Influence of damping on the frequency-dependent polarizabilities of doped quantum dot

•Linear and nonlinear polarizabilities of quantum dot have been investigated.•The polarizabilities are frequency-dependent.•Influence of damping has been rigorously studied.•Quantum dot is doped with a repulsive impurity.•Quantum dot is subject to external sinusoidal field.

We investigate the profiles of diagonal components of frequency-dependent linear (αxxαxx and αyyαyy), and first nonlinear (βxxxβxxx and βyyyβyyy) optical response of repulsive impurity doped quantum dots. The dopant impurity potential chosen assumes Gaussian form. The study principally focuses on investigating the role of damping on the polarizability components. In view of this the dopant is considered to be propagating under damped condition which is otherwise linear inherently. The frequency-dependent polarizabilities are then analyzed by placing the doped dot to a periodically oscillating external electric field of given intensity. The damping strength, in conjunction with external oscillation frequency and confinement potentials, fabricate the polarizability components in a fascinating manner which is adorned with emergence of maximization, minimization, and saturation. The discrimination in the values of the polarizability components in x and y-directions has also been addressed in the present context.

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