Non-equilibrium dynamics of the phonon system (B04)

• Subject Area: Experimental Condensed Matter Physics
• Term: from 2016 to 2024
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 278162697

The excitation, decay, and transport of phonons in crystalline films and at their surfaces upon an optical excitation will be studied by ultrafast electron diffraction with femtosecond temporal resolution. We focus on the manipulation of electron phonon coupling through variation of electronic states, strain state, surface and interface roughness and thus control the vibrational excitation of lattice through either formation of squeezed state, e-ph coupling through surface state, or anharmonic ph-ph coupling. We force violation of equipartition in the phonon system through switching from diffusive to ballistic phonon transport.

• DFG Programme: Collaborative Research Centres
• Subproject of: SFB 1242: Non-equilibrium dynamics of condensed matter in the time domain
• Applicant Institution: Universität Duisburg-Essen
• Project Head: Professor Dr. Michael Horn-von Hoegen