Hydrogenic donor impurities in $\delta$ -doped cylindrical quantum dots under intense laser field

Abstract

A theoretical study of the effects of non-resonant intense laser field on the donor impurity binding energy in a cylindrical quantum dot with δ-doped axial potential is performed in the framework of the effective mass approximation. The obtained results indicate that, 2D impurity concentration and intense laser field intensity have a significant effect on the impurity binding energy and energy levels of electrons in the cylindrical quantum dots with δ-type axial potential.

Finite difference time domain simulation of arbitrary shapes quantum dots

“…Moreover, Electronic structure of ellipsoidal and semi-ellipsoidal QDs under the influence of hydrogenic impurity and external electric field were studied a e-mail: grezaei@yu.ac.ir in [36]. Based on the effective mass approximation, Sari et al [37] studied the effects of non-resonant intense laser field on the hydrogenic impurity binding energy confined in a cylindrical QD. Using variational method, Anitha and Arulmozhi [38] investigated the influence of spatially dependent effective mass, conduction band non-parabolicity and dielectric screening function on exciton binding energy in a pyramid-shaped QD.…”

Donor impurity related optical and electronic properties of cylindrical GaAs-AlxGa1−x As quantum dots under tilted electric and magnetic fields

“…Together with the energies, they constitute the set of data necessary to study the linear and nonlinear optical properties associated with inter-level transitions. Some of the papers reported over the past two decades address issues such as: (i) the nonlinear optical rectification (NOR) and second harmonic generation (SHG) in QD with Kratzer-like potential 25 , (ii) the nonlinear optical absorption (NOA) in 4-level M-model QD 26 , (iii) the optical absorption (OA) in Morse-like QD under applied magnetic field and using a perturbative procedure 27 , (iv) the third order nonlinear optical susceptibility in InGaN/GaN QDs 28 , (v) the first and third order NOA and relative changes in the refractive index (RCRI) coefficients in CQD 29 , (vi) the impurity position dependent second order nonlinear optical susceptibility in CQD under external axial magnetic field and using a variational procedure 30 , (vii) the on-center impurity dependent NOA and RCRI coefficients in cylindrical nano-wire under combined effects of nonresonant intense laser field and axial stationary electric field and using the finite difference approximation 31 , (viii) the NOA coefficient in superlattices of spherical and cylindrical QDs immersed in a quantum wire and using the finite difference method 32 , (ix) the NOR in CQD under applied magnetic field, taking into account the Rashba spin-orbit interaction, and using a finite-difference discretization 33 , (x) the hydrostatic pressure effects on the diamagnetic susceptibility for a donor impurity confined in a CDQ under applied magnetic field 34 , and (xi) the intense laser field effects on the donor impurity binding energy in δ-doped CQD and using a variational technique 35 . In general, all of those works show that the asymmetries in the structures reinforce the dipole matrix elements and consequently the linear and nonlinear optical properties.…”