Browsing by Author "Sokmen, I."
Now showing items 1-20 of 105
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Barrier height effect on binding energies of shallow hydrogenic impurities in coaxial GaAs/AlxGa1-xAs quantum well wires under a uniform magnetic field
Karki, H. D.; Elagoz, S.; Baser, P.; Amca, R.; Sokmen, I. (ACADEMIC PRESS LTD ELSEVIER SCIENCE LTD, 2007)The ground state binding energies of axial hydrogenic impurities in a coaxial cylindrical quantum well wire are reported as a function of the barrier height and the radius of wire in the presence of a uniform magnetic field ... -
Binding energies of donor impurities in modulation-doped GaAs/AlxGa1-xAs double quantum wells under an electric field
Kasapoglu, E.; Ungan, F.; Sari, H.; Sokmen, I. (ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD, 2009)In this study, we have investigated theoretically the binding energies of shallow donor impurities in modulation-doped GaAs/Al0.33Ga0.67 As double quantum wells (DQWs) under an electric field which is applied along the ... -
Binding energy of donor impurity states and optical absorption in the Tietz-Hua quantum well under an applied electric field
Al, E. B.; Kasapoglu, E.; Sakiroglu, S.; Duque, C. A.; Sokmen, I. (ELSEVIER SCIENCE BV, 2018)For a quantum well which has the Tietz-Hua potential, the ground and some excited donor impurity binding energies and the total absorption coefficients, including linear and third order nonlinear terms for the transitions ... -
Binding energy of impurity states in an inverse parabolic quantum well under magnetic field
Kasapoglu, E.; Sari, H.; Sokmen, I. (ELSEVIER SCIENCE BV, 2007)We have investigated the effects of the magnetic field which is directed perpendicular to the well on the binding energy of the hydrogenic impurities in an inverse parabolic quantum well (IPQW) with different widths as ... -
Broadband asymmetric quantum-well infrared photodetector in long-wavelength infrared range (LWIR)
Hostut, M.; Ergun, Y.; Sokmen, I. (IEEE, 2007)A theoretical investigation of a GaAs-AlGaAs infrared detector consisting of three asymmetric quantum wells is presented. Each quantum well is sensitive to yield absorption and a photoresponse at peak wavelengths of 8 pro, ... -
Broadband staircase quantum well infrared photodetector with low dark current
Ergun, Y.; Hostut, M.; Eker, S. U.; Sokmen, I. (ELSEVIER SCIENCE BV, 2006)We present a theoretical investigation of a novel staircase-like quantum well infrared photodetector (QWIP). It detects wavelengths between 8.8 mu m and 12.3 mu m at an applied electric field of F= 6 x 10(4) V/cm at room ... -
Broadband staircase quantum well infrared photodetector: working in long wavelength infrared range (LWIR)
Hostut, M.; Kartal, D.; Ergun, Y.; Sokmen, I. (WILEY-V C H VERLAG GMBH, 2007)We present a theoretical investigation of a staircase-like quantum well infrared photodetector (QWIP). it detects wavelength between 7.6 mu m and 13.5 mu m range at an applied electric field of F = 1.9x10(4) V/cm at 77 K. ... -
Combined effects of intense laser field and applied electric field on exciton states in GaAs quantum wells: Transition from the single to double quantum well
Duque, C. A.; Mora-Ramos, M. E.; Kasapoglu, E.; Sari, H.; Sokmen, I. (WILEY-V C H VERLAG GMBH, 2012)The effects of intense laser radiation on the exciton states in GaAs-Ga1xAlxAs quantum wells are studied with the inclusion of applied dc electric fields oriented along the growth direction of the system. The calculations ... -
Combined effects of intense laser field, electric and magnetic fields on the nonlinear optical properties of the step-like quantum well
Kasapoglu, E.; Duque, C. A.; Mora-Ramos, M. E.; Restrepo, R. L.; Ungan, F.; Yesilgul, U.; Sari, H.; Sokmen, I. (ELSEVIER SCIENCE SA, 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 for transition between two lower-lying electronic ... -
Combined effects of the intense laser field, electric and magnetic fields on the optical properties of n-type double delta-doped GaAs quantum well
Sari, H.; Kasapoglu, E.; Sakiroglu, S.; Yesilgul, U.; Ungan, F.; Sokmen, I. (ELSEVIER SCIENCE BV, 2017)In the present work, the effects of the non-resonant intense laser field, electric and magnetic fields on the optical properties, such as linear, third order nonlinear and the total optical absorption coefficient and ... -
Density of impurity states of hydrogenic impurities in an inverse parabolic quantum well under the magnetic field
