Excitations in doped quantum dot induced by accelerating impurity center

Datta, Nirmal Kr; Ghosh, Manas

doi:10.1063/1.3624664

Cited by 6 publications

(5 citation statements)

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“…In consequence, the quantity R ex (t) = dQ/dt serves as the time-dependent rate of excitation from which the time-average rate of excitation [⟨R ex ⟩ = 1 / T ∫ 0 T R ex (t)dt] can be calculated where T is the total time of dynamic evolution. 28,29,33,52 III. RESULTS AND DISCUSSION It can be unambiguously conceived that the excitation rate is controlled by the interplay between several factors of different characteristics.…”

Section: Methodsmentioning

confidence: 99%

“…The time-independent Schrödinger equation has been solved using variational method expressing the trial wave function ψ( x , y ) as a superposition of the product of harmonic oscillator eigenfunctions. ,, In the linear variational calculation, an appreciably large number of basis functions have been exploited after making the required convergence test. The general expressions for the matrix elements of H 0 ′ and V imp are given in refs , , and .…”

Section: Methodsmentioning

confidence: 99%

“…Naturally, the quantity Q ( t ) = 1– P 0 ( t ) serves as a measure of excitation. In consequence, the quantity R ex ( t ) = d Q /d t serves as the time-dependent rate of excitation from which the time-average rate of excitation [⟨ R e x ⟩ = 1 / T ∫ 0 T R ex ( t )d t ] can be calculated where T is the total time of dynamic evolution. ,,, …”

Section: Methodsmentioning

confidence: 99%

“…In their work, the impurity profiles in low-dimensional structures were regulated by an external parabolic potential defined by a variety of gate arrangements, and they maintained impurity profiles of typical Gaussian shape. Later we further improved our previous theoretical framework , by incorporating time-dependent alteration in the spatial stretch of the dopant associated with its drift …”

Section: Introductionmentioning

confidence: 99%

“…Of late, we have investigated the salient features of excitation in doped QDs which is induced by a time-dependent propagation of the dopant coordinate. , Such time-dependent propagation of dopant site signals close correlation with impurity drift in semiconductor nanodevices. The said study has attracted a great deal of interest, as most low-dimensional structures contain doped regions.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Damped Propagation of Dopant on the Excitation Kinetics of Doped Quantum Dots

Pal¹,

Datta²,

Ghosh

2013

J. Phys. Chem. C

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Excitation in quantum dots is a hotly pursued phenomenon. Realizing it, we investigate the excitation kinetics of a repulsive impurity doped quantum dot as the dopant is propagating. Such a propagation is assumed to be important because of its close connection with impurity drift in nanodevices. The problem has been made more realistic by considering the dopant propagation to be damped. For simplicity, we have considered an inherently linear propagation of the dopant, and the impurity potential has been assumed to have a Gaussian nature. The damping strength and the initial spatial stretch of the dopant have been found to fabricate the said kinetics in a delicate way. However, in the overdamped region, we find attainment of stabilization in the excitation rate invariably. Determination of average accelerating force imparted onto the propagating dopant seems to consolidate the findings. The present investigation is believed to provide some useful insight into the phenomenon of damping that has potential importance in nanoelectronic applications.

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Section: Methodsmentioning

confidence: 99%