Fig. 3

Probability density distribution |Ψ(r)|² for the four lowest electron (left) and holes (right) states, calculated in the framework of a 4-band k · p model. Left columns show |Ψ(r)|² for states whose wavefunction is localized in QD2, whereas for right columns, it is in QD1. The calculated energies of the electron states are E1 = 1.3185 and 1.3321, E2 = 1.3190 and 1.3325, E3 = 1.3190 and 1.3325, and E4 = 1.3197 and 1.3331 and of the holes are H1 = 0.0125 and 0.0136, H2 = 0.0106 and 0.0117, H3 = 0.0106 and 0.01176, and H4 = 0.0083 and 0.0095, all in eV. Zero energy corresponds to the top of the valence band of bulk InAs