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15 February 2006 Femtosecond buildup of phonon-plasmon coupling in photoexcited InP observed by ultrabroadband THz probing
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Abstract
We study the ultrafast transition of a pure longitudinal optical phonon resonance to a coupled phonon-plasmon system. Following 10-fs photoexcitation of intrinsic indium phosphide, ultrabroadband THz opto-electronics monitors the buildup of coherent beats of the emerging hybrid modes directly in the time domain with sub-cycle resolution. Mutual repulsion and redistribution of the oscillator strength of the interacting phonons and plasmons are seen to emerge on a delayed femtosecond time scale. Both branches of the mixed modes are monitored for various excitation densities N. We observe a pronounced anticrossing of the coupled resonances as a function of N. The characteristic formation time for phonon-plasmon coupling exhibits density dependence. The time is approximately set by one oscillation cycle of the upper branch of the mixed modes.
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Rupert Huber, Carl Kübler, Stefan Tübel, and Alfred Leitenstorfer "Femtosecond buildup of phonon-plasmon coupling in photoexcited InP observed by ultrabroadband THz probing", Proc. SPIE 6118, Ultrafast Phenomena in Semiconductors and Nanostructure Materials X, 61180I (15 February 2006); https://doi.org/10.1117/12.639910
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