Gamma -> L intervalley and polar optic scattering times in GaAs from cw hot electron luminescence spectroscopy

Wolfgang K. P. Hackenberg; Gerhard Fasol; Elisabeth Bauser; Klaus H. Ploog

doi:10.1117/12.20708

1 August 1990 Gamma -> L intervalley and polar optic scattering times in GaAs from cw hot electron luminescence spectroscopy

Wolfgang K. P. Hackenberg, Gerhard Fasol, Elisabeth Bauser, Klaus H. Ploog

Author Affiliations +

Proceedings Volume 1282, Ultrafast Laser Probe Phenomena in Bulk and Microstructure Semiconductors III; (1990) https://doi.org/10.1117/12.20708
Event: Advances in Semiconductors and Superconductors: Physics Toward Devices Applications, 1990, San Diego, CA, United States

Abstract

We deduce the F-L intervalley and poiar optic phonon scattering times of hot electrons in bulk GaAs from cw hot (e, A°) luminescence spectra as a function of electron kinetic energy at low excitation densities. We obtain the lifetime broadening due to these two processes from comparison with lineshape calculations using a 16x16 k.p Hamiltonian, a full integration over k-space and a dipole model for the optical matrix elements. We find for the LO-phonon emission time tLO=(l32±lO)fS. The threshold for IT-*L scattering is determined as (330±1O)meV, above which a distinct decrease in total lifetime is observed. Minimum F÷L scattering times are l5Ofs to 200fs. We discuss an estimation for the deformation potential DTL.

Citation Download Citation

Wolfgang K. P. Hackenberg, Gerhard Fasol, Elisabeth Bauser, and Klaus H. Ploog "Gamma -> L intervalley and polar optic scattering times in GaAs from cw hot electron luminescence spectroscopy", Proc. SPIE 1282, Ultrafast Laser Probe Phenomena in Bulk and Microstructure Semiconductors III, (1 August 1990); https://doi.org/10.1117/12.20708

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