Publication details

Excitonic structure and pumping power dependent emission blue-shift of type-II quantum dots

Authors

KLENOVSKÝ Petr STEINDL Petr GEFFROY Dominique

Year of publication 2017
Type Article in Periodical
Magazine / Source Scientific Reports
MU Faculty or unit

Faculty of Science

Citation
Web http://www.nature.com/articles/srep45568
Doi http://dx.doi.org/10.1038/srep45568
Field Solid matter physics and magnetism
Keywords multi-particle states; configuration interaction; photoluminescence; quantum dots
Description In this work we study theoretically and experimentally the multi-particle structure of the so-called type-II quantum dots with spatially separated electrons and holes. Our calculations based on customarily developed full configuration interaction approach reveal that exciton complexes containing holes interacting with two or more electrons exhibit fairly large antibinding energies. This effect is found to be the hallmark of the type-II confinement. In addition, an approximate self-consistent solution of the multi-exciton problem allows us to explain two pronounced phenomena: the blue-shift of the emission with pumping and the large inhomogeneous spectral broadening, both of those eluding explanation so far. The results are confirmed by detailed intensity and polarization resolved photoluminescence measurements on a number of type-II samples.
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