Effect of electric field on the energy levels of two interacting electrons in a quantum dot

The electric field induced shift of ground-state and higher energy levels of two interacting electrons in a GaAs quantum dot with parabolic confinement is presented. A perturbation method is used to calculate the shift in the electronic energy levels. The results indicate a negative energy level shift for ground and a few higher levels, while the shift is positive for other level. A periodicity of positive and negative energy level shifts occurs for higher energy levels. The lowering of energy levels is also found to be more pronounced for larger dots.