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Schematic view of intersubband transitions from the ground electronic state to the first two excited states and in a self-assembled quantum dot which is elongated along the direction. These transitions are, respectively, polarized along the long and short axes of the structure. In the spectrum at the bottom plots, the two absorption peaks, which correspond to these two polarized transitions that have respective transition energy and .
Plots of the probability densities of the three major components , , and for the ground and first two excited states in the conduction bands, , , and . Labeled in each subplot is the number of nodes in the corresponding probability density.
Ratio of intensity between the transitions from the ground electronic state to the first two excited states and , calculated as a function of the aspect ratio of the structure. The shape of the symbols correspond to the denoted structure and the solid line shows a linear fit of the result. Inset: schematic view of intersubband transitions in an isotropic quantum dot.
Component profile of the electronic states, , in an elongated dot of aspect ratio .
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