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Two-dimensional coherent spectroscopy on a series of quantum dot samples with different morphology reveals that biexciton binding is independent of the details of confinement in InAs dots, in contrast to the behavior in GaAs dots.
Multi-particle correlations are investigated in an InAs quantum dot ensemble using 2D Fourier-transform spectroscopy. Signatures of trions and a fifth-order contribution from the biexciton are observed by varying the excitation polarization and density.
Coherence decay times of and between fine-structure states is obtained from an InAs quantum dot ensemble using optical 2D Fourier-transform spectroscopy. This technique allows us to investigate properties of QDs within the ensemble.
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