Intrinsic Superflat Bands in General Twisted Bilayer Systems
arXiv:2201.00291 · doi:10.1038/s41377-022-00838-0
Abstract
Twisted bilayer systems with discrete magic angles, such as twisted bilayer graphene featuring moiré superlattices, provide a versatile platform for exploring novel physical properties. Here, we discover a class of superflat bands in general twisted bilayer systems beyond the low-energy physics of magic-angle twisted counterparts. By considering continuous lattice dislocation, we obtain intrinsic localized states, which are spectrally isolated at lowest and highest energies and spatially centered around the AA stacked region, governed by the macroscopic effective energy potential well. Such localized states exhibit negligible inter-cell coupling and support the formation of superflat bands in a wide and continuous parameter space, which can be mimicked using a twisted bilayer nanophotonic system. Our finding suggests that general twisted bilayer systems can realize continuously tunable superflat bands and the corresponding localized states for various photonic, phononic and mechanical waves.
7 pages, 6 figures
References in corpus (9)
- Electric Field Effect in Atomically Thin Carbon Films
- Observation of Moiré Excitons in WSe2/WS2 Heterostructure Superlattices
- The electronic properties of bilayer graphene
- Evolution of Interlayer Coupling in Twisted MoS2 Bilayers
- Observation of topological polaritons and photonic magic angles in twisted van der Waals bi-layers
- Visualization of higher-order topological insulating phases in two-dimensional dielectric photonic crystals
- Twist-controlled resonant tunnelling in graphene-boron nitride-graphene heterostructures
- Superlattice-induced insulating states and valley-protected orbits in twisted bilayer graphene
- Bound States in the Continuum in Bilayer Photonic Crystal with TE-TM Cross-Coupling