Intrinsic superflat bands in general twisted bilayer systems  

作　　者：Hongfei Wang Shaojie Ma Shuang Zhang Dangyuan Lei 

机构地区：[1]Department of Materials Science and Engineering,City University of Hong Kong,Kowloon,Hong Kong 999077,China [2]Department of Physics,University of Hong Kong,Hong Kong 999077,China [3]Department of Electrical and Electronic Engineering,University of Hong Kong,Hong Kong 999077,China

出　　处：《Light(Science & Applications)》2022年第7期1475-1481,共7页光（科学与应用)（英文版）

基　　金：supported by the Research Grants Council of Hong Kong(AoE Grant AoE/P-502/20,PDFS Gant No.PDFS2122-1504,GRF Grant No.17309021);the City University of Hong Kong(Projeat No.9610434)。

摘　　要：Twisted bilayer systems with discrete magic angles,such as twisted bilayer graphene featuring moirésuperlattices,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.

关 键 词：properties. TWISTED BANDS 

分 类 号：O15[理学—数学]