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Date: Friday, August 2, 2019
Time: 3:00 PM
Place: Ingrid Daubechies Auditorium, 162 Fifth, 2nd floor
Speaker: Angel Rubio, Distinguished Research Scientist, Center for Computational Quantum Physics Director, Max Planck for the Structure and Dynamics of Matter, Hamburg, Germany
Title: Cavity and Floquet-Engineered new states of matter
Abstract: Computer simulations that predict the light-induced change in the physical and chemical properties of complex systems usually ignore the quantum nature of light. Recent experiments at the interface between materials science and quantum optics have uncovered situations where both the molecular system and the photon field have to be treated in detail. Here we will show the effects of quantum-photons can be properly included in the newly developed quantum electrodynamics density-functional formalism (QEDFT). We provide an overview of how well-established concepts in the fields of quantum chemistry and material sciences have to be adapted when the quantum nature of light becomes important and present the novel framework we have developed of quantum electrodynamics density-functional formalism (QEDFT). We illustrate the method to molecular complexes identifying fundamental changes in the Born-Oppenheimer surfaces, conical intersections (chemical reactivity and energy transfer and spectroscopy. We also show how periodic driving of many-body interacting 2D systems allow to design Floquet states of matter with tunable electronic properties on ultrafast time scales (and cavity induced-topology). This work paves the road for the development of what can be coined as QED-materials and QED-chemistry.