Effect of impurity bound polaron on optical absorption in a GaAs modified Gaussian quantum dot

Abstract

In the present work, the linear, third-order nonlinear and total optical absorption coefficients of a GaAs modified Gaussian quantum dot is investigated theoretically with considering electron longitudinal optical (LO) phonon and Coulomb impurity. We have employed the Lee–Low–Pines–Huybrecht variational method to calculate the ground and first excited states energy. The absorption coefficients calculations have also been performed by using the compact density matrix approach. Our calculations have been performed for different quantum dot sizes and various confinement potentials. The absorption coefficient resonance peaks shift toward higher energies when the LO phonon and the Coulomb potential are considered. The LO phonon interaction and the Coulomb potential have play key important in optical absorption coefficients.