Non-equilibrium dynamics in solids probed by terahertz fields (B08#)

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In this project we will use ultrafast terahertz (THz) spectroscopy to study the non-equilibrium dynamics of electrons and the lattice in solids. Ultrafast THz spectroscopy is a femtosecond-laser based, all-optical method, ideally suited to probe the conductivity of materials, including its ultrafast dynamics. In the first funding period we will concentrate on the two key topics of the electric conductivity dynamics. 1) Photoexcited pnictogen metals Bi, Sb and As undergoing the ultrafast photoinduced structural phase transition; 2) Sub-100 fs dynamics of hot electron population in graphene, undergoing the primary thermalization process; and the effect of direct lattice excitation of graphene on its conductivity.