Browsing by Author "Kasapoglu, E."
Now showing items 41-60 of 105
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The effects of the electric and magnetic fields on the nonlinear optical properties in the step-like asymmetric quantum well
Kasapoglu, E.; Ungan, F.; Duque, C. A.; Yesilgul, U.; Mora-Ramos, M. E.; Sari, H.; Sokmen, I. (ELSEVIER SCIENCE BV, 2014)In the present work, total optical absorption coefficient (the linear and third-order nonlinear) and total refractive index change for transition between two first lower-lying electronic levels in the step-like GaAs/Ga1-xAlxAs ... -
The effects of the intense laser field on bound states in GaxIn1-x NyAs1-y/GaAs single quantum well
Ungan, F.; Kasapoglu, E.; Duque, C. A.; Yesilgul, U.; Sakiroglu, S.; Sokmen, I. (SPRINGER, 2011)We have investigated the effects of the intense laser field and nitrogen concentration on bound state energy levels in Ga (x) In1- (x) N (y) As1- (y) N/GaAs quantum well. The results show that both intense laser field and ... -
The effects of the intense laser field on donor impurities in a cylindrical GaxIn1-xNyAs1-y/GaAs quantum dot under the electric field
Kasapoglu, E.; Duque, C. A.; Sakiroglu, S.; Sari, H.; Sokmen, I. (ELSEVIER SCIENCE BV, 2011)For different nitrogen and indium concentrations, intense laser field (ILF) effect on donor impurity binding energy in a cylindrical GaxIn1-xNyAs1-y/GaAs quantum dot (QD) has been studied. Results show that ILF creates an ... -
The effects of the intense laser field on the nonlinear optical properties of a cylindrical Ga1-xAlxAs/GaAs quantum dot under applied electric field
Kasapoglu, E.; Duque, C. A.; Mora-Ramos, M. E.; Sokmen, I. (ELSEVIER SCIENCE BV, 2015)In the present work, the effects of the intense laser field on total optical absorption coefficient (the linear and third-order nonlinear) and total refractive index change (the linear and third-order nonlinear) for ... -
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 ... -
Electric and magnetic field modulated energy dispersion, conductivity and optical response in double quantum wire with spin-orbit interactions
Karaaslan, Y.; Gisi, B.; Sakiroglu, S.; Kasapoglu, E.; Sari, H.; Sokmen, I. (ELSEVIER SCIENCE BV, 2018)We study the influence of electric field on the electronic energy band structure, zero-temperature ballistic conductivity and optical properties of double quantum wire. System described by double well anharmonic confinement ... -
The electric field dependence of the photoionization cross-section of shallow donor impurities in quantum dots: Infinite and finite model
Kasapoglu, E.; Sari, H.; Yesilgul, U.; Sokmen, O. (WORLD SCIENTIFIC PUBL CO PTE LTD, 2006)Using a variational approach, we have calculated the photo-ionization cross-section of a shallow donor impurity in a quantum dot with finite and infinite potential barriers in the presence of an electric field as a function ... -
Electron Raman scattering in a double quantum well tuned by an external nonresonant intense laser field
Tiutiunnyk, A.; Mora-Ramos, M. E.; Morales, A. L.; Duque, C. M.; Restrepo, R. L.; Ungan, F.; Martinez-Orozco, J. C.; Kasapoglu, E.; Duque, C. A. (ELSEVIER SCIENCE BV, 2017)In this work we shall present a study of inelastic light scattering involving inter-subband electron transitions in coupled GaAs-(Ga,AI)As quantum wells. Calculations include the electron related Raman differential cross ... -
Electron-related nonlinearities in GaAs-Ga1-xAlxAs double quantum wells under the effects of intense laser field and applied electric field
Mora-Ramos, M. E.; Duque, C. A.; Kasapoglu, E.; Sari, H.; Sokmen, I. (ELSEVIER SCIENCE BV, 2013)The combined effects of intense laser radiation and applied electric fields on the intersubband-related linear and nonlinear optical properties in GaAs-based quantum wells are discussed. It is shown that for asymmetric ... -
Electron-related optical responses in Gaussian potential quantum wells: Role of intense laser field
Sari, H.; Ungan, F.; Sakiroglu, S.; Yesilgul, U.; Kasapoglu, E.; Sokmen, I. (ELSEVIER SCIENCE BV, 2018)A theoretical study of the effects of non-resonant intense laser field on the optical response in a Gaussian potential quantum well is performed in the framework of the effective mass approximation. The obtained results ... -
Electron-related optical responses in triangular quantum dots
