Ultrafast Dynamics of Carrier Multiplication in Quantum Dots

Details Ultrafast Dynamics of Carrier Multiplication in Quantum Dots Ultrafast Dynamics of Carrier Multiplication in Quantum Dots

2011-05-27

arxiv.org/abs/1105.5657v1

Physics

Condensed Matter

Other Condensed Matter

12 pages, 7 figures, submitted

Scientific paper

A quantum-kinetic approach to the ultrafast dynamics of carrier multiplication in semiconductor quantum dots is presented. We investigate the underlying dynamics in the electronic subband occupations and the time-resolved optical emission spectrum, focusing on the interplay between the light-matter and the Coulomb interaction. We find a transition between qualitatively differing behaviors of carrier multiplication, which is controlled by the ratio of the interaction induced time scale and the pulse duration of the exciting light pulse. On short time scales, i.e., before intra-band relaxation, this opens the possibility of detecting carrier multiplication without refering to measurements of (multi-)exciton lifetimes.

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