Abstract
We have carried out a large scale simulation of transient behavior of hot carriers in semiconductors excited by ultrashort laser pulses treating Coulomb interaction to high orders within the framework of the random phase approximation. We have used the non-equilibrium Green's function method and integrated the Dyson's equation numerically in the time domain on a large scale parallel computer. We have investigated cases where carriers are excited by double-pulsed laser light. The polarization at certain momentum was found not to diminish after the second pulse has passed in spite of the presence of the Coulomb scattering which normally causes both transverse and longitudinal polarization decay.
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