Interlayer coupling effect in van der Waals heterostructures of transition metal dichalcogenides

作     者：Yuan-Yuan Wang Feng-Ping Li Wei Wei Bai-Biao Huang Ying Dai Yuan-Yuan Wang;Feng-Ping Li;Wei Wei;Bai-Biao Huang;Ying Dai

作者机构：School of PhysicsState Key Laboratory of Crystal MaterialsShandong UniversityJinan 250100China 

出 版 物：《Frontiers of physics》 (物理学前沿（英文版）)

年 卷 期：2021年第16卷第1期

页      面：17-22页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0704[理学-天文学] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China(No.51872170) Young Scholars Program of Shandong University(YSPSDU) Shandong Provincial Key Research and Development Program(Major Scientific and Technological Innovation Project)(No.2019JZZY010302) the Natural Science Foundation of Shandong Province(No.ZR2019MEM013) Taishan Scholar Program of Shandong Province. 

主　　题：van der Waals heterostructures transition metal dichalcogenides interlayer coupling effects k·p model interlayer exciton 

摘      要：Van der Waals(vdW)heterobilayers formed by two-dimensional(2D)transition metal dichalcogenides(TMDCs)created a promising platform for various electronic and optical properties,ab initio band results indicate that the band offset of type-Ⅱband alignment in TMDCs vdW heterobilayer could be tuned by introducing Janus WSSe monolayer,instead of an external electric field.On the basis of symmetry analysis,the allowed interlayer hopping channels of TMDCs vdW heterobilayer were determined,and a four-level k·p model was developed to obtain the interlayer hopping.Results indicate that the interlayer coupling strength could be tuned by interlayer electric polarization featured by various band offsets.Moreover,the difference in the formation mechanism of interlayer valley excitons in different TMDCs vdW heterobilayers with various interlayer hopping strength was also clarified.