Tunable moiré bands and strong correlations in small-twist-angle bilayer graphene

Abstract

Significance Accurately controlled, very long wavelength moiré patterns are realized in small-twist-angle bilayer graphene, and studied using electron transport and scanning probe microscopy. We observe gaps in electron transport at anomalous densities equal to ±8 electrons per moiré crystal unit cell, at variance with electronic structure theory, and the emergence of a Hofstadter butterfly in the energy spectrum in perpendicular magnetic fields. These findings open up an avenue to create artificial crystals by manipulating the relative angle between individual layers in a heterostructure.

Keywords

Bilayer grapheneTwistMoiré patternGrapheneMaterials scienceCondensed matter physicsBilayerOpticsPhysicsNanotechnologyGeometryMathematicsChemistryMembrane

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Publication Info

Year: 2017
Type: article
Volume: 114
Issue: 13
Pages: 3364-3369
Citations: 529
Access: Closed

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APA Style

                            
                                
                                    Kyounghwan Kim, 
                                
                                    Ashley DaSilva, 
                                
                                    Shengqiang Huang
                                
                                et al.
                            
                            (2017). 
                            Tunable moiré bands and strong correlations in small-twist-angle bilayer graphene. 
                            Proceedings of the National Academy of Sciences
                            , 114
                            (13)
                            , 3364-3369.
                            https://doi.org/10.1073/pnas.1620140114
                        

Identifiers

DOI: 10.1073/pnas.1620140114