Physics – Condensed Matter – Materials Science
Scientific paper
2011-01-13
J. Appl. Phys. Vol. 109, 073715 (2011)
Physics
Condensed Matter
Materials Science
5 pages, 4 figures, submitted to Journal of Applied Physics
Scientific paper
10.1063/1.3562188
We demonstrate optical control of the LO phonon-plasmon coupled (LOPC) modes in GaAs by using a femtosecond pump-pulse pair. The relaxation time of the plasmon-like LOPC mode significantly depends on the separation time (\Delta t) of the pump-pulse pair. Especially it is maximized when \Delta t becomes simultaneously comparable to the half period of the longitudinal optical (LO) phonon oscillation and resonant to the 3/4 period of the plasmon-like LOPC oscillation. We attribute these observations to the modification of carrier-LO phonon scattering and ballistic motion of the plasmon-like LOPC mode.
Hase Muneaki
Hayashi Daisuke
Lee Dominic J.
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