Improvement of p-type conductivity in Al-rich AlGaN substituted by MgGa δ-doping (AlN)m/(GaN)n (m≥ n) superlattice - Jiang, Xinhe; Shi, Junjie; Zhang, Min; Zhong, Hongxia; Huang, Pu; Ding, Yimin; Wu, Meng; Cao, Xiong; Rong, Xin; Wang, Xinqiang (Journal of Alloys and Compounds, 2016)