Abstract
The alloy disorder scattering potential can introduce large k-vector scattering transitions, which are responsible for intervalley scattering. Disorder-induced scattering in AlxGa1-xAs is investigated in reciprocal-lattice space by calculating the (momentum) wave-vector components of the self-energy correction to the virtual-crystal model, using the coherent-potential approximation. The imaginary part of the coherent potential (the self-energy) is responsible for disorder-induced energy-level broadenings as a result of the scattering. The calculated disorder-induced intervalley scattering potential for -X transitions is found to be near the observed experimental value. The results for the disorder-induced L-X intervalley scattering potential are incorporated into an ensemble Monte Carlo simulation of a time-resolved optical pump-probe experiment in Al0.6Ga0.4As. It is found that disorder-induced L-X intervalley scattering lifetimes are 35 times larger than the phonon-induced intervalley scattering lifetimes.
Original language | English (US) |
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Pages (from-to) | 17072-17076 |
Number of pages | 5 |
Journal | Physical Review B |
Volume | 48 |
Issue number | 23 |
DOIs | |
State | Published - 1993 |
ASJC Scopus subject areas
- Condensed Matter Physics