Cross-correlation spectroscopy in a single quantum dot

Summary form only given. Recent photon correlation measurements performed on single quantum dots provide evidence for non-classical emission from these structures. We show here how this technique can be used to study multi-charged lines in quantum dots (QDs). We studied a sample of InAs/GaAs MBE grown quantum dots. Single QDs are isolated in 2 microdisks containing at most one QD. The sample is studied at 4 K in a microphotoluminescence setup for which a cw diode laser emitting at 785 nm is used. The QD we study here presents two lines (XI, X2) at low power and an additional line (XX) at higher power. From power dependent intensity measurements, we infer that X1 and X2 are related to single exciton events, whereas XX stems from biexciton recombination. This spectrum is typical of the various QDs in our sample.