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    Nonlinear optical properties of n-type asymmetric double ?-doped quantum wells: role of high-frequency laser radiation, doping concentration and well width
    (Springer Heidelberg, 2020) Durmuslar, Aysevil Salman; Eduardo Mora-Ramos, Miguel; Ungan, Fatih
    A numerical investigation on the nonlinear optical rectification, second and third harmonic generation coefficients in asymmetric double n-type d-doped GaAs quantum well is performed in order to identify the influence of non-resonant intense laser radiation, doping concentration and the change in well widths. The energy eigenvalues and the corresponding eigenfunctions are determined by using effective-mass and parabolic band approximations. The working analytical expressions for the optical coefficients are derived from the iterative solving of compact-density matrix description of dielectric susceptibility. The obtained results reveal that the position and amplitude of the nonlinear optical rectification, second and third harmonic generation coefficients can be altered by modifying the external field as well as the compositional and geometrical setups.
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    Optical Absorption and Electroabsorption Related to Electronic and Single Dopant Transitions in Holey Elliptical GaAs Quantum Dots
    (WILEY-V C H VERLAG GMBH, 2018) Alejandro Vinasco, Juan; Alejandro Londono, Mauricio; Leon Restrepo, Ricardo; Eduardo Mora-Ramos, Miguel; Feddi, El Mustapha; Radu, Adrian; Kasapoglu, Esin; Luis Morales, Alvaro; Alberto Duque, Carlos
    The electron states in a holey elliptically shaped GaAs quantum dot are investigated within the effective mass scheme with the use of the adiabatic approximation and the finite element method. The effects of a donor impurity center and an applied electric field are particularly taken into account. Electron-impurity energies are reported as functions of both the geometry of the quantum dot and the applied field intensity, whereas temperature effects are also included. The analysis of electron-impurity intersubband transitions allows the investigation of the light absorption response of the system.