P. Kraus, Christopher J. Kaplan, M. Zuerch, Hung-Tzu Chang, M. Jager, S. Cushing, L. Borja, D. Neumark, S. Leone
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Attosecond transient reflectivity is developed to observe the photoexcitation dynamics in germanium. Attosecond time-resolved measurements of the dielectric function reveal a few-femtosecond collective electronic response time, which renormalizes the Coulomb interaction between the excited carriers.