First-principles calculations of phonons are often based on the adiabatic approximation and
on Brillouin-zone samplings that might not always be sufficient to capture the subtleties of …

We present an ab initio computational approach for the calculation of resonant Raman
intensities, including both excitonic and nonadiabatic effects. Our diagrammatic approach …

We develop a general, fully quantum mechanical theory of Raman scattering from first
principles in terms of many-body correlation functions. In order to arrive at expressions that …

The development of novel optoelectronic applications crucially depends on the detailed
understanding of light--matter interaction in the candidate materials. From a theoretical point …

Quantised lattice vibrations (ie, phonons) in solids are robust and unambiguous fingerprints
of crystal structures and of their symmetry properties. In metals and semimetals, strong …

State-of-the-art approaches to calculate the electron-phonon and the phonon-electron self-
energy are based on a mean-field approximation for the interacting electronic system. This …