Magnetic-field dependence of the impurity states in a dome-shaped quantum dot

- Magnetic field effect on the donor states in dome shaped QD with wetting layers.
- Energy levels and transition energies computed for different impurity locations.
- Diamagnetic shift increases monotonously with the applied field.
- Transitions frequencies between the S and P states range in terahertz region.

Using the finite element method, the effect of magnetic fields on the donor states and transition energies in a InAs/GaAs quantum dot coupled to its wetting layers is investigated. Results are obtained for different impurity locations. We found that the diamagnetic shift of the ground state energy increases monotonously with the applied field and can be described by a simple function which interpolates between the low and high magnetic-field behavior. Frequencies associated to the transitions between the S-like ground state and P− (P+) excited states range in terahertz region and show a magnetic field-induced red (blue) shift, irrespectively of the impurity position.

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