Interface depended electronic and magnetic properties of vertical CrI/WSe heterostructures.

Owing to the great potential applications in information processing and storage, two-dimensional (2D) magnetic materials have recently attracted significant attention. Here, using first-principles calculations, we investigate the electronic and magnetic properties of the van der Waals CrI/WSe heterostructures. We find that after forming heterostructures, monolayer CrI undergoes a direct to indirect band gap transition and its gap size is greatly reduced. In particular, the out-plane spin quantization axis of monolayer CrI is tuned into in-plane for most stacking configurations of CrI/WSe. We further reveal that the transition of the easy magnetization direction is mainly originated from the hybridization between Cr-d and Se-p orbitals. These theoretical results provide a useful picture for the electronic structure and magnetic anisotropy behaviors in vertical CrI/WSe heterostructures.