Bilayer graphene has been predicted to host a moiré miniband with flat dispersion if the layers are stacked at specific twist angles known as the ’magic angles’1,2. Recently, twisted bilayer graphene (tBLG) with a magic angle twist was reported to exhibit a correlated insulating state and...
there is always an isolated Dirac band in the alternating-twist graphene system constructed by odd number of layers.Since each pair of flat bands can be perceived as the zeroth pseudo-Landau-levels in two dimensional Dirac fermions,electron in the flat band pair can feel a pseudo-magnetic ...
The recently discovered flat electronic bands and strongly correlated and superconducting phases in magic-angle twisted bilayer graphene (MATBG)1,2 crucially depend on the interlayer twist angle, θ. Although control of the global θ with a precision of about 0.1 degrees has been demonstrated1,2,...
The discovery of flat-band unconventional superconductivity and Mott insulating behavior in twisted graphene bilayers in 2018 was a groundbreaking and highly impactful development in condensed matter physics. It generated significant attention and excitement, sparking intense research into emergent quantum ...
band engineering by twisting.Theoretical predictions followed by experimental realization of magic-angle bilayer graphene ignited the flame of investigation on the new freedom degree,twistangle,to adjust(opto)electrical behaviors.Then,the merging of Dirac cones and the presence of flat bands gave rise ...
Visualization of the flat electronic band in twisted bilayer graphene near the magic angle twistdoi:10.1038/S41567-020-0974-XM. Iqbal Bakti UtamaRoland J. KochKyunghoon LeeNicolas LeconteHongyuan LiSihan ZhaoLili JiangJiayi ZhuKenji Watanabe
Alternating twist multilayer graphene (ATMG) has recently emerged as a family of moiré systems that share several fundamental properties with twisted bilayer graphene, and are expected to host similarly strong electron–electron interactions near the magic angle. Here, we study alternating twist quadri...
During rotating, graphene’s K points will move away from MoS2’s K points; at θ = 30°, graphene’s K points are at MoS2’s Γ points due to the band folding. From K point to Γ point, there is a k-path along which MoS2’s bandgap changes from minimum to maximum. As a...
In twisted bilayer graphene, at certain twist angles, long-range periodicity associated with moiré patterns introduces flat electronic bands and highly localized electronic states, resulting in Mott insulating behaviour and superconductivity3,4. Theoretical studies suggest that these twist-induced phenomena ...
are usually characteristic of material composition. Yet van der Waals layered materials provide an efficient tuning knob: the twist angle between adjacent layers can turn the semimetal graphene into a Mott insulator1, superconductor2, or ferromagnet3; topological phases4,5,6,7, spin-pseudospin coupli...