Indirect to direct exciton transition by laser irradiance in a type II core/ shell quantum dot

Balakrishnan, Arsha; Nithiananthi, P.

doi:10.1016/j.mssp.2019.104617

Cited by 11 publications

(7 citation statements)

References 14 publications

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“…N ex is the normalization constant and λ is the variational parameter. 33 Where ψ ( ) r e e and ψ ( ) r e e are the respective ground state wavefunctions of electron and hole in a reverse type I semimagnetic CSQD,…”

Section: Ex Ex E E H H E Hmentioning

confidence: 99%

Laser Dressed Magnetic Polaron In Semimagnetic Core/Shell Nanostructure

Balakrishnan

Nithiananthi

2021

ECS J. Solid State Sci. Technol.

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The combined effects of magnetic and intense laser fields on the properties of the ground state exciton in semimagnetic Cd 0.7 Mn 0.3 Te/CdTe Core/Shell Nanostructure (CSN) are analyzed using the variational method in the effective mass approximation. The magnetic field of 5 to 20 T, a laser with the frequency of 10 THz and its intensity ranging from 0.44 to 7.11 μW nm −2 are considered as external perturbing fields. The evolution of Exciton Magnetic Polaron (EMP) in response to the external fields is explored via Magnetization (M) and Zeeman energy shift (ΔE ZE ). The variation in binding energy (BE) of an exciton, M and ΔE ZE are examined for different shell widths, magnetic and laser fields. The laser-induced diamagnetism due to the dressed energy state of carriers reduces the polarization of EMP. Similarly, the external magnetic field reduces the exchange interaction between carriers and weakens EMP. The combined effect of perturbing fields on an EMP will give an insight on controlling the performance of magneto-optic devices.

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Section: Ex Ex E E H H E Hmentioning

confidence: 99%

Laser Dressed Magnetic Polaron In Semimagnetic Core/Shell Nanostructure

Balakrishnan

Nithiananthi

2021

ECS J. Solid State Sci. Technol.

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“…where E e (P, T) and E h (P, T) are the ground state energy of free electron and hole. Moreover, based on the ground state energy of exciton, their wave function, and the relation involving the mean square distance of carriers, we have studied the diamagnetic susceptibility of exciton from the Langevin theory of diamagnetism [19,26,30]: is the exciton reduced mass. All numerical results of the diamagnetic susceptibility are depicted out in atomic units where e=1, ÿ=1, m 0 =1 and c=137.…”

Section: E Xe Xe X mentioning

confidence: 99%

“…They have found that the external factors extremely affect both of the binding energy and the optical properties of the system. Anitha and Nithiananthi [19] have investigated the laser irradiance on the indirect to direct transition of exciton in a type II core/shell QND. They have come to the conclusion that the external laser perturbation plays an immense role in enhancing the device performance through stabilizing the exciton states.…”

Section: Introductionmentioning

confidence: 99%

Diamagnetic susceptibility of bound exciton in cylindrical quantum nanodots under hydrostatic pressure and temperature effects

Mommadi¹,

Moussaouy²,

Belamkadem³

2020

Phys. Scr.

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In this paper, by using the variational method and the effective mass approximation, we have studied the diamagnetic and physical properties of an exciton confined in a cylindrical quantum nanodot. Our nanosystem is under the effects of hydrostatic pressure, temperature and mixed confinement potential. The diamagnetic susceptibility, the ground state energy and the correlation energy of exciton are illustrated in various regimes. The diamagnetic susceptibility computation leads to evaluate the stability of exciton. Our findings clearly show that the diamagnetic susceptibility of the bound exciton strongly enhances with increasing the hydrostatic pressure and decreases with augmenting temperature. On the other hand, it is also remarked that the diamagnetic susceptibility increases when the nanodot size is reduced. Furthermore, it is found that the ground state energy and the Coulombic correlation are strongly affected by the effects of hydrostatic pressure and temperature. To conclude, the hydrostatic pressure and temperature perturbations play an important role to enhance the intensity of electronic and optoelectronic devices through stabilizing the excitonic state properties.

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“…Regarding the CSQD, numerous works have been devoted to these structures-either type I or type II, for CdTe/ZnS, CdTe/CdS among other materials, in recent years [30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47]. The strain field effect, resulting from the lattice mismatches, on CSQD has been performed in some works [48][49][50][51].…”

Section: Introductionmentioning

confidence: 99%

Unveiling the Role of Donor Impurity Position on the Electronic Properties in Strained Type I and Type II Core/Shell Quantum Dots under Magnetic Field

Pérez,

Aghoutane,

Laroze

et al. 2023

Materials

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In this theoretical investigation, we delve into the significant effects of donor impurity position within core/shell quantum dot structures: type I (CdTe/ZnS) and type II (CdTe/CdS). The donor impurity’s precise location within both the core and the shell regions is explored to unveil its profound influence on the electronic properties of these nanostructures. Our study investigates the diamagnetic susceptibility and binding energy of the donor impurity while considering the presence of an external magnetic field. Moreover, the lattice mismatch-induced strain between the core and shell materials is carefully examined as it profoundly influences the electronic structure of the quantum dot system. Through detailed calculations, we analyze the strain effects on the conduction and valence bands, as well as the electron and hole energy spectrum within the core/shell quantum dots. The results highlight the significance of donor impurity position as a key factor in shaping the behaviors of impurity binding energy and diamagnetic susceptibility. Furthermore, our findings shed light on the potential for tuning the electronic properties of core/shell quantum dots through precise impurity positioning and strain engineering.

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Indirect to direct exciton transition by laser irradiance in a type II core/ shell quantum dot

Cited by 11 publications

References 14 publications

Laser Dressed Magnetic Polaron In Semimagnetic Core/Shell Nanostructure

Laser Dressed Magnetic Polaron In Semimagnetic Core/Shell Nanostructure

Diamagnetic susceptibility of bound exciton in cylindrical quantum nanodots under hydrostatic pressure and temperature effects

Unveiling the Role of Donor Impurity Position on the Electronic Properties in Strained Type I and Type II Core/Shell Quantum Dots under Magnetic Field

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