Vibrations in amorphous solids (C06)

• Subject Area: Statistical Physics, Nonlinear Dynamics, Complex Systems, Soft and Fluid Matter, Biological Physics
• Term: since 2021
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 425217212

Fluctuations and dissipation are coupled close to thermal equilibrium but can originate from other sources as well, with disorder causing coupling of modes and decay of waves via scattering. C06 studies this origin of the characteristic vibrational anomalies in low-temperature glass (e.g. Rayleigh damping of sound, boson peak excess in the density of states, diffusive heat transport in harmonic systems, tunneling two level states) using Euclidean random matrix (ERM) models. Field theory approaches and exact matrix diagonalization are employed to obtain excitation spectra and thermal transport in order to validate the ERM approach to disordered solids.

• DFG Programme: Collaborative Research Centres
• Subproject of: SFB 1432: Fluctuations and Nonlinearities in Classical and Quantum Matter beyond Equilibrium
• Applicant Institution: Universität Konstanz
• Project Head: Professor Dr. Matthias Fuchs