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Coherent folded longitudinal acoustic phonons in a GaAs/AlAs long-period superlattice (SL) have been investigated by using a reflection-type two-color pump-probe technique under the condition that the wave vector of the probe pulse in the sample exceeds the mini-Brillouin zone. The coherent oscillations observed in the time-domain signals indicate the propagation of the phonon wave packet through...
Summary form only given. Reversible phase change materials such as compounds of the pseudo-binary GeTe-Sb/sub 2/Te/sub 3/ system are applicable as high-density optical data storage media based on the relatively high difference in the reflection coefficients of the amorphous and the crystalline states. Although this principle is already employed in commercial DVD disks, the physics of the phase transitions...
Summary form only given. The investigation of coherent phonons has been a field of extensive efforts since the first observation of coherent phonons in 1990. Several excitation mechanisms for coherent phonons in solids have been identified among which the most prominent is impulsive stimulated first order Raman scattering. Coherent states exhibit an oscillating expectation value of the phonon amplitude...
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