Tuning diagonal components of static linear and first nonlinear polarizabilities of doped quantum dots by Gaussian white noise

•Linear and first nonlinear polarizabilities of quantum dot are studied.•Quantum dot is doped with a repulsive impurity.•Doped system is subject to Gaussian white noise.•Noise affects polarizability prominently.•Dopant site also affects polarizability.

We investigate the modulation of diagonal components of static linear (αxx, αyy) and first nonlinear (βxxx, βyyy) polarizabilities of quantum dots by Gaussian white noise. Quantum dot is doped with impurity represented by a Gaussian potential and repulsive in nature. The study reveals the importance of mode of application of noise (additive/multiplicative) on the polarizability components. The doped system is further exposed to a static external electric field of given intensity. As important observation we have found that the strength of additive noise becomes unable to influence the polarizability components. However, the multiplicative noise influences them conspicuously and gives rise to additional interesting features. Multiplicative noise even enhances the magnitude of the polarizability components immensely. The present investigation deems importance in view of the fact that noise seriously affects the optical properties of doped quantum dot devices.

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