4:00 PM - 6:00 PM [18p-PB4-11] Characterization of Carrier Recombination Levels in Nitrogen δ-Doped GaAs Superlattices by Two- Wavelength Excited Photoluminescence Method 〇Kota Nagata1, Kamata Norihiko1, Yagi Syuuhei1, Yaguchi Hiroyuki1 (1.Saitama Univ.)