Kasapoglu, E.; Sari, H.; Sokmen, I. (ELSEVIER SCIENCE BV, 2007)We investigated the effects of the magnetic field on the density of impurity states in a GaAs/GaAlAs inverse parabolic quantum well (lPQW) for different Al concentrations at the well center. The calculations were performed ... -
Dependence of impurity binding energy on nitrogen and indium concentrations for shallow donors in a GaInNAs/GaAs quantum well under intense laser field
Ungan, F.; Kasapoglu, E.; Sari, H.; Sokmen, I. (SPRINGER, 2011)Within the framework of the effective-mass approximation, using a variational method, we have calculated the effect of intense laser radiation on the binding energy of the shallow-donor impurities in a Ga1-xInxNyAs1-y/GaAs ... -
Donor impurity states and related optical responses in triangular quantum dots under applied electric field
Kasapoglu, E.; Ungan, F.; Sari, H.; Sokmen, I.; Mora-Ramos, M. E.; Duque, C. A. (ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD, 2014)The linear and nonlinear coefficients for the optical absorption and relative refractive index change associated with transitions between donor impurity states in a two-dimensional quantum dot of triangular shape under ... -
Effect of exchange-correlation potential on the plasmon dispersions in a doped symmetrical double quantum well
Tuezemen, E. Senadim; Turkoglu, A.; Ergun, Y.; Sokmen, I.; Tanatar, B. (WILEY-V C H VERLAG GMBH, 2007)We have calculated the plasmon dispersion relations in a doped double quantum well with and without exchange-correlation potential added to the effective potential of the system. The calculations were done for high and low ... -
Effect of hydrostatic pressure on interband transitions in coupled quantum wires
Kasapoglu, E.; Gunes, M.; Sokmen, I. (IOP PUBLISHING LTD, 2007)We calculate the exciton binding energy and interband optical absorption in a rectangular coupled quantum wire under the hydrostatic pressure in the effective-mass approximation, using the variational approach. It is found ... -
The effect of hydrostatic pressure on subband structure and optical transitions in modulation-doped quantum well
Ungan, F.; Yesilgul, U.; Sakiroglu, S.; Kasapoglu, E.; Sari, H.; Sokmen, I. (ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD, 2011)Within the framework of effective-mass approximation, we have calculated theoretically the effects of hydrostatic pressure and doping concentration on subband structure and optical transitions in modulation-doped ... -
Effect of intense high-frequency laser field on the linear and nonlinear intersubband optical absorption coefficients and refractive index changes in a parabolic quantum well under the applied electric field
Yesilgul, U.; Ungan, F.; Sakiroglu, S.; Mora-Ramos, M. E.; Duque, C. A.; Kasapoglu, E.; Sari, H.; Sokmen, I. (ELSEVIER SCIENCE BV, 2014)The effects of the intense high-frequency laser field on the optical absorption coefficients and the refractive index changes in a GaAs/GaAlAs parabolic quantum well under the applied electric field have been investigated ... -
The effect of intense laser field on the photoionization cross-section and binding energy of shallow donor impurities in graded quantum-well wire under an electric field
Kasapoglu, E.; Sari, H.; Yesilgul, U.; Sokmen, I. (IOP PUBLISHING LTD, 2006)The laser-field dependence of the impurity binding energy and donor-related photoionization cross-section in graded quantum-well wire under an external static electric field is calculated by a variational method and in the ... -
Effect of magnetic fields on the linear and nonlinear intersubband optical absorption coefficients and refractive index changes in square and graded quantum wells
Ozturk, E.; Sokmen, I. (ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD, 2010)In this study, both the intersubband optical absorption coefficients and the refractive index changes as dependent on the magnetic field are calculated in square and graded quantum wells. Our results show that the position ... -
The effect of nitrogen on the diamagnetic susceptibility of a donor in GaxIn1-xNyAs1-y/GaAs quantum well under the magnetic field
Kilicarslan, E.; Sakiroglu, S.; Kasapoglu, E.; Sari, H.; Sokmen, I. (ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD, 2010)The binding energy and diamagnetic susceptibility of a hydrogenic donor in a GaxIn1-xNyAs1-y/GaAs quantum well has investigated in the presence of the magnetic field by using a trial wave function in the framework of the ...
