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. 2017 Nov 3;8:1300. doi: 10.1038/s41467-017-01360-3

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© The Author(s) 2017

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. 3 — HC cooling governed by hot-phonon bottleneck and Auger heating effects at carrier densities above 10¹⁹ cm⁻³. a HC cooling dynamics following photoexcitation at 2.48 eV with a carrier density n ₀ of 10.4 × 10¹⁸ cm⁻³ at RT. Black circles: HC temperature extracted from TA spectra. The lines show the calculated HC cooling dynamics for τ _ph = 0.6 ps: with hot-phonon (HP) effect only (violet dashed line); with both HP and Auger heating (AH) effects (bright red line); and without HP and AH effects (magenta dotted line). b Schematic of hot electron relaxation process via LO phonon emission and non-radiative Auger recombination that contributes to further deceleration of hot electron cooling. The same process will also be present for the hot holes (not shown for clarity)