Browsing by Author "Sari, H"
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An alternative method for the exact calculation of WannierStark localization in superlattices
We present an alternative method for the exact calculations of the WannierStark (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 quantumwell wires of GaAs surrounded by Ga1chiAlchiAs in effectivemass 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/Ga1xAlxAs 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), Vshaped (VQW or full graded well) and square (SQW) GaAsGa1xAlxAs 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/Ga1xAlxAs 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 (PERGAMONELSEVIER SCIENCE LTD, 2003)This paper treats theoretically the angle dependence of the ground state binding energy of a shallow donor impurity in semiconductor quantumwell 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 laserfield dependence of the binding energy of shallowdonor 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 (SPRINGERVERLAG, 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 quantumwell 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 quantumwell wire. We have ... 
The effect of hydrostatic pressure on optical transitions in quantumwell wires (vol 353, pg 345, 2004)
Kasapoglu, E; Sari, H; Sokmen, I (ELSEVIER SCIENCE BV, 2005)… 
The effect of hydrostatic pressure on the photoionization crosssection and binding energy of impurities in quantumwell 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 donorimpurity related photoionization crosssection and impurity binding energy in GaAs/GaAlAs quantum wellwires. ... 
The effect of the donor distribution on the electronic structure of two coupled Si deltadoped layers in GaAs
We have theoretically investigated the electronic structure of two coupled Si deltadoped 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 quantumwell 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 quasibound state approximation is used to obtain the electric field dependence of the eigenvalues, eigenfunctions, electronhole 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 multiplequantumwell system subjected to an externally applied electric field in the growth direction and an externally applied tilted magnetic field are obtained ...