Excitonic fock-darwin spectra from electron-hole droplets in self-assembled quantum dots

Charge-neutral droplets of electrons and holes in Quantum Dots (QDs) are probed optically. The application of strong magnetic fields creates a typical pattern of levels shifting and crossing, which closely resembles that of a single particle Fock-Darwin (F-D) spectrum. We show that the relevant particle in this context is an exciton whose behavior is dominated by the single particle character of both electron and hole due to the wavefunction symmetry in the QDs. However, precise quantitative analysis can be performed introducing many-body effects where direct Coulomb interaction, exchange energy and configuration coupling contribute to renormalization of the emission energies and alteration of the F-D spectra. Wavefunction symmetry plays a role in imposing quasi-degenerate transitions at specific magnetic fields whereby hybridization of states with opposing magnetic field dependence creates a cancellation of the level shifting for a limited range of magnetic fields.