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Proceedings Paper

Femtosecond buildup of phonon-plasmon coupling in photoexcited InP observed by ultrabroadband THz probing
Author(s): Rupert Huber; Carl Kübler; Stefan Tübel; Alfred Leitenstorfer
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Paper 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.

Paper Details

Date Published: 15 February 2006
PDF: 8 pages
Proc. SPIE 6118, Ultrafast Phenomena in Semiconductors and Nanostructure Materials X, 61180I (15 February 2006); doi: 10.1117/12.639910
Show Author Affiliations
Rupert Huber, Technische Univ. München (Germany)
Univ. of California at Berkeley (United States)
Carl Kübler, Univ. Konstanz (Germany)
Stefan Tübel, Technische Univ. München (Germany)
Alfred Leitenstorfer, Univ. Konstanz (Germany)

Published in SPIE Proceedings Vol. 6118:
Ultrafast Phenomena in Semiconductors and Nanostructure Materials X
Kong-Thon Tsen; Jin-Joo Song; Hongxing Jiang, Editor(s)

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