Browsing by Author "Ungan, Fatih"
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The diamagnetic susceptibilities of donors in quantum wells with anisotropic effective mass
Kasapoglu, Esin; Ungan, Fatih; Sari, Hueseyin; Soekmen, Ismail (ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD, 2009)The diamagnetic susceptibility of a hydrogenic donor placed in Si, Ge and GaAs quantum wells with infinite confinement potential which have different effective mass anisotropy parameters (gamma = m(perpendicular to)L/m(parallel ... -
The effect of magnetic field on the impurity binding energy of shallow donor impurities in a Ga1-xInxNyAs1-y/GaAs quantum well
Yesilgul, Unal; Ungan, Fatih; Sakiroglu, Serpil; Duque, Carlos; Mora-Ramos, Miguel; Kasapoglu, Esin; Sari, Huseyin; Sokmen, Ismail (SPRINGER, 2012)Using a variational approach, we have investigated the effects of the magnetic field, the impurity position, and the nitrogen and indium concentrations on impurity binding energy in a Ga1-x In (x) N (y) As1-y /GaAs quantum ... -
Effect of the High-Frequency Laser Radiation on the Nonlinear Optical Properties of n-Type Double delta-Doped GaAs Quantum Wells
Ungan, Fatih; Sari, Huseyin; Kasapoglu, Esin; Yesilgul, Unal; Sakiroglu, Serpil; Sokmen, Ismail (AMER SCIENTIFIC PUBLISHERS, 2019)In the present work, the effect of non-resonant intense laser field on the nonlinear optical rectification and second and third harmonic generation of n-type double delta-doped GaAs quantum well is studied in detail. The ... -
Effects of an intense, high-frequency laser field on bound states in Ga1-xInxNyAs1-y/GaAs double quantum well
Ungan, Fatih; Yesilgul, Unal; Sakiroglu, Serpil; Kasapoglu, Esin; Erol, Ayse; Arikan, Mehmet Cetin; Sari, Huseyin; Sokmen, Ismail (SPRINGER, 2012)Within the envelope function approach and the effective-mass approximation, we have investigated theoretically the effect of an intense, high-frequency laser field on the bound states in a Ga (x) In1 - x N (y) As1 - y /GaAs ... -
Effects of applied electric and magnetic fields on the nonlinear optical rectification and second-harmonic generation in a graded quantum well under intense laser field
Ungan, Fatih (SPRINGER, 2017)In this present study, the effects of electric and magnetic fields on the nonlinear optical rectification and second-harmonic generation in a graded quantum well under intense laser field have been investigated theoretically. ... -
The effects of the intense laser field on the optical properties of the asymmetric parabolic quantum well
Kasapoglu, E.; Ungan, Fatih; Yesilgul, Unal (SPRINGER, 2017)We have calculated the effects of the intense laser field on the total optical absorption coefficient (the linear and third-order nonlinear) for transition between two lower-lying electronic levels in the asymmetric parabolic ... -
Inter-sub-band transitions and binding energies of donor impurities in a modulation-doped quantum well in the presence of electric field
Ungan, Fatih; Kasapoglu, Esin; Sari, Hueseyin; Soekmen, Ismail (ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD, 2009)In this study, we have investigated theoretically the effects of the electric field and doping concentration on the optical transitions in a modulation-doped GaAs-AlGaAs quantum well for different well widths. The binding ... -
Nonlinear optical properties of asymmetric n-type double delta-doped GaAs quantum well under intense laser field
Sari, Huseyin; Kasapoglu, Esin; Yesilgul, Unal; Sakiroglu, Serpil; Ungan, Fatih; Sokmen, Ismail (SPRINGER, 2017)The effect of non-resonant intense laser field on the intersubband-related optical absorption coefficient and refractive index change in the asymmetric n-type double delta-doped GaAs quantum well is theoretically investigated. ... -
Tuning of nonlinear optical characteristics of a cylindrical quantum dot by external fields and structure parameters
Jaouane Mohammed; Sali Ahmed; Kasapoglu Esin; Ungan, Fatih (Taylo&Francis, 2023)In this present study, we have theoretically investigated the effect of applied external electric field and non-resonant intense laser field, as well as the adjustable physical parameters (A, M, and η) of the system, ... -
The variation of electronic properties with the doping concentration of modulation-doped AlxGa1-xAs-GaAs double quantum wells
Ungan, Fatih; Ozturk, Emine; Ergun, Yuksel; Sokmen, Ismail (ACADEMIC PRESS LTD ELSEVIER SCIENCE LTD, 2007)In this paper we have calculated the sub-band structure and the confinement potential of modulation-doped Ga1-xAlxAs-GaAs double quantum wells as a function of the doping concentration. The electronic properties of this ...