Project B09

Transport properties of electron-phonon coupled systems

This project aims at elucidating the interplay between the electronic and phononic sector in transport problems and in the energy-transfer processes between these subsystems. We employ model-based computational simulations to study polaronic charge and energy transport in spatially inhomogeneous systems, dynamical quantities such as the optical conductivity and spectral functions, and the real-time dynamics of polaronic charge carriers. Several manifestations of spatial inhomogeneity will be considered, including interfaces, charge-density wave states, disorder, and transient density variations resulting from different relaxation times of electrons versus phonons.

In our recent study Stolpp et al. Phys. Rev. B 101, 035134 (2020), we investigate the decay of charge density waves states in the one-dimensional Holstein modelin various parameter regimes (see part (a) of the figure for a sketch). The lower panel shows the phase diagram of the model at half filling (obtained in other studies, see references in our publication).