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Öğe Effect of spatial electric field on the sub-band energy in a cubic GaAs/AlAs quantum dot(Elsevier Science Bv, 2007) Dane, C.; Akbas, H.; Talip, N.; Kasapoglu, K.The electron sub-band energy of a cubic GaAs/AlAs quantum dot under an applied spatial electric field is theoretically investigated within a variational scheme. In this case, we show that the electron sub-band energy E decreases with spatial electric field strength F and increases or decreases depending upon the orientation of the spatial electric field. (C) 2007 Elsevier B.V. All rights reserved.Öğe The hydrostatic pressure and electric field effects on the normalized binding energy of hydrogenic impurity in a GaAs/AlAs spherical quantum dot(Elsevier Science Bv, 2011) Dane, C.; Akbas, H.; Guleroglu, A.; Minez, S.; Kasapoglu, K.A theoretical study of combined effects of the hydrostatic pressure and the electric field on the subband ground state energy and on the normalized ground state binding energy of a hydrogenic donor impurity on center located in a GaAs/AlAs spherical quantum dot with fixed dot radius is presented. The study is performed in the framework of the effective mass and parabolic band approximations and using a variational procedure. As a key result, it may be possible to gather high resolution maps of electric field on the studied structure with described technique. (C) 2011 Elsevier B.V. All rights reserved.Öğe Spatial electric field effect in a GaAs/AlAs tetragonal quantum dot(Elsevier Science Bv, 2008) Akbas, H.; Dane, C.; Kasapoglu, K.; Talip, N.Within the effective-mass approximation and with two-parameter variational procedure we have calculated the effect of spatial electric field and ratios of dot edge lengths(c/a) on the electron sub-band energy and the polarization of an electron in the tetragonal GaAs/AlAs quantum dot. It is found that the electric flux Phi leaving the tetragonal dot is reliable parameter for describing the structure. (C) 2007 Elsevier B.V. All rights reserved.