Linear and nonlinear optical properties of a modified Gaussian quantum dot: pressure, temperature and impurity effect

Subject Areas : Journal of Optoelectronical Nanostructures

Hossein Bahramiyan ¹ , Somayeh Bagheri ²

1 - Department of Physics, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran
2 - Department of Physics, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran

Received: 2018-03-05 Accepted : 2018-06-07 Published : 2018-09-01

Keywords: Optical Properties, Modified Gaussian Quantum Dot, Impurity, Temperature and Pressure Effect,

Abstract :

In this paper, the effect of pressure, temperature and impurity on the energy
levels, binding energy, linear and nonlinear optical properties of a modified Gaussian
quantum dot are studied. In this regard, the finite element method is employed to solve
the single electron Schrodinger equation in the effective mass approximation with and
without impurity at the center of the dot. In addition, the energy levels, the wave
functions, biding energy, absorption coefficients and refractive index changes for
different pressures and temperatures are calculated. The results show that the energy
levels decrease by increasing pressure and increase by increasing the temperature for
both, with and without impurity, situations. Also, in the presence of impurity, the
refractive index changes are greater than the case without impurity and shift to higher
energies. Furthermore, by increasing the pressure, the refractive index changes increase
and shift to lower energy for both with and without impurity cases. By increasing the
pressure and temperature the absorption coefficients decrease and shift to lower energy
for all with and without impurity cases

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