Abstract
The influence of the direct and exchange Coulomb interaction on Landau level formation in strain induced QD has been studied by high-field (45 T) magneto-luminescence measurements and by many-electron many-hole Hartree-Fock calculations. At high magnetic fields the degeneracy of the QD electron and hole ground states is increased as several zero-field eigenstates merge into the lowest Landau level. This leads to removal of the state filling and accordingly in high magnetic field the QD luminescence is emitted from the lowest Landau level. Using a generalization of Koopmans theorem for electron–hole many particle systems, we have studied the enhancement of the direct and exchange Coulomb interaction in squeezed carrier states. The results show that for 6 to 8 electron–hole pairs the direct and exchange interaction both reduce the diamagnetic shift by 15 to 25%.
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