scholarly journals Impurity Modulated Static Linear and First Nonlinear Polarizabilities of Doped Quantum Dots

ISRN Optics ◽  
2012 ◽  
Vol 2012 ◽  
pp. 1-8
Author(s):  
Nirmal Kr Datta ◽  
Manas Ghosh
Keyword(s):  
Quantum Dots ◽  
Transverse Magnetic ◽  
Two Dimensions ◽  
Gaussian Form ◽  
Optical Responses ◽  
Doped Quantum Dots ◽  
Harmonic Confinement ◽  
Dopant Impurity ◽  
Impurity Doped ◽  
Dopant Location

We explore the pattern of linear and first nonlinear optical (NLO) response of repulsive impurity doped quantum dots harmonically confined in two dimensions. The dopant impurity potential chosen assumes Gaussian form. The quantum dot is subject to a static electric field. For some fixed values of transverse magnetic field strength (ωc), and harmonic confinement potential (ω0), the influence of impurity strength (V0), impurity stretch (ξ), and impurity location (r0) on the diagonal components of static linear (αxx and αyy), and the first NLO (βxxx and βyyy) responses of the dot are computed through linear variational route. The investigation reveals the crucial roles played by the various impurity parameters in modulating these optical responses. Interestingly, maximization in the first NLO responses has been observed for some particular dopant location and at some particular value of spatial stretch of the dopant.

scholarly journals Influence of Oscillatory Impurity Potential and Concurrent Gasping of Impurity Spread on Excitation Profile of Doped Quantum Dots

2013 ◽  
Vol 2013 ◽  
pp. 1-7
Author(s):  
Suvajit Pal ◽  
Manas Ghosh
Keyword(s):  
Quantum Dots ◽  
Threshold Value ◽  
Excitation Process ◽  
Excitation Rate ◽  
Impurity Potential ◽  
Dopant Incorporation ◽  
Excitation Profile ◽  
Doped Quantum Dots ◽  
Impurity Doped ◽  
Dopant Location

Excitation in quantum dots is an important phenomenon. Realizing the importance we investigate the excitation behavior of a repulsive impurity-doped quantum dot induced by simultaneous oscillations of impurity potential and spatial stretch of impurity domain. The impurity potential has been assumed to have a Gaussian nature. The ratio of two oscillations (η) has been exploited to understand the nature of excitation rate. Indeed it has been found that the said ratio could fabricate the excitation in a remarkable way. The present study also indicates attainment of stabilization in the excitation rate as soon as η surpasses a threshold value regardless of the dopant location. However, within the stabilization zone we also observe maximization in the excitation rate at some typical location of dopant incorporation. The critical analysis of pertinent impurity parameters provides important perception about the physics behind the excitation process.

Modulation of static dipole polarizability of impurity doped quantum dots in presence of noise

2018 ◽  
Vol 742 ◽  
pp. 142-150
Author(s):  
Aindrila Bera ◽  
Anuja Ghosh ◽  
Surajit Saha ◽  
Sk. Md. Arif ◽  
Manas Ghosh
Keyword(s):  
Quantum Dots ◽  
Dipole Polarizability ◽  
Doped Quantum Dots ◽  
Impurity Doped
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