MAGNETIC-FIELD EFFECTS ON ONE-HOLE AND 2-HOLE STATES IN PARABOLIC QUANTUM DOTS

Using a multiband effective-mass theory, we have calculated the one- a nd two-hole energies in a parabolic quantum dot in the presence of a p erpendicular magnetic field. The valence-band degeneracy, the Coulomb interaction, and the effect of finite offsets are all taken into accou nt. The energies are calculated variationally with an iterative relaxa tion technique. The single-hole levels show strong anticrossings due t o the valence-band mixing. As a result they have in general a weaker f ield dependence compared with the corresponding uncoupled levels. For the two-hole states both the valence-band mixing and the Coulomb inter action are shown to be substantial. The correlations between the holes are strong enough to change the total angular momentum of the ground state when the magnetic field is increased.