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. 2017 Jul 19;7:5788. doi: 10.1038/s41598-017-06316-7

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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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(a) The transient transmission changes of the probe pulses through the un-doped GaN. The pump/probe wavelength (photon energy) is 820 nm (1.5 eV). (b) The schematic diagram illustrates the density of states in un-doped GaN. Since there is no state at 1.5 eV in un-doped GaN, the transient response in (a) is associated with carrier dynamics in the bandtail states monitored by the two-photon transition of the 1.5 eV probe pulses.