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Time-resolved transient Kerr reflectivity was used to study coherent phonon-plasmon excitations in GaAs:Al x Ga 1Ϫx As heterostructures containing a two-dimensional electron gas. Ultrafast laser pulses of 65 fs duration were used in a balanced optical bridge to observe the oscillatory component of the reflectivity changes directly. This was found to be strongly dependent on the excitation photon energy, showing a crossover in the spectral amplitude of the longitudinal anddoi:10.1103/physrevb.53.r16140 pmid:9983517 fatcat:dtymnslbt5edvju4mzxz2t6nau