关于Twisted Bilayer Graphene (TGB)的哈密顿量推导,可直接参看Bistritzer和MacDonald在PNAS上的原文。更详细的推导可以参照发表在Wiley Online Library上的Handbook of Graphene Set-Vol8-chapter6。(其第八卷第六章也即里斯本大学的G.Catarina的硕士毕业论文)。总得来说在写TGB的哈密顿量时,有两个关键的点,一是...
Recent advances in growth technique enable the fabrication of twisted bilayer graphene in which two layers of graphene are stacked with an arbitrary angle of in-plane rotation. The interference between two lattice periods leads to the formation of Moire pattern, creating a superlattice potential in ...
The flat band is separated from the dispersive Dirac bands, which show multiple moir茅 hybridization gaps. These data establish the salient features of the twisted bilayer graphene band structure.doi:10.1038/s41567-020-01041-xSimone LisiXiaobo Lu...
Twisted bilayer graphene is a two-dimensional moiré superlattice material formed by simple twisting of two stacked layers of graphene. This material exhibits a series of exotic physical properties dictated by the superlattice structure, such as superconducting, magnetic, and localized states. These prope...
Contrastingly, by increasing the angle, we can see that for θtbg = 2.28°, the AA bilayer graphene band structure is recovered47,48. In this particular case, the presence of hBN has the effect of opening a small gap at the Dirac cones. Fig. 2: Layer degeneracy breaking. Band ...
Our density functional theory calculations indicate that the graphene bilayer exhibits substantial out-of-plane corrugations that form a coloring-triangular structure in each moiré supercell under gradient in-plane strains. Such structure leads to a set of kagome bands, namely one flat-band and, at...
We study Dirac points of the chiral model of twisted bilayer graphene (TBG) with constant in-plane magnetic field. The striking feature of the chiral model is the presence of perfectly flat bands at magic angles of twisting. The Dirac points for zero magnetic field and non-magic angl...
moire crystalgraphenetwisted bilayermoire bandHofstadter butterflyAccording to electronic structure theory, bilayer graphene is expected to have anomalous electronic... K Kim,A Dasilva,S Huang,... - 《Proceedings of the National Academy of Sciences of the United States of America》 被引量: 29发表...
Moiré superlattices have led to observations of exotic emergent electronic properties such as superconductivity and strong correlated states in small-rotation-angle twisted bilayer graphene (tBLG)1,2. Recently, these findings have inspired the search for new properties in moiré plasmons. Although plasmo...
The electronic band structure of twisted bilayer graphene develops van Hove singularities whose energy depends on the twist angle between the two layers. Using Raman spectroscopy, we monitor the evolution of the electronic band structure upon doping using the G peak area which is enhanced when the ...