Observation of Quantum Confinement Effect Away from the Zone Center in Spectroscopic Ellipsometry Study of the Dielectric Function of Single Al(0.3)Ga(0.7)As/GaAs/Al(0.3)Ga(0.7)As, Square Quantum Wells

摘要

The dielectric response of molecular-beam epitaxially grown single Al(0.3)Ga(0.7)As/GaAs/Al(0.3)Ga(0.7)As square quantum wells with thicknesses in the range 14-59 A is examined via spectroscopic ellipsometry in the energy range 1.6-5.7 eV. Shifts in the E1 transitions are observed and found to be consistent with the shifts calculated within a simple square well model with finite barrier height using appropriate L-point parameters of the bulk materials.