LO-Phonons and dielectric polarization effects on the electronic properties of doped GaN/InN spherical core/shell quantum dots in a nonparabolic band model

Talbi, A.; Haouari, Mohamed; Nouneh, Khalid; Pérez, Laura M.; Tiutiunnyk, A.; Laroze, David; Courel, Maykel; Feddi, E.

doi:10.1007/s00339-020-04137-6

Cited by 8 publications

(3 citation statements)

References 76 publications

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“…The strain field effect, resulting from the lattice mismatches, on CSQD has been performed in some works [48][49][50][51]. Concerning impurities confined in CSQD systems, Talbi et al have studied the effect of LO-Phonons and dielectric polarization on impurity properties in GaN/InN spherical CSQD [52]; their results show that both parameters have relatively important contributions to the impurity binding energy. El-Yadri et al have carried out the influences of temperature and pressure on single dopant states in hollow cylindrical CSQD [53]; their results demonstrate that temperature and pressure have opposite effects on impurity's photoionization cross-section and binding energy.…”

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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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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“…Studies of longitudinal optical phonons in GaAs/Al x Ga 1−x As quantum core-shell wires have shown that phonons influence the mobility of electrons, and that mobility can be achieved by core-shell wires of thicker shells (Dat and Hai, 2019). Longitudinal optical phonons have also been shown to reduce binding impurity energies in spherical core/shell quantum dots (Talbi et al, 2021). Phonon modes are influenced by topology, and the Möbius topology has been shown to give rise to phonon band gaps (Nishiguchi and Wybourne, 2018).…”

Section: Introductionmentioning

confidence: 99%

Electron-LO-phonon Intrasubband Scattering Rates in a Hollow Cylinder Under the Influence of a Uniform Axial Applied Magnetic Field

Masale

Tshipa

2021

Preprint

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Scattering rates arising from the interactions of electrons with bulk longitudinal optical (LO) phonon modes in a hollow cylinder are calculated as functions of the inner radius and the uniform axial applied magnetic field. Now, the specific nature of electron-phonon interactions mainly depends on the character of the energy spectrum of electrons. As is well known, in cylindrical quantum wires, the application of a parallel magnetic field lifts the double degeneracy of the non-zero azimuthal quantum number states; m≠0; irrespective of all electron's radial quantum number l states. In fact, this Zeeman splitting is such that the m < 0 electron's energy subbands initially decrease with the increase of the parallel applied magnetic field. In a solid cylinder, the lowest-order; {l = 1; m = 0} subband is always the ground state. In a hollow cylinder, however, as the axial applied magnetic field is increased, the electron's energy subbands take turns at becoming the ground state; following the sequence {m=0,-1,-2...-N} of azimuthal quantum numbers. Furthermore, in a hollow cylinder, in general, the electron's energy separations between any two subbands are less than the LO phonon energy except for exceptionally high magnetic fields, and some highest-order quantum number states. In view of this, the discussion of the energy relaxation here is focused mainly on intrasubband scattering of electrons and only within the lowest-order {l = 1; m = 0} electron's energy subband. The intrasubband scattering rates are found to be characterized by shallow minima in their variations with the inner radius, again, for a fixed outer radius. This feature is a consequence of a balance between two seemingly conflicting effects of the electron's confinement by the inner and outer walls of the hollow cylinder. First; increased confinement of the charge carriers generally leads to the enhancement of the rates. Second; the presence of a hole in a hollow cylinder leads to a significant suppression of the scattering rates. The intrasubband scattering rates also show a somewhat parabolic increase in their variations with the applied magnetic field; an increase which is more pronounced in a relatively thick hollow cylinder.

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“…For this reason, QDs are very important topics for researchers both theoretically and experimentally. As well as the geometric form and size of the confinement potential of QDs [4][5][6][7][8][9], the externally applied electric, magnetic and intense laser fields [10][11][12][13][14][15][16][17][18][19] affect the electronic properties, which influences the optical properties of QD. In devices based on QDs, the effects caused by impurities are also quite important and thus there are a lot of researches involving impurity-related studies with a special focus on QDs [20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Binding Energy And Absorption of Donor Impurity In Spherical GaAs/AlxGa1-x As Quantum Dots With Konwent Potential

Kasapoğlu

Sarı

et al. 2021

Preprint

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In this study, the electronic and optical properties of single or core/shell quantum dots, which are formed depending on the parameters in the selected Konwent potential, are investigated. Namely, the effects of the size and geometric shapes of quantum dots on the binding energy of the on-center donor impurity, the total absorption coefficient and refractive index which are including transitions between the some confined states, and the electromagnetically induced transparency between the lowest six confined states related to the donor impurity are investigated. We have used the diagonalization method by choosing a wave function based on the Bessel and Spherical Harmonics orthonormal function to find the eigenvalues and eigenfunctions of the electron confined within the quantum dots which have different types mentioned above. To calculate the optical absorption coefficients and electromagnetically induced transparency related to shallow-donor impurity, a two- and three-level approach in the density matrix expansion is used, respectively.

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LO-Phonons and dielectric polarization effects on the electronic properties of doped GaN/InN spherical core/shell quantum dots in a nonparabolic band model

Cited by 8 publications

References 76 publications

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

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

Electron-LO-phonon Intrasubband Scattering Rates in a Hollow Cylinder Under the Influence of a Uniform Axial Applied Magnetic Field

Binding Energy And Absorption of Donor Impurity In Spherical GaAs/AlxGa1-x As Quantum Dots With Konwent Potential

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