Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Keiji Nakamura and Masaki Takeguchi and Yoshitaka Nakano and Yoshihiro Irokawa,Band Gap States in AlGaN/GaN Hetero-Interface Studied by Deep-Level Optical Spectroscopy,MRS Proceedings,0272-9172,Springer Science and Business Media LLC,2009-01-01,1202,,,https://cir.nii.ac.jp/crid/1870302167731775232,https://doi.org/10.1557/proc-1202-i09-03