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Femtosecond buildup of phonon-plasmon coupling in photoexcited InP observed by ultrabroadband THz probing

机译:UltrabroadBand THz探测观察到的光孔型INP中的Phonon-Plasmmon耦合的Femtosecond积累

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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.
机译:我们研究纯纵向光学声子谐振到耦合的声子 - 等离子体系统的超快转变。在固有磷化铟铟的10-FS光筛下,UltrabroadBand THz光电电子器件监控出新的混合模式的相干节拍的积累,直接在具有子循环分辨率的时域中。相互排斥和再分配的相互作用声子和等离子体的振荡强度被认为出现在延迟的飞秒时间尺度上。针对各种激励密度监测混合模式的两个分支。我们观察到作为N的函数的耦合谐振的发音逆转。声子等离子体耦合的特征形成时间表现出密度依赖性。时间近似由混合模式的上部分支的一个振荡周期设置。

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