Donor dynamics of reverse type I core/shell nanostructure embedded in inorganic and organic polymer matrices

Balakrishnan, Arsha; Ganesan, Vignesh; Nithiananthi, P.

doi:10.1007/s11051-023-05809-z

J Nanopart Res

2023

DOI: 10.1007/s11051-023-05809-z

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Donor dynamics of reverse type I core/shell nanostructure embedded in inorganic and organic polymer matrices

Arsha Balakrishnan

Vignesh Ganesan²,

P. Nithiananthi

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Cited by 2 publications

References 39 publications

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On the semiconductor to metal transition in a quantum wire: Influence of geometry and laser

Vignesh,

Balaji,

Mahalakshmi

et al. 2023

Mod. Phys. Lett. B

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The diamagnetic susceptibility and binding energy (BE) of a hydrogenic donor confined in a GaAs/AlGaAs QWW were theoretically studied in this paper under the influences of the applied laser field, QWW geometry, and non-parabolicity using variation technique combined with effective mass approximation. In the first part, the diamagnetic susceptibility and BE of the donor at the ground state are studied as a function of the size of the QWW, geometry, and applied laser field. The results reveal that changing the geometry of QWW enhances the quantum confinement effects. However, increasing the laser field reduces the BE by adding screening effects to the Coulomb interactions. Further, the diamagnetic susceptibility is available with the stability information about the carrier–parent donor system based on the mean square separation between them. It also demonstrates that susceptibility may remain stable regardless of the change in geometry and applied laser field. Thus, the diamagnetic behavior can serve as a better tool to evaluate the stability and Mott transition of donors in QWW. In the second section, the consequences of laser field and geometry on the SMT of confined donors in QWW have been studied. It is observed that the BE of donors remains constant until [Formula: see text] cm[Formula: see text] beyond which it starts to decrease gradually and vanishes exactly at critical concentration ([Formula: see text]. However, the diamagnetic susceptibility of the donor has remained constant until reaching [Formula: see text], beyond which it turned into a drastic fall, which manifested the SMT in the system. The current work is expected to add a few noteworthy points to the SMT phenomena in nanostructures.

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On the semiconductor to metal transition in a quantum wire: Influence of geometry and laser

Vignesh,

Balaji,

Mahalakshmi

et al. 2023

Mod. Phys. Lett. B

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The influence of screening function on exciton mott transition in an asymmetric double quantum well

Nithiananthi,

Vignesh

2023

Mod. Phys. Lett. B

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The semiconductor-to-metal transition (SMT) due to excitons exciton mott transition (EMT) in GaAs/Al[Formula: see text]Ga[Formula: see text]As asymmetric double quantum well (ADQW) has been studied theoretically by tuning direct (DX) and indirect (IDX) exciton densities using variation technique combined with the Monte Carlo approximation. The interaction of the optically pumped exciton densities is accounted for through the Thomas–Fermi (TF) dielectric screening and compared with Hartree–Fock (HF) screening. The screening effects of IDX at the barrier regime have been accounted for through size-dependent screening. The important characteristics of EMT, such as (i). binding energy and (ii), diamagnetic susceptibility have been studied in both coupled ([Formula: see text]Å) and isolated ([Formula: see text]Å) regimes of ADQW. The effect of asymmetry on the EMT of DX (IDX) is significant only for [Formula: see text] in the case of the coupled regime of ADQW, which may be due to the dynamic tunneling mechanism. The impact of the screening among the exciton densities to bring out the avalanche breakdown of excitons at the critical concentration has been studied for different kinds of excitons.

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Donor dynamics of reverse type I core/shell nanostructure embedded in inorganic and organic polymer matrices

Cited by 2 publications

References 39 publications

On the semiconductor to metal transition in a quantum wire: Influence of geometry and laser

On the semiconductor to metal transition in a quantum wire: Influence of geometry and laser

The influence of screening function on exciton mott transition in an asymmetric double quantum well

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