R. Tsu, H. Kawamura, et al.
Solid State Communications
Reflectivity measurements for a GaAs-AlAs superlattice and a Ga 0.5Al0.5As alloy were performed. Analyses of these results permit the determination of both refractive indices and absorption coefficients. The absorption edges for the alloy and superlattice are approximately 2 and 1.63 eV, respectively. A shift of 0.11 eV from the absorption edge of GaAs compares favorably with transport measurements showing that the lowest energy state in such a superlattice is about 0.1 eV above the bottom of the conduction band of GaAs.
R. Tsu, H. Kawamura, et al.
Solid State Communications
L. Esaki, L.L. Chang
Physical Review Letters
E. Mendez, G. Bastard, et al.
Physical Review B
L.L. Chang, E. Mendez, et al.
Surface Science