Faraday rotations,ellipticity,and circular dichroism in magneto-optical spectrum of moire superlattices  

作　　者：J A Crosse Pilkyung Moon 

机构地区：[1]Arts and Sciences,New York University Shanghai,Shanghai 200122,China [2]NYU-ECNU Institute of Physics at NYU Shanghai,Shanghai 200062,China [3]Department of Physics,New York University,New York 10003,USA

出　　处：《Chinese Physics B》2021年第7期18-32,共15页中国物理B（英文版）

基　　金：the National Natural Science Foundation of China(Grant Nos.12050410228 and 12074260);the Fund from the Science and Technology Commission of Shanghai Municipality,China(Grant No.19ZR1436400)。

摘　　要：We study the magneto-optical conductivity of a number of van der Waals heterostructures,namely,twisted bilayer graphene,AB–AB and AB–BA stacked twisted double bilayer graphene and monolayer graphene and AB-stacked bilayer graphene on hexagonal boron nitride.As the magnetic field increases,the absorption spectrum exhibits a self-similar recursive pattern reflecting the fractal nature of the energy spectrum.Whilst twisted bilayer graphene displays only weak circular dichroism,the other four structures display strong circular dichroism with monolayer graphene and AB-stacked bilayer graphene on hexagonal boron nitride being particularly pronounced owing to strong inversion symmetry breaking properties of the hexagonal boron nitride layer.As the left and right circularly polarized light interact with these structures differently,plane-polarized incident light undergoes a Faraday rotation and gains an ellipticity when transmitted.The size of the respective angles is on the order of a degree.

关 键 词：2D-materials van der Waals heterostructures magneto-optical conductivity graphene 

分 类 号：TQ127.11[化学工程—无机化工] O657.3[理学—分析化学]