Optical properties of undoped and modulation-doped AlGaN/GaN single heterostructures grown by metalorganic chemical vapor deposition - Kwon, Ho Ki; Eiting, C. J.; Lambert, D. J. H.; Shelton, B. S.; Wong, M. M.; Zhu, T. G.; Dupuis, R. D. (American Institute of Physics (AIP), 2001)
http://dx.doi.org/10.1063/1.1330767
Keywords: U