 more
TL;DR: Band structure engineering in a van der Waals heterostructure composed of a monolayer graphene flake coupled to a rotationally aligned hexagonal boron nitride substrate is demonstrated, resulting in an unexpectedly large band gap at charge neutrality.