CW Spectroscopy Of Ultrafast Relaxation In Semiconductor Heterostructures

S. A. Lyon; C. L. Petersen

doi:10.1117/12.947224

22 August 1988 CW Spectroscopy Of Ultrafast Relaxation In Semiconductor Heterostructures

S. A. Lyon, C. L. Petersen

Proceedings Volume 0942, Ultrafast Laser Probe Phenomena in Bulk and Microstructure Semiconductors II; (1988) https://doi.org/10.1117/12.947224
Event: Advances in Semiconductors and Superconductors: Physics and Device Applications, 1988, Newport Beach, CA, United States

Abstract

Steady state hot luminescence measurements can be used to determine hot carrier distributions and relaxation rates for extremely fast processes with low injected carrier densities. Luminescence gives a direct measure of the distribution of hot carriers in a semiconductor. We discuss experiments which probe the distribution of electrons high in the conduction band. These measurements have been used in GaAs to determine the LO phonon emission time by a hot electron(100 fs), the F to L intervalley scattering rate (250 fs for an electron initially about 70 meV above the bottom of the L-valleys), and the r to X intervalley scattering rate (30 fs for an electron about 85 meV above the bottom of the X-valleys). Recent experiments which measure the relaxation of hot electrons in the presence of a high density of cold electrons in bulk GaAs and GaAs quantum wells are presented.

Citation Download Citation

S. A. Lyon and C. L. Petersen "CW Spectroscopy Of Ultrafast Relaxation In Semiconductor Heterostructures", Proc. SPIE 0942, Ultrafast Laser Probe Phenomena in Bulk and Microstructure Semiconductors II, (22 August 1988); https://doi.org/10.1117/12.947224

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