Large quantum dots with small oscillator strength

Details Large quantum dots with small oscillator strength Large quantum dots with small oscillator strength

2010-06-30

arxiv.org/abs/1006.5796v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures, submitted

Scientific paper

We have measured the oscillator strength and quantum efficiency of excitons confined in large InGaAs quantum dots by recording the spontaneous emission decay rate while systematically varying the distance between the quantum dots and a semiconductor-air interface. The size of the quantum dots is measured by in-plane transmission electron microscopy and we find average in-plane diameters of 40 nm. We have calculated the oscillator strength of excitons of that size and predict a very large oscillator strength due to Coulomb effects. This is in stark contrast to the measured oscillator strength, which turns out to be much below the upper limit imposed by the strong confinement model. We attribute these findings to exciton localization in local potential minima arising from alloy intermixing inside the quantum dots.

Affiliated with

Also associated with

No associations

Rating

Large quantum dots with small oscillator strength does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Large quantum dots with small oscillator strength, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Large quantum dots with small oscillator strength will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-153615