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首页> 外文期刊>Physica status solidi, B. Basic research >Femtosecond buildup of a many-body resonance observed via two-dimensional THz time-domain spectroscopy
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Femtosecond buildup of a many-body resonance observed via two-dimensional THz time-domain spectroscopy

机译：飞秒累积通过二维太赫兹时域光谱法观察到的多体共振

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摘要

in a non-equilibrium electron-hole plasma photoexcited in GaAs within 10 fs, we observe how a plasmon pole builds up on a femtosecond time scale. To this end, the dynamics of the complex dielectric function throughout the mid-infrared is probed with uncertainty-limited temporal resolution by means of ultrabroadband THz spectroscopy. We show that collective effects, such as plasma oscillations, exhibit a delayed onset. This observation may be linked to the ultrafast formation of dressed quasiparticles in the many-body system. The approximate time scale for these phenomena is found to be of the order of the inverse plasma frequency. Thus, our findings support quantum kinetic models of the temporal evolution of the Coulomb interaction after ultrafast carrier generation in semiconductors. These theories have been co-pioneered by R. Zimmermann and his coworkers around the beginning of the last decade. [References: 20]
机译：在10 fs内用GaAs光激发的非平衡电子空穴等离子体中，我们观察到等离激元极在飞秒时间尺度上如何建立。为此，借助超宽带太赫兹光谱技术，以不确定性受限的时间分辨率来探测整个中红外区域的复杂介电功能的动力学。我们表明，集体效应，如等离子体振荡，表现出延迟的发作。该观察结果可能与多体系统中修饰过的准颗粒的超快形成有关。发现这些现象的近似时间尺度为逆等离子体频率的数量级。因此，我们的发现支持了半导体中超快载流子产生后库仑相互作用的时间演化的量子动力学模型。这些理论是R. Zimmermann和他的同事们在近十年初期共同提出的。 [参考：20]

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