Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2009-05-27
Probing long-lived dark excitons in self-assembled quantum dots, Phys. Rev. B 81, 081304(R) (2010) [4 pages]
Physics
Condensed Matter
Other Condensed Matter
5 pages, 4 figures
Scientific paper
10.1103/PhysRevB.81.081304
The spin-flip rate that couples dark and bright excitons in self-assembled quantum dots is obtained from time-resolved spontaneous emission measurements in a modified local density of optical states. Employing this technique, we can separate effects due to non-radiative recombination and unambiguously record the spin-flip rate. The dependence of the spin-flip rate on emission energy is compared in detail to a recent model from the literature, where the spin flip is due to the combined action of short-range exchange interaction and acoustic phonons. We furthermore observe a surprising enhancement of the spin-flip rate close to a semiconductor-air interface, which illustrates the important role of interfaces for quantum dot based nanophotonic structures. Our work is an important step towards a full understanding of the complex dynamics of quantum dots in nanophotonic structures, such as photonic crystals, and dark excitons are potentially useful for long-lived coherent storage applications.
Hvam Jørn M.
Johansen Jeppe
Julsgaard Brian
Lodahl Peter
Stobbe Søren
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