Tight-binding analysis on exciton binding energy in field-induced Stark-localized superlattices

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Abstract
We use a variational calculation to study the excitonic behavior in a multiwell system. With several approximations, the exciton binding energy problem is reduced to a simple form, and the exciton binding energy is found to vary quadratically with the electron wave function confinement factor in the well with localized holes. This simple model is applied to explain quantitatively the localized exciton binding energy in a Stark-localized superlattice. It is found that a 50% electron wave function confinement factor is necessary to provide a strong excitonic effect in a multiwell system.