Abstract

Is it necessary to take into account the diffusion of semiconductor plasma on the picosecond time scale? This question has been discussed since 1981 when it was reported that an ultrafast expansion of optically pumped semiconductor plasma was experimentally observed.¹ An effective diffusion coefficient of the process was estimated to be about 10⁶ cm²/sec. Abnormal high plasma diffusion rates have been discussed in terms of screened carrier-phonon scattering or attributed to Fermi pressure in degenerate plasma.

© 1994 IEEE