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 which 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 non-thermal towards a thermal electron distribution due to the different timescales associated with the involved interaction processes.
@article{arxiv.1804.01403,
title = {Decoding the ultrafast formation of a Fermi-Dirac distributed electron gas},
author = {Gerald Rohde and Ankatrin Stange and Arne Müller and Marcel Behrendt and Lars-Philip Oloff and Kerstin Hanff and Thies Albert and Petra Hein and Kai Rossnagel and Michael Bauer},
journal= {arXiv preprint arXiv:1804.01403},
year = {2018}
}
Comments
11 pages, 8 figures; details on the time resolution, further information to Fig. 3, a goodness-of-fit analysis, and a few improvements added