Tiutiunnyk, A.; Tulupenko, Y.; Mora-Ramos, M. E.; Kasapoglu, E.; Ungan, F.; Sari, H.; Sokmen, I.; Duque, C. A. (ELSEVIER SCIENCE BV, 2014)The linear and nonlinear coefficients for the optical absorption and relative refractive index change associated with intersubband transitions of electrons in the conduction band of a two-dimensional quantum dot of triangular ... -
Electron-related optical responses in triple delta-doped quantum wells
Ungan, F.; Mora-Ramos, M. E.; Kasapoglu, E.; Sari, H.; Sokmen, I. (TAYLOR & FRANCIS LTD, 2019)A detailed theoretical study on the electron-related optical responses in triple delta-doped GaAs quantum wells in the presence of non-resonant, monochromatic intense laser field is presented. For this purpose, we first ... -
Electronic band structure of GaAs/AlxGa1-xAs superlattice in an intense laser field
Sakiroglu, S.; Yesilgul, U.; Ungan, F.; Duque, C. A.; Kasapoglu, E.; Sari, H.; Sokmen, I. (ELSEVIER SCIENCE BV, 2012)We perform theoretical calculations for the band structure of semiconductor superlattice under intense high-frequency laser field. In the frame of the non-perturbative approach, the laser effects are included via laser-dressed ... -
Electronic states in GaAs-(Al, Ga) As eccentric quantum rings under nonresonant intense laser and magnetic fields
Vinasco, J. A.; Radu, A.; Niculescu, E.; Mora-Ramos, E.; Feddi, E.; Tulupenko, V.; Restrepo, R. L.; Kasapoglu, E.; Morales, A. L.; Duque, C. A. (NATURE PUBLISHING GROUP, 2019)The features of the electron energy spectrum in eccentric two-dimensional GaAs-AlGaAs quantum rings of circular shape are theoretically investigated taking into account the effect of externally applied magnetic and intense ... -
ELECTRONIC STRUCTURE AND BAND BENDING OF MODULATION-DOPED GaAs/Al-x Ga1-xAs SYMMETRIC AND ASYMMETRIC DOUBLE QUANTUM WELLS UNDER AN APPLIED ELECTRIC FIELD
Ungan, F.; Kasapoglu, E.; Sari, H.; Sokmen, I. (WORLD SCIENTIFIC PUBL CO PTE LTD, 2009)In this study, we have calculated theoretically the effects of the electric field and doping concentration on the sub-band energies, the electron population, and total charge density in modulation-doped symmetric and ... -
Electronic structure and optical properties of triangular GaAs/AlGaAs quantum dots: Exciton and impurity states
Tiutiunnyk, A.; Akimov, V.; Tulupenko, V.; Mora-Ramos, M. E.; Kasapoglu, E.; Ungan, F.; Sokmen, I.; Morales, A. L.; Duque, C. A. (ELSEVIER SCIENCE BV, 2016)Electronic structure and optical properties in equilateral triangular GaAs/Al0.3Ga0.7As quantum dots are studied extensively. The effects of donor and acceptor impurity atoms positioned in the orthocenter of the triangle, ... -
FINITE ELEMENT ANALYSIS OF VALENCE BAND STRUCTURE OF SQUARE QUANTUM WELL UNDER THE ELECTRIC FIELD
Gunes, M.; Kasapoglu, E.; Sari, H.; Akgungor, K.; Sokmen, I. (WORLD SCIENTIFIC PUBL CO PTE LTD, 2009)Valence band structure with spin-orbit (SO) coupling of GaAs/Ga1-xAlxAs square quantum well (SQW) under the electric field by a calculation procedure based on a finite element method (FEM) is investigated using the multiband ... -
Hydrogenic impurities in quantum dots under intense high-frequency laser field
Yesilgul, U.; Sakiroglu, S.; Kasapoglu, E.; Sari, H.; Soekmen, I. (ELSEVIER SCIENCE BV, 2011)The effects of intense high-frequency laser field on photoionization cross-section and binding energy of shallow-donor impurities in GaAs/GaAlAs quantum dots are calculated using variational method with the effective-mass ... -
The hydrostatic pressure and temperature effects on donor impurities in cylindrical quantum wire under the magnetic field
Kasapoglu, E.; Ungan, F.; Sari, H.; Sokmen, I. (ELSEVIER SCIENCE BV, 2010)The combined effects of hydrostatic pressure and temperature on donor impurity binding energy in cylindrical GaAs/Ga(0.7)Al(0.3)As quantum wire in the presence of the magnetic field have been studied by using a variational ... -
The hydrostatic pressure and temperature effects on donor impurities in GaAs/Ga1-xAlxAs double quantum well under the external fields
Kasapoglu, E. (ELSEVIER SCIENCE BV, 2008)The combined effects of hydrostatic pressure and temperature on donor impurity binding energy in GaAs/Ga0.7Al0.3As double quantum well in the presence of the electric and magnetic fields which are applied along the growth ...