Abstract
Two-dimensional InGaAs quantum dot superlattice is expected to offer coherent exciton formation enabling rapid carrier recombination. As the exciton coherent length is elongated by lowering the excitation power density, a transition of coupling among quantum dots from incoherent to coherent was confirmed. The photoluminescence decay time exhibited significant reduction at higher energy of emission indicating very fast carrier transfer at the bottom of miniband energy.
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