2018
DOI: 10.1038/nature26154
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Correlated insulator behaviour at half-filling in magic-angle graphene superlattices

Abstract: A van der Waals heterostructure is a type of metamaterial that consists of vertically stacked two-dimensional building blocks held together by the van der Waals forces between the layers. This design means that the properties of van der Waals heterostructures can be engineered precisely, even more so than those of two-dimensional materials. One such property is the 'twist' angle between different layers in the heterostructure. This angle has a crucial role in the electronic properties of van der Waals heterost… Show more

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Cited by 4,291 publications
(3,956 citation statements)
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References 48 publications
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“…We now highlight an interesting finding in the experimental paper [1], whose significance may have not been fully recognized. Over a wide range of densities around charge neutrality, Landau-level degeneracy is found to be fourfold instead of eightfold, as expected from the eight degenerate massless Dirac fermions coming from graphene valley, electron spin, and ±K points of MBZ.…”
Section: Dirac Fermion Reconstruction At Charge Neutralitymentioning
confidence: 99%
See 2 more Smart Citations
“…We now highlight an interesting finding in the experimental paper [1], whose significance may have not been fully recognized. Over a wide range of densities around charge neutrality, Landau-level degeneracy is found to be fourfold instead of eightfold, as expected from the eight degenerate massless Dirac fermions coming from graphene valley, electron spin, and ±K points of MBZ.…”
Section: Dirac Fermion Reconstruction At Charge Neutralitymentioning
confidence: 99%
“…Due to the strong suppression of kinetic energy in these narrow bands, Coulomb interaction may drive correlated electron phenomena [6]. Remarkably, the recent experiments [1,2] on such twisted bilayer graphene (TBG) discovered metal-insulator transition and superconductivity at low temperature by tuning the carrier density, applying the magnetic field, or slightly varying the twist angle. These fascinating phenomena show a number of similarities with that of cuprates.…”
Section: Introductionmentioning
confidence: 99%
See 1 more Smart Citation
“…4d presents the Raman spectra of as-obtained graphene lms using different etching solutions. It clearly shows that the G band of graphene lms etched in Fe(NO 3 ) 3 and FeCl 3 is slightly upshied compared to that of the (NH 4 ) 2 S 2 O 8 sample, which is consistent with the carrier density action in Fig. 3 The relationship between (a) sheet resistance, (b) carrier mobility, and (c) carrier density of graphene films and the concentration of different acids in etching solutions; sheet resistance mapping images of 5 cm  5 cm graphene films on PET substrate using etchants consisting of (d) (NH 4 To further study the doping effect of different etchants, XPS measurements were also carried out, as shown in Fig.…”
Section: Resultsmentioning
confidence: 99%
“…2. For all samples where different etchants were used, including (NH 4 ) 2 S 2 O 8 , FeCl 3 , and Fe(NO 3 ) 3 solutions, the sheet resistance of the graphene lms gradually decreases as the concentration of etching solutions was increased. Among these three etchants, the graphene lms etched in (NH 4 ) 2 S 2 O 8 exhibited the corresponding lowest sheet resistance.…”
Section: Resultsmentioning
confidence: 99%