Terahertz-driven nonlinear phonon dynamics

Matthias C. Hoffmann

doi:10.1117/12.2569224

21 August 2020 Terahertz-driven nonlinear phonon dynamics

Matthias C. Hoffmann

Proceedings Volume 11499, Terahertz Emitters, Receivers, and Applications XI; 114990H (2020) https://doi.org/10.1117/12.2569224
Event: SPIE Optical Engineering + Applications, 2020, Online Only

Abstract

Intense Terahertz (THz) pulses offer a unique way to manipulate matter on a sub-picosecond timescale. Their strong electric and magnetic field components efficiently couple to low-energy degrees of freedom like optical phonons or magnons while we can simultaneously use ultrafast probe techniques to monitor changes in the sample with femtosecond resolution. This allows us to study novel nonequilibrium phases and the response of matter to strong transient fields. I will give a brief overview over THz experiments at the LCLS and how we can probe changes in properties like ferroelectricity, magnetism or orbital order with femtosecond x-ray pulses. I will specifically focus on nonlinear phonon dynamics and discuss recent results on SrTiO3 where we observed strong nonlinearity of the soft phonon mode and the transfer of energy to higher frequency vibrational modes.

Conference Presentation

Citation Download Citation

Matthias C. Hoffmann "Terahertz-driven nonlinear phonon dynamics", Proc. SPIE 11499, Terahertz Emitters, Receivers, and Applications XI, 114990H (21 August 2020); https://doi.org/10.1117/12.2569224

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