Title:Dipole Moment and Polarizability of Impurity Doped GaAs Quantum Dots: Role of Noise
Volume: 6
Issue: 2
Author(s): Anuja Ghosh and Manas Ghosh*
Affiliation:
- Department of Chemistry, Physical Chemistry Section, Visva-Bharati University, Santiniketan, Birbhum-731235, West Bengal,India
Keywords:
Quantum dot, impurity, electric field, dipole moment, polarizability, Gaussian white noise.
Abstract: Background: Present study inspects the profiles of electric Dipole Moment (DPM) and polarizability
(αp) of impurity doped GaAs Quantum Dots (QDs) in the presence of noise.
Objective: Noise term maintains a Gaussian white character and it has been introduced to the system via
two different pathways; additive and multiplicative. In view of a comprehensive analysis, modulation of
DPM and αp has been scrutinized along with the variations of several relevant quantities such as electric
field, magnetic field, confinement potential, dopant location, dopant potential, noise strength and aluminium
concentration (only for AlxGa1-xAs QD).
Methods: Application of noise almost invariably reduced the magnitude of αp and DPM from that of noisefree
condition. However, the extent to which the said properties are altered depends on the noise strength
domain and the pathway through which noise is applied. It can therefore be inferred that introduction of
noise diminished the asymmetric nature of the system to a noticeable extent.
Research: Moreover, the extent of drop in the asymmetric character of the system was found to be more
with multiplicative noise than its additive analogue. Thus, the mode of application of noise also appears
important in harnessing the polarizability and dipole moment of the system.
Conclusion: The outcomes of the study delineate viable routes to tune the dipole moment and polarizability
of doped QD system, particularly in presence of noise.
