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

15 Jan 2019  ·  Artioli Alberto NEEL, INAC, Rueda-Fonseca Pamela NEEL, INAC, Moratis Kimon INAC, NEEL, Motte Jean-François NEEL, Donatini Fabrice NEEL, Hertog Martien I Den NEEL, Robin Eric INAC, André Régis NEEL, Niquet Yann-Michel INAC, Bellet-Amalric Edith INAC, Cibert Joel NEEL, Ferrand David NEEL ·

A whole series of complementary studies have been performed on the same, single nanowire containing a quantum dot: cathodoluminescence spectroscopy and imaging, micro-photoluminescence spectroscopy under magnetic field and as a function 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... The complete set of data shows that the CdTe quantum dot features the heavy-hole state as a ground state, although the compressive mismatch strain promotes a light-hole ground state as soon as the aspect ratio is larger than unity (elongated dot). A numerical calculation of the whole structure shows that the transition from the heavy-hole to the light-hole configuration is pushed toward values 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 valence band offset between the semiconductors in the dot and around it. read more

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Mesoscale and Nanoscale Physics Materials Science