The interplay of light and matter gives rise to intriguing cooperative effects in quantum many-
body systems. This is even true in thermal equilibrium, where the electromagnetic field can …

We present a deterministic algorithm for the efficient evaluation of imaginary-time diagrams
based on the recently introduced discrete Lehmann representation (DLR) of imaginary-time …

We discuss the evaluation of the integrals for intermediate-order diagrams in the self-
consistent strong-coupling expansion on the Keldysh contour using Tensor Cross …

We investigate the control of interacting matter through strong coupling to a single
electromagnetic mode, such as the photon mode in a Fabry-Perot or split-ring cavity. For this …

In several cases, open quantum systems can be successfully described using master
equations relying on Born-Markov approximations, but going beyond these approaches has …

The study of nonequilibrium phenomena in interacting lattice systems can provide new
perspectives on correlation effects, and information on metastable states of matter. Mott …

Time-resolved X-ray absorption can reveal the dynamical screening of the local Coulomb
interaction in strongly correlated photo-excited materials. Here, we focus on the theoretical …

Recent advances in the study of quantum cooperative effects in coupled light-matter systems
open up unprecedented pathways to manipulate the properties of materials without external …