Polaron and conduction band non-parabolicity effects on the binding energy, diamagnetic susceptibility and polarizability of an impurity in quantum rings

El-Bakkari, K.; Sali, A.; Iqraoun, E.; Ezzarfi, Abdelouahid

doi:10.1016/j.spmi.2020.106729

Cited by 32 publications

(6 citation statements)

References 48 publications

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“…The reader is invited to examine the book [1] for a more detailed discussion of such properties in the QRs. Furthermore, theoretical studies of the problem of the presence of the impurity or the external fields in quantum rings and quantum dots (QDs) show the possibility of controlling the optical and electronic properties in these systems [2][3][4][5][6][7][8][9][10][11][12][13][14][15]. The combined effect of the magnetic and electric fields on the impurity confined in InAs QRs has been investigated in [2].…”

Section: Introductionmentioning

confidence: 99%

Magnetic field effect on the linear and nonlinear refractive index and optical absorption of a donor in a GaAs quantum ring

El-Bakkari¹,

Iqraoun

Jaouane³

et al. 2023

Phys. Scr.

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The effects of the magnetic field (γ), the radial position of impurity and the degree of confinement on the oscillator strength (OS), refractive index (Δn⁄n_r ) and optical absorption (α) of an impurity inside a GaAs quantum ring (QR) are explored using the effective mass approximation and variational method. It is shown that the peak position of the optical absorption and the refractive index decrease and move toward the lower incident photon energy as the strength of the γ increases. In addition, it is found that the strongest α relates to the case when the impurity is positioned at the right side of QR in the presence of the magnetic field. Our examinations also show that the oscillator strength decreases as the γ increases especially for an on-center donor impurity.

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Section: Introductionmentioning

confidence: 99%

Magnetic field effect on the linear and nonlinear refractive index and optical absorption of a donor in a GaAs quantum ring

El-Bakkari¹,

Iqraoun

Jaouane³

et al. 2023

Phys. Scr.

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“…The quantum confinement that occurs the low dimensional system, quantum well [1,2], quantum wire [3] and QDs [4] exhibited new properties, especially the QD that has natural atomic-like discrete energy levels . Their physical properties can be controlled and adjusted by changing their size and composition, in addition to a variety of shapes which can be approximated as spherical [5,6], ring [7], cubic [8,9], cylindrical [10,11], pyramid [12] and ellipsoidal [13]. The QDs have drawn the attention by many researchers in both experimental and theoretical fields [14].…”

Section: Introductionmentioning

confidence: 99%

The nonlinear optical properties of self-assembled InAs/GaAs quantum dot under effect of temperature and hydrostatic pressure

Jaouane

El-Bakkari

et al. 2023

Preprint

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In this study, we have scrutinized the influences of the temperature \(\left(T\right)\) and hydrostatic pressure \(\left(P\right)\) on the nonlinear and linear optical properties of a core/shell quantum dot (QD) system with Screened Modified Kratzer potential (SMKP). To realize this goal, we have examined the energy levels and their associated wave functions using the diagonalization method within the effective mass approximation. Analytical terms for absorption coefficients (ACs) and relative refractive index changes (RRICs) are exploited by means of the density matrix approach. The numerical outcomes are offered for typical InAs/GaAs core/shell QD system. The dependency of SMKP, dipole transition matrix element and electron energies of the ground (\(1s\)) and first excited state (\(1p\)) on the \(P\) and \(T\) that are varied over a range. Obtained numerical calculation results revealed that the \(P\) and \(T\) impacts the magnitude and position of the resonant peaks that characterize the ACs and RRICs.

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“…Although several phonon modes and their corresponding electron-phonon interactions in GaN-based nanowires (NWs) and QWRs with a circular cross section and a rectangular cross section have been widely investigated and reported, [22] the polar optical phonon modes in AlGaN QR structures with circlering cross sections have not been fully studied and understood besides some work [23][24][25] to the best of our knowledge by now. Trallero-Giner and cooperators [23] established the general expressions of electron-phonon Hamiltonian for the acoustical and optical phonon modes in semiconductor ring-like nanostructures based on a unified macroscopic continuum approach.…”

Section: Introductionmentioning

confidence: 99%

“…However, the features of phonon modes including the quasiconfined (QC) modes were not analyzed and discussed. Recently, EI‐Bakkari and co‐workers [ 25 ] numerically analyzed the binding energy of polaron in a GaN‐based QR system. Unfortunately, due to the fact that the confined phonon modes of the QR structures are absent, only a bulk longitudinal–optical (LO) phonon mode is considered in their calculations.…”

Section: Introductionmentioning

confidence: 99%

Dispersive Spectra of Phonon Modes and Fröhlich Electron–Phonon Coupling Properties in AlGaN Quantum Rings: Wurzite versus Zinc‐Blende Structure

Zhang

Shao

Pang³

2022

Physica Status Solidi (b)

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The influence of crystal structure on the phonon modes and electron–phonon coupling properties in nitride quantum ring (QR) structures is investigated based on the macroscopic dielectric continuum model. It is found that three types of phonon modes including the surface optical (SO) phonon modes, the exact confined (EC) modes, and quasiconfined (QC) modes can coexist in the wurtzite nitride QR. However, only the SO modes and EC modes may appear in zinc‐blende nitride QR, and the QC modes cannot exist in zinc‐blende QRs in general. Numerical calculation on AlN QR shows that the SO modes of zinc‐blende QR are more dispersive than those of wurtzite QR. Furthermore, the degenerative behavior of QC modes to SO modes in wurtzite QRs is clearly observed. Moreover, the electron–phonon coupling functions in zinc‐blende QRs are larger than those in wurtzite QRs. These results reveal that the crystal structures greatly affect not only the type of phonon mode, but also the coupling strength of electron–phonon interaction. The present theoretical scheme and the numerical results are quite useful and important for further understanding and investigating the polaronic effect and related physical properties in wurtzite and zinc‐blende nitride QRs.

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Polaron and conduction band non-parabolicity effects on the binding energy, diamagnetic susceptibility and polarizability of an impurity in quantum rings

Cited by 32 publications

References 48 publications

Magnetic field effect on the linear and nonlinear refractive index and optical absorption of a donor in a GaAs quantum ring

Magnetic field effect on the linear and nonlinear refractive index and optical absorption of a donor in a GaAs quantum ring

The nonlinear optical properties of self-assembled InAs/GaAs quantum dot under effect of temperature and hydrostatic pressure

Dispersive Spectra of Phonon Modes and Fröhlich Electron–Phonon Coupling Properties in AlGaN Quantum Rings: Wurzite versus Zinc‐Blende Structure

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