Predicted septuple-atomic-layer Janus $\mathrm{MSiGe}{\mathrm{N}}_4$ (M=Mo and W) monolayers with Rashba spin splitting and high electron carrier mobilities

San-Dong Guo, Wen-Qi Mu, Yu-Tong Zhu +2

Janus two-dimensional (2D) materials have attracted much attention due to possessing unique properties caused by their out-of-plane asymmetry, which have been achieved in many 2D f…