Browsing by Author "Sari, H."
Now showing items 41-60 of 90
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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 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 ... -
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 ... -
Fourier transform technique in variational treatment of two-electron parabolic quantum dot
Sakiroglu, S.; Yildiz, A.; Dogan, Ue.; Akgungor, K.; Epik, H.; Ergun, Y.; Sari, H.; Sokmen, I. (IOP PUBLISHING LTD, 2009)In this work, we propose an efficient method of reducing the computational effort of variational calculation with a Hylleraas-like trial wavefunction. The method consists of introducing integra transforms for the terms as ... -
Ground state energy of excitons in quantum dot treated variationally via Hylleraas-like wavefunction
Sakiroglu, S.; Dogan, Ue.; Yildiz, A.; Akgungor, K.; Epik, H.; Ergun, Y.; Sari, H.; Sokmen, I. (IOP PUBLISHING LTD, 2009)In this work, the effects of quantum confinement on the ground state energy of a correlated electron-hole pair in a spherical and in a disc-like quantum dot have been investigated as a function of quantum dot size. Under ... -
Hydrogenic donor impurities in delta-doped cylindrical quantum dots under intense laser field
Sari, H.; Ungan, F.; Sakiroglu, S.; Yesilgul, U.; Sokmen, I. (IOP PUBLISHING LTD, 2019)A theoretical study of the effects of non-resonant intense laser field on the donor impurity binding energy in a cylindrical quantum dot with delta-doped axial potential is performed in the framework of the effective mass ... -
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 ... -
Hydrostatic Pressure and Temperature Effect on the Electron-Related Optical Responses in Symmetric and Asymmetric n-Type Double Delta-Doped GaAs Quantum Well Under Terahertz Laser Field
Ungan, F.; Mora-Ramos, M. E.; Sari, H.; Sokmen, I. (SPRINGER, 2019)The effects of non-resonant intense laser fields on the intersubband-related light absorption and relative refractive index change coefficients in symmetric and asymmetric n-type double -doped GaAs quantum wells are ... -
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 ... -
Impurity-related linear and nonlinear optical response in quantum-well wires with triangular cross section
Duque, C. A.; Mora-Ramos, M. E.; Kasapoglu, E.; Ungan, F.; Yesilgul, U.; Sakiroglu, S.; Sari, H.; Sokmen, I. (ELSEVIER SCIENCE BV, 2013)The Is-like and 2p-like donor impurity energy states are studied in a semiconductor quantum wire of equilateral triangular cross section as functions of the impurity position and the geometrical size of the structure. ... -
Impurity-related optical response in cylindrical quantum dots with a delta-doped axial potential under an intense laser field
Sari, H.; Ungan, F.; Sakiroglu, S.; Yesilgul, U.; Sokmen, I. (PERGAMON-ELSEVIER SCIENCE LTD, 2018)A theoretical study of the effects of a nonresonant intense laser field on the absorption coefficients and refractive index changes for a two-level system associated with transitions from the 1S -like impurity state to the ... -
Infrared transitions between hydrogenic states in GaInNAs/GaAs quantum wells
Al, E. B.; Ungan, F.; Yesilgul, U.; Kasapoglu, E.; Sari, H.; Sokmen, I. (WORLD SCIENTIFIC PUBL CO PTE LTD, 2016)The effects of nitrogen and indium concentrations on the 1s, 2s, 2p(0) and 2p +/--like donor impurity energy states in a single Ga1-xInxNyAs1-y/GaAs quantum well (QW) are investigated by variational approach within the ... -
Intense laser effects on donor impurity in a cylindrical single and vertically coupled quantum dots under combined effects of hydrostatic pressure and applied electric field
Duque, C. A.; Kasapoglu, E.; Sakiroglu, S.; Sari, H.; Sokmen, I. (ELSEVIER SCIENCE BV, 2010)Using the effective mass and parabolic band approximations and a variational procedure we have calculated the combined effects of intense laser radiation, hydrostatic pressure, and applied electric field on shallow-donor ... -
Intense laser effects on nonlinear optical absorption and optical rectification in single quantum wells under applied electric and magnetic field
Duque, C. A.; Kasapoglu, E.; Sakiroglu, S.; Sari, H.; Sokmen, I. (ELSEVIER SCIENCE BV, 2011)In this work the effects of intense laser on the electron-related nonlinear optical absorption and nonlinear optical rectification in GaAs-Ga(1-x)Al(x)As quantum wells are studied under, applied electric and magnetic field. ... -
Intense laser field effect on impurity states in a semiconductor quantum well: transition from the single to double quantum well potential
Duque, C. A.; Mora-Ramos, M. E.; Kasapoglu, E.; Sari, H.; Sokmen, I. (SPRINGER, 2011)In this work are studied the intense laser effects on the impurity states in GaAs-Ga1- (x) Al (x) As quantum wells under applied electric and magnetic fields. The electric field is taken oriented along the growth direction ... -
Intense laser field effects on the intersubband optical absorption and refractive index change in the delta-doped GaAs quantum wells
Sari, H.; Yesilgul, U.; Ungan, F.; Sakiroglu, S.; Kasapoglu, E.; Sokmen, I. (ELSEVIER SCIENCE BV, 2017)In this paper, we have investigated the effects of the non-resonant intense laser field on the electronic and optical properties such as linear, nonlinear and the total optical absorption coefficient and refractive index ... -
Intense laser field effects on the linear and nonlinear intersubband optical properties of a semi-parabolic quantum well
Kasapoglu, E.; Duque, C. A.; Sari, H.; Sokmen, I. (SPRINGER, 2011)By using the compact-density matrix approach, the effect of a nonresonant intense laser field on the linear and nonlinear optical absorptions based on intersubband transitions and the refractive index changes in an asymmetric ... -
Intense Laser Field Effects on the Shallow-Donor Impurity States in Rectangular-Shaped Quantum Well Wires
Duque, C. A.; Mora-Ramos, M. E.; Yesilgul, U.; Ungan, F.; Sakiroglu, S.; Kasapoglu, E.; Sari, H.; Sokmen, I. (POLISH ACAD SCIENCES INST PHYSICS, 2014)Using the effective mass and parabolic band approximations, the binding energy of a shallow donor impurity is calculated in a GaAs-(Ga,Al)As quantum well wire of rectangular transversal section, under the combined effects ...