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

Abstract:

: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 ap- proach 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.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Klenovský P,Steindl P,Geffroy D

doi

10.1038/srep45568

subject

Has Abstract

pub_date

2017-03-30 00:00:00

pages

45568

issn

2045-2322

pii

srep45568

journal_volume

7

pub_type

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