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The binding energy of a polaron confined in a GaAs/ Ga 1 - x Al x As quantum well wire is calculated within the framework of the variational technique and Lee-Low Pines approach. The polaron-induced photoionization cross section as a function of normalized photon energy for a on-centre donor impurity in the quantum wire is investigated. The oscillator strength with the geometrical effect is studied taking into account the polaron effects in a GaAs/Ga0.8Al0.2As quantum well wire. The effect of polaron on the third-order susceptibility of third harmonic generation is studied. Our theoretical results are shown to be in good agreement with previous investigations.

Effects of Polaron and Quantum Confinement on the Nonlinear Optical Properties in a GaAs/ Ga 1 - x Al x As Quantum Well Wire