Intervalley Scattering in GaAs and InP Probed by Pulsed Far‐Infrared Transmission Spectroscopy
The dynamics of photoexcited electrons in GaAs and InP were studied using the transmission of 200‐fs pulses of far‐infrared radiation in the spectral range 15–100 cm−1. Kinetic traces of the infrared transmission as a function of delay between optical excitation and infrared probe show a probe‐limited decrease in transmission followed by a more gradual (0.7–2 ps) drop to a steady value, consistent with the slow return of electrons from high‐mass satellite valleys. Infrared transmission spectra, analyzed in the context of a Drude model, reveal density‐dependent electron mobilities 3–4 times below equilibrium n‐doped values. Electron‐hole collisions likely account for the lower mobility.
© 1992 American Institute of Physics
“Intervalley scattering in GaAs and InP probed by pulsed far-infrared transmission spectroscopy,” P. N. Saeta, J. F. Federici, B. I. Greene, and D. R. Dykaar, Appl. Phys. Lett. 60, 1477 (1992). doi: 10.1063/1.107276
This article is also available from the American Institute of Physics at http://dx.doi.org/10.1063/1.107276.