Abstract

In recent years, extensive time-resolved experiments on hot electron relaxation have been performed on a subpicosecond time scale. Energy relaxation of hot holes, however, is less understood for two reasons: First, one expects a larger energy relaxation rate for holes than for electrons, so that an investigation of hole relaxation in the time domain needs higher time resolution. Second, suitable measurement techniques for a direct investigation of hole relaxation are lacking. In previous studies of ultrafast electron relaxation, hole relaxation has been assumed to be completed within 300 fs.¹ Theoretical calculations of hole relaxation have used very different values of deformation potential coupling constant of TO phonons between 10 eV² and 41 eV³ for GaAs.

© 1992 Optical Society of America