Elh (a) (b) Ec(z) Ev(z) PARABOLIC WELL Ece E6h 30 E5h I O 59 E 46h E3h E35h 1 68 E 24 h 1 72 E13h 50 | 46 4.52 -1.56 1.52 $.53 154 | .64 6B -1 60 1.72 PHOTON ENERGY (eV) FIGURE 4.51 (a) Parabolic potential in both conduction and valence bands grown into GaAs by a graded composition Of AlxGal x As. The band gap has been reduced in this sketch, and only heavy holes are shown. (b) Photoluminescence in parabolic wells. [From Miller et al. (1984).] CamScanner