Probing the light hole/heavy hole switching with correlated magneto-optical spectroscopy and chemical analysis on a single quantum dot.
Nanotechnology
; 30(17): 175301, 2019 Apr 26.
Article
em En
| MEDLINE
| ID: mdl-30650390
ABSTRACT
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 Si3N4 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.
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Bases de dados:
MEDLINE
Idioma:
En
Revista:
Nanotechnology
Ano de publicação:
2019
Tipo de documento:
Article
País de afiliação:
França