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Effect of electric field, dielectric screening and conduction band nonparabolicity of donor in a quantum dot
International Journal of Modern Physics B13 Apr 2018
Preview Abstract
The effect of electric field, dielectric screening, conduction band nonparabolicity and effective mass mismatch of a hydrogenic donor in a GaAs/Ga $_{x}$ $_{x}$ Al $_{1 - x}$ $_{1 - x}$ As spherical quantum dot is investigated by assuming parabolic confinement using variational method. In the present work we obtain the increase of binding energy by decreasing the dot size for certain dot radii (50 Å) and the screening function gives uniformly larger values for smaller dot size. The effect of electric field and temperature decrease the donor binding energy whereas the conduction band nonparabolicity leads to increased binding energy.