2018_EJRNL_PP_G__ROHDE_1.pdf
Terbatas Ratnasari
» ITB
Terbatas Ratnasari
» ITB
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.