Browsing by Author "Yesilgul, U."
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THE EFFECTS OF TEMPERATURE AND HYDROSTATIC PRESSURE ON THE DIAMAGNETIC SUSCEPTIBILITY OF A DONOR IN A QUANTUM WELL
Yesilgul, U.; Ungan, F.; Kasapoglu, E.; Sari, H.; Sokmen, I. (WORLD SCIENTIFIC PUBL CO PTE LTD, 2011)Using the effective-mass approximation within a variational scheme, we have calculated the diamagnetic susceptibility and binding energy of a hydrogenic donor in a quantum well under different temperatures and hydrostatic ... -
The effects of temperature and hydrostatic pressure on the photoionization cross-section and binding energy of impurities in quantum-well wires
Yesilgul, U.; Sakiroglu, S.; Kasapoglu, E.; Sari, H.; Soekmen, I. (ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD, 2010)Using a variational approach, we have calculated the donor impurity related photoionization cross-section and impurity binding in GaAs/GaAlAs quantum-well wires under different temperature and hydrostatic pressure conditions. ... -
The effects of temperature and hydrostatic pressure on the photoionization cross-section and binding energy of shallow donor impurities in quantum dots
Yesilgul, U.; Kasapoglu, E.; Sari, H.; Sokmen, I. (ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD, 2010)Using a variational approach we have calculated the hydrostatic pressure and temperature effects on the donor impurity related photoionization cross-section and impurity binding in GaAs/GaAlAs quantum dots Our calculations ... -
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 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-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 ... -
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 ... -
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 ... -
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 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 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 ... -
Intense laser field effects on the third-harmonic generation in a quantum pseudodot system
Sakiroglu, S.; Kilic, D. Gul; Yesilgul, U.; Ungan, F.; Kasapoglu, E.; Sari, H.; Sokmen, I. (ELSEVIER SCIENCE BV, 2017)In this research, we present the effects of high-frequency intense laser field on the third-harmonic generation associated with intersubband transitions in a two-dimensional quantum pseudodot system subjected to an uniform ... -
THE INTERSUBBAND TRANSITIONS AND BINDING ENERGY OF SHALLOW DONOR IMPURITIES IN DIFFERENT SHAPED QUANTUM WELLS UNDER THE MAGNETIC FIELD
Yesilgul, U.; Ungan, F.; Kasapoglu, E.; Sari, H.; Sokmen, I. (WORLD SCIENTIFIC PUBL CO PTE LTD, 2011)The intersubband transitions and impurity binding energy in differently shaped semiconductor quantum wells under a magnetic field are calculated using a variational method within the effective mass approximation. Our ... -
The linear and nonlinear intersubband optical absorption coefficients and refractive index changes in a V-shaped quantum well under the applied electric and magnetic fields
Yesilgul, U.; Ungan, F.; Kasapoglu, E.; Sari, H.; Sokmen, I. (ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD, 2011)In this study, the changes in the optical absorption coefficients and the refractive index in a V-shaped quantum well have investigated theoretically. Within the effective mass approximation, the electronic structure of ... -
Linear and nonlinear intersubband optical absorption coefficients and refractive index changes in symmetric double semi-V-shaped quantum wells
Yesilgul, U. (ELSEVIER SCIENCE BV, 2012)In this study, the changes in the refractive index and intersubband optical absorption coefficients in symmetric double semi-V-shaped quantum wells are investigated theoretically. The energy levels and the envelope wave ... -
Linear and nonlinear optical properties in an asymmetric double quantum well under intense laser field: Effects of applied electric and magnetic fields
Yesilgul, U.; Al, E. B.; Martinez-Orozco, J. C.; Restrepo, R. L.; Mora-Ramos, M. E.; Duque, C. A.; Ungan, F.; Kasapoglu, E. (ELSEVIER SCIENCE BV, 2016)In the present study, the effects of electric and magnetic fields on the linear and third-order nonlinear optical absorption coefficients and relative change of the refractive index in asymmetric GaAs/GaAlAs double quantum ...