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We have considered the ballistic propagation of the 2D electron Wignerdistribution, which is excited by an ultrashort optical pulse from ashort-range impurity into the first quantized subband of a selectively-dopedheterostructure with high mobility. Transient ionization of a deep local stateinto a continuum conduction c-band state is described. Since the quantum natureof the photoexcitation, the Wigner distribution over 2D plane appears to be analternating-sign function. Due to a negative contribution to the Wignerfunction, the mean values (concentration, energy, and flow) demonstrate anoscillating transient evolution in contrast to the diffusive classical regimeof propagation.

Transient quantum evolution of 2D electrons under photoexcitation of a deep center