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
• 来源期刊: 物理学前沿
• 年，卷（期）: 2021,（1）
• 所属期刊栏目: Special Collection:Heterojunction and Its Applications(Ed.Changhua Sun)
• 页码范围: 17-22
• 页数: 6页
• 语种: 英文

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-Ⅱ band 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.