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A whole series of complementary studies have been performed on the same,single nanowire containing a quantum dot: cathodoluminescence spectroscopy andimaging, micro-photoluminescence spectroscopy under magnetic field and as afunction of temperature, and energy-dispersive X-ray spectrometry and imaging.The ZnTe nanowire was deposited on a Si 3 N 4 membrane with Ti/Al patterns. Thecomplete set of data shows that the CdTe quantum dot features the heavy-holestate as a ground state, although the compressive mismatch strain promotes alight-hole ground state as soon as the aspect ratio is larger than unity(elongated dot). A numerical calculation of the whole structure shows that thetransition from the heavy-hole to the light-hole configuration is pushed towardvalues of the aspect ratio much larger than unity by the presence of a(Zn,Mg)Te shell, and that the effect is further enhanced by a small valenceband offset between the semiconductors in the dot and around it.

Light / heavy hole switching with correlated characterization on a  single quantum dot : Probing the light hole / heavy hole switching with  correlated magneto-optical spectroscopy and chemical analysis on a single  quantum dot