Ultrafast Formation of a Fermi-Dirac Distributed Electron Gas

作者：G. Rohde, A. Stange, Andreas Müller, Mirosław Behrendt, L.-P. Oloff, K. Hanff, Thies J. Albert, Petra Hein, Kai Roßnagel, Michael Bauer · 发表于：Physical Review Letters · 年份：2018 · DOI：10.1103/physrevlett.121.256401 · 被引用次数：65 · 研究领域：Laser-Matter Interactions and Applications、Advanced Fiber Laser Technologies、Advanced Chemical Physics Studies

Time- and angle-resolved photoelectron spectroscopy with 13 fs temporal resolution is used to follow the different stages in the formation of a Fermi-Dirac distributed electron gas in graphite after absorption of an intense 7 fs laser pulse. Within the first 50 fs after excitation, a sequence of time frames is resolved that are characterized by different energy and momentum exchange processes among the involved photonic, electronic, and phononic degrees of freedom. The results reveal experimentally the complexity of the transition from a nascent nonthermal towards a thermal electron distribution due to the different timescales associated with the involved interaction processes.