Abstract
In order to study the confined polaritons in gradual quantum structures we have calculated the exciton binding energies of parabolic and Gaussian quantum wells using a variational perturbative approach. In the linear regime, we have established, by means of the semi-classical theory, the dispersion modes of a polariton confined in quantum wells, where the confining potentials are parabolic and Gaussian. In fact, we have evaluated the oscillator strength of each quantum well in order to get an idea about the confinement size and we have concluded that the polariton is more confined in a Gaussian quantum well than in a parabolic quantum well. To make a complete description of the confined polariton we have taken into account the electron - hole exchange energy. Numerical results show that the largest effect arising from the exciton - radiation interaction is the ZT and LT splittings, which strongly depend on the quantum confinement.
Published Version
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