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We have investigated coherent folded acoustic phonons in GaAs/AlAs superlattices (SLs) with 20 and 195 periods using an optical pump-probe technique. The beat profiles of the time-domain signals observed in the two SLs are different. Moreover, the time-domain signal in the 20-period SL decays faster than that in the 195-period SL. This results from the difference in the propagation time throughout...
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