Ultrafast Physics in Semiconductor Microstructures.
Abstract
Analyzed is picosecond photoluminescence data obtained from quasi-two- and quasi-zero-dimensional electron systems in GaAs/AlGaAs multiple quantum wells and CdSSe/glass spherical quantum wells. Important results are: (i) nonequilibrium phonons produced in the energy relaxation process of quasi-two-dimensional carriers in a vicinity of phonon wave number q sub e could behave like coherent Bosons within a short time period. The effects of nonequilibrium phonons for photogenerated carriers in undoped GaAs quantum wells are to slow the energy relaxation and to shorten the recombination lifetime. (ii) Electron-hole recombination dynamics in quasi-OD was interpreted based on the carrier confinement model. Ultrafast expansion of carriers in asymmetric GaAs quantum wells as observed under picosecond excitation. Dynamical changes in the band structure of GaAs and GaSe were measured under shock waves. Effects of nonequilibrium phonons on the energy relaxation and recombination lifetime of photogenerated carriers in undoped GaAs quantum wells; Observation of ultrafast lateral expansion of energetic carriers in an asymmetric GaAs quantum well; Electron-hole recombination lifetimes in a quasi-two-dimensional electron system in CdS(x)Se(1-x).
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 19, 1988
- Accession Number
- ADA193300
Entities
People
- Robert Alfano
Organizations
- City College of New York