Recorded 28 March 2022. Angel Rubio of the Max Planck Institute for the Structure and Dynamics of Matter presents "Polaritonic Quantum Materials: a first principles QEDFT perspective" at IPAM's Multiscale Approaches in Quantum Mechanics Workshop. Abstract: In this talk we will pursue the question of whether it is possible to create new states of mater by utilizing light-matter hybrid states (polaritonic states). We will address whether we can realize new phases as a ground states of the matter that is different to the one the system is in vacuum. To this end we will show how the emerging (vacuum) dressed states resembles Floquet states in driven systems. A particular appeal of light dressing is the possibility to engineer symmetry breaking which can lead to novel properties of materials. Strong light–matter coupling in cavities provides a pathway to break fundamental materials symmetries, like time-reversal symmetry in chiral cavities. We will discuss the potential to realize non-equilibrium states of matter that have so far been only accessible in ultrafast and ultra-strong laser-driven materials. We illustrate the realization of those ideas in molecular complexes and 2D materials and show that the combination of cavity-QED and 2D twisted van der Waals heterostructures provides a novel and unique platform for the seamless realization of a plethora of interacting quantum phenomena, including exotic and elusive correlated and topological phases of matter. We will briefly introduce our newly developed quantum electrodynamics density-functional formalism (QEDFT) as a first principles framework to predict, characterize and control the spontaneous appearance of ordered phases of strongly interacting light-matter hybrids. Learn more online at: http://www.ipam.ucla.edu/programs/workshops/workshop-i-multiscale-approaches-in-quantum-mechanics/?tab=schedule