Browsing by Author "Sari, H"
Now showing items 1-20 of 51
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An alternative method for the exact calculation of Wannier-Stark localization in superlattices
We present an alternative method for the exact calculations of the Wannier-Stark (WS) localization in a long periodic potential corresponding to a (50 Angstrom /30 Angstrom) GaAs/Ga0.7Al0.3As superlattice. We show that the ... -
Barrier thickness dependence of optical absorption of excitons in GaAs coupled quantum wire
Kasapoglu, E; Gunes, M; Sari, H; Sokmen, I (WORLD SCIENTIFIC PUBL CO PTE LTD, 2004)We have calculated the binding energy of excitons, and the interband optical absorption in rectangular coupled quantum-well wires of GaAs surrounded by Ga1-chiAlchiAs in effective-mass approximation, using the variational ... -
Binding energies of excitons in symmetric and asymmetric quantum wells in a magnetic field
Kasapoglu, E; Sari, H; Ergun, Y; Elagoz, S; Sokmen, I (ACADEMIC PRESS LTD, 1998)The binding energy of the exciton in the symmetric and asymmetric GaAs/Ga1-xAlxAs quantum wells is calculated with the use of a variational approach. Results have been obtained as a function of the potential symmetry, and ... -
Binding energies of shallow donor impurities in different shaped quantum wells under an applied electric field
Kasapoglu, E; Sari, H; Sokmen, I (ELSEVIER SCIENCE BV, 2003)We present a variational method to compute the binding energies for a hydrogenic impurity located at the center of the finite parabolic (PQW), V-shaped (VQW or full graded well) and square (SQW) GaAs-Ga1-xAlxAs quantum ... -
Binding energy of excitons in symmetric and asymmetric coupled double quantum wells in a uniform magnetic field
Kasapoglu, E; Sari, H; Balkan, N; Sokmen, I; Ergun, Y (IOP PUBLISHING LTD, 2000)The binding energy of excitons in symmetric and asymmetric coupled double GaAs/Ga1-xAlxAs quantum wells is calculated by using a variational approach. The results have been obtained in the presence of a uniform magnetic ... -
Binding energy of hydrogenic impurities in a quantum well under the tilted magnetic field
Kasapoglu, E; Sari, H; Sokmen, I (PERGAMON-ELSEVIER SCIENCE LTD, 2003)This paper treats theoretically the angle dependence of the ground state binding energy of a shallow donor impurity in semiconductor quantum-well systems on the tilted magnetic field. By making an appropriate coordinate ... -
The dependence of the intersubband transitions in square and graded QWs on intense laser fields
The intersubband absorption in square and graded quantum wells under a laser field is calculated within the framework of the effective mass approximation. We conclude that, for quantum wells with different shapes, the laser ... -
Double quantum well electronic energy spectrum within a tilted magnetic field
The analytical solutions of the Schrodinger equation for a double quantum well structure (DQWS) subjected to an externally applied tilted magnetic field are obtained and the results are discussed. The dependency of the ... -
The effect of an intense laser field on magneto donors in semiconductors
Sari, H; Kasapoglu, E; Sokmen, I (ELSEVIER SCIENCE BV, 2003)The laser-field dependence of the binding energy of shallow-donor impurities in graded, and square quantum wells under the external magnetic field is calculated by a variational method and in the effective mass approximation. ... -
Effect of crossed electric and magnetic fields on donor impurity binding energy
Kasapoglu, E; Sari, H; Sokmen, I (SPRINGER-VERLAG, 2004)By using an appropriate coordinate transformation, we have calculated variationally the ground state binding energy of a hydrogenic donor impurity in a quantum well in the presence of crossed electric and magnetic fields ... -
The effect of hydrostatic pressure on optical transitions in quantum-well wires
Kasapoglu, E; Sari, H; Sokmen, I (ELSEVIER SCIENCE BV, 2004)Using a variational approach, we have investigated mainly, the effect of the hydrostatic pressure, and the wire dimension on the interband optical absorption and the exciton binding energy in a quantum-well wire. We have ... -
The effect of hydrostatic pressure on optical transitions in quantum-well wires (vol 353, pg 345, 2004)
Kasapoglu, E; Sari, H; Sokmen, I (ELSEVIER SCIENCE BV, 2005)… -
The effect of hydrostatic pressure on the photoionization cross-section and binding energy of impurities in quantum-well wire under the electric field
Kasapoglu, E; Yesilgul, U; Sari, H; Sokmen, I (ELSEVIER SCIENCE BV, 2005)Using a variational approach, we have calculated the hydrostatic pressure and electric field effects on the donor-impurity related photoionization cross-section and impurity binding energy in GaAs/GaAlAs quantum well-wires. ... -
The effect of the donor distribution on the electronic structure of two coupled Si delta-doped layers in GaAs
We have theoretically investigated the electronic structure of two coupled Si delta-doped GaAs at T = 0 K. For the uniform donor distribution we have studied the influence of donor concentration on the subband structure. ... -
Effects of crossed electric and magnetic fields on shallow donor impurity binding energy in a parabolic quantum well
Kasapoglu, E; Sari, H; Sokmen, I (IOP PUBLISHING LTD, 2004)We have calculated variationally the ground state binding energy of a hydrogenic donor impurity in a parabolic quantum well in the presence of crossed electric and magnetic fields. These homogeneous crossed fields are such ... -
The effects of hydrostatic pressure and applied electric field on shallow donor impurities in GaAs/GaAlAs graded quantum well
Kasapoglu, E; Sari, H; Sokmen, I (WORLD SCIENTIFIC PUBL CO PTE LTD, 2005)Using a variational approach, we have investigated the effects of the hydrostatic pressure, the well dimension, impurity position and electric field direction on the binding energy of shallow donor impurities in GaAs/GaAlAs ... -
Electric field and intense laser field effects on the intersubband optical absorption in a graded quantum well
The laser field dependence of the intersubband optical absorption in a graded quantum well (GQW), under an applied electric field is calculated in the effective mass approximation. We have theoretically shown that, in the ... -
The electric field dependence of a donor impurity in graded GaAs quantum wires
Kasapoglu, E; Sari, H; Sokmen, I (SPRINGER HEIDELBERG, 2004)The effect of the electric field on the binding energy of the ground state of a shallow donor impurity in a graded GaAs quantum-well wire (GQWW) was investigated. The electric field was applied parallel to the symmetry ... -
Electric field dependence of the excitonic properties in graded double quantum wells
A quasi-bound state approximation is used to obtain the electric field dependence of the eigenvalues, eigenfunctions, electron-hole overlap integrals and excitonic binding energies for coupled, graded double quantum wells ... -
Electronic energy spectra in a multiple quantum well within external electric and tilted magnetic fields
The analytical solution of the Schrodinger equation for a multiple-quantum-well system subjected to an externally applied electric field in the growth direction and an externally applied tilted magnetic field are obtained ...