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

PDF Abstract
No code implementations yet. Submit your code now

Categories


Mesoscale and Nanoscale Physics Materials Science