Quasicrystalline 30° twisted bilayer graphene: fractal patterns and electronic localization properties

The recently synthesized 30° twisted bilayer graphene (30°-TBG) systems are unique quasicrystal systems possessing dodecagonal symmetry with graphene’s relativistic properties. We employ a real-space numerical atomistic framework that respects both the dodecagonal rotational symmetry and the massles...

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Bibliographic Details
Published inFrontiers in carbon Vol. 3
Main Authors Kevin J. U. Vidarte, Caio Lewenkopf
Format Journal Article
LanguageEnglish
Published Frontiers Media S.A 05.11.2024
Subjects
electronic structure
HHK recursive technique
Landau level spectrum
quasicrystals
Stampfli tiles
twisted bilayer graphene
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Summary:The recently synthesized 30° twisted bilayer graphene (30°-TBG) systems are unique quasicrystal systems possessing dodecagonal symmetry with graphene’s relativistic properties. We employ a real-space numerical atomistic framework that respects both the dodecagonal rotational symmetry and the massless Dirac nature of the electrons to describe the local density of states of the system. The approach we employ is very efficiency for systems with very large unit cells and does not rely on periodic boundary conditions. These features allow us to address a broad class of multilayer two-dimensional crystal with incommensurate configurations, particularly TBGs. Our results reveal that the 30°-TBG electronic spectrum consist of extended states together with a set of localized wave functions. The localized states exhibit fractal patterns consistent with the quasicrystal tiling.
ISSN:2813-4192
DOI:10.3389/frcrb.2024.1496179