Atomically thin mononitrides SiN and GeN: New two-dimensional wide band gap semiconductorsYan Qian, Zhengwei Du, Renzhu Zhu, Haiping Wu, Erjun Kan and Kaiming DengEPL, 122 4 (2018) 47002DOI: https://doi.org/10.1209/0295-5075/122/47002