Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 68: Focus Session: Non-equilibrium Dynamics in Light-driven Materials: Theory Meets Experiment

O 68.5: Hauptvortrag

Mittwoch, 22. März 2017, 12:30–13:00, TRE Phy

Ultrafast spin interactions revealed with terahertz radiation — •Tobias Kampfrath — Fritz Haber Institute of the Max Planck Society, Berlin, Germany

The terahertz (THz) frequency range is attracting increasing interest for both applied and fundamental reasons. First, bit rates in current information technology may soon approach the THz range. Second, its low photon energy (4.1 meV at 1 THz) makes THz radiation an excellent probe and stimulus of many fundamental excitations of solids, for instance phonons and Cooper pairs. This talk considers experiments showing that THz pulses are also a very useful and versatile tool to reveal spin interactions on the time scales of elementary relaxation processes. Examples include (i) the ultrafast transfer of energy and angular momentum between phonons and the ordered electron spins of the textbook ferrimagnet yttrium iron garnet (YIG) as well as (ii) the femtosecond transport of magnons across the interface of the spin Seebeck bilayer system YIG/Pt.