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. 2020 Mar 3;9:30. doi: 10.1038/s41377-020-0265-4

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — a Pump-induced change in the THz transmission as a function of the pump-probe delay time for pure and Au-implanted Ge. The pump fluence is 12.5 μJ/cm², and the wavelength is 800 nm. b Bi-exponential fits of the decay dynamics for the Ge:Au samples. The curves for the 5 × 10¹³ ions/cm² dose are vertically shifted for clarity (multiplied by 2)