Figure 2
From: Phonon anharmonicities and ultrafast dynamics in epitaxial Sb2Te3
(a) Sketch of the ultrafast THz-FTS setup illustrating the working principle of spectral mapping of transient THz absorption in thin films employing single cycle coherent THz pulses from BESSY II. (b) Structure model of Sb2Te3 and marked directions of the electric field direction with respect to the c-axis. (c) Time traces of the total THz transmittance change in 80 nm epitaxial Sb2Te3 films upon 800 nm fs-laser excitation with different fluences (low fluence = 0.6 mJ/cm2, high fluence = 3.0 mJ/cm2).
