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arXiv · 2512.05582

Plasmascopy of ultrafast hot charges in solids

Dmitry A. Zimin·Raja Sen·Muhammad Qasim·Jelena Sjakste·Vladislav S. Yakovlev
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Abstract

We demonstrate an electric field-resolved approach for probing ultrafast dynamics of photoinjected charges in solids. Direct access to the electric field of few-cycle pulses enables us to measure a broadband response of a medium with associated plasma frequency. We prepare an ensemble of photoinjected hot charge carriers with energies sufficient to trigger impact ionization and establish a framework to measure its dynamics. Our study reveals the first time-resolved observation of the short-lived ultrafast impact ionization in germanium counteracted by trapping of mobile charges at later times. This approach provides a promising route for studying ultrafast many-body physics in photoexcited solids, with predictions from advanced theoretical models.

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Dmitry A. Zimin, Raja Sen, Muhammad Qasim, Jelena Sjakste, Vladislav S. Yakovlev. 2025-12-05. Plasmascopy of ultrafast hot charges in solids. https://arxiv.org/abs/2512.05582

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