Abstract
The influence of the direct and exchange Coulomb interaction on Landau level formation in strain-induced quantum dots (QD) has been studied by high-field (45 T) magneto-luminescence and by many-electron–many-hole Hartree–Fock calculations. The Darwin–Fock states of the dots are found to merge into a single Landau level at very high fields with a considerable reduction in the total diamagnetic shift due to the enhanced electron–hole correlation caused by the increased degeneracy of the state. We calculate a 50% reduction of the diamagnetic shift as a result of direct and exchange Coulomb interaction in the squeezed carrier states, in excellent agreement with the experimental findings.
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