Simultaneous effects of external electric field and aluminum concentration on the binding energy of a laser-dressed donor impurity in a spherical quantum dot confined at the center of a cylindrical nano-wire

The effects of the intense laser and homogeneous electric fields on the electronic and intraband optical properties of a GaAs/Ga0.7Al0.3As quantum ring

“…In [26] the laser-field dependence of the impurity binding energy and the donorrelated photoionization cross-section in a graded quantumwell wire (QWW) under an external static electric field were calculated by a variational method and in the effective mass approximation. Based on the effective-mass approximation, the effects of external electric field and ILF on the binding energy of an on-center hydrogenic donor impurity in a spherical QD embedded in a cylindrical nano-wire was studied in [27]. Using the effective mass and parabolic band approximations and a variational procedure Duque et al calculated the combined effects of intense laser radiation, hydrostatic pressure, and applied electric field on a shallowdonor impurity states confined in cylindrical-shaped single and double GaAs/Ga −x 1 Al x As QD [28].…”

The linear and nonlinear optical properties of an off-center hydrogenic donor impurity in nanowire superlattices: Comparison between arrays of spherical and cylindrical quantum dots

“…In this regards we use the same procedure which has been applied in Ref. [33] for a single spherical QD which is located at the center of a cylindrical nanowire. In order to carry out simulation numerically, one needs to discretize Eq.…”

“…This aspect ratio ensures a sufficient convergence of solutions and should be applied to avoid achieving a huge coefficient matrix [33]. The spatial derivative is approximated by the central FD scheme for all discretized space except on boundaries and given by …”

“…For discretized space on different boundaries, different FD schemes should be applied as mentioned in Ref. [33]. After discretizing the governing equation of the model, large-scale eigenvalue problems must be solved to compute the energy levels and wave functions.…”

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

“…The dressing of the confinement and coulomb potential in a QD leads a modification of the bound energy levels, impurity binding energy and wave functions of the hydrogen like impurity-electron system under a non-resonant ILF. Safarpour et al [37] calculated the effects of external electric field and laser radiation on the binding energy and Stark shifts of electronic energy levels of a system consists of an on-center hydrogenic donor impurity in a spherical QD which is located at the center of a cylindrical nano-wire. The binding energy and Stark shifts dependencies are reported upon the electric field strength, aluminum concentration and laser radiation.…”