Time-domain ab initio study of Auger and phonon-assisted auger processes in a semiconductor quantum dot.
basic_science · Level V
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- Record sourced from PubMed, PMID 21452839.
- Also identified by DOI 10.1021/nl200651p.
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Abstract
We developed time-domain ab initio simulation of Auger phenomena, including multiple exciton generation (MEG) and recombination (MER). It is the first approach describing phonon-assisted processes and early dynamics. MEG starts below the electronic threshold, strongly accelerating with energy. Ligands are particularly important to phonon-assisted MEG, which therefore can be probed with infrared spectroscopy. Short-time gaussian component gives 5-10% of MEG, justifying rate theories that assume exponential dynamics. MER is preceded by electron-phonon relaxation to low energies.
Medical subject headings
- Models, Theoretical
- Quantum Dots
- Semiconductors