Formation of two-dimensional electron gas at AlGaN/GaN heterostructure and the derivation of its sheet density expression*
He Xiao-Guang, Zhao De-Gang†, Jiang De-Sheng
       
Energy band of undoped freestanding AlGaN on the assumption that the AlGaN layer is under the same tensile strain as that when growing on GaN. The polarization-induced electric field will not cause curvature of the energy band because of the lack of conductive electrons.