Intrinsic piezoelectricity in monolayer MSi2N4 (M = Mo, W, Cr, Ti, Zr and Hf)San-Dong Guo, Yu-Tong Zhu, Wen-Qi Mu and Wen-Cai RenEPL, 132 5 (2020) 57002DOI: https://doi.org/10.1209/0295-5075/132/57002
