Alternating Periods Of Phonon Attenuation (VIDEO)
Caption
Left: Amplitude of GaAs optical phonons at the interface between the thin AlAs layer and the thick GaAs layer [Fig. 1(c)]. Red curve: LO phonon oscillations with a THz-driven electronic current in the thick GaAs layer. Blue curve: phonon oscillations without the amplifying mechanism. Right: Spatiotemporal evolution [cf. moving circles in the left panel] of the LO phonon amplitude as a function of the penetration depth from the AlAs/GaAs interface into the thick GaAs layer [Fig. 1(c)]. The movie clearly shows alternating periods of phonon attenuation [situation Fig. 1(a)] and phonon amplification [situation Fig. 1(b)] depending on the phase of the driving THz pulse.
Credit
MBI Berlin
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