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Research Zernike (ZIAM) News Colloquia

Zernike Colloquium: Angel Rubio - New states of matter from a novel first principles quantum electrodynamics density functional formalism (QEDFT)

When:Th 07-02-2019 16:00 - 17:00
Where:Lecture Hall: 5111.0080

Angel Rubio

Max Planck Institute for the Structure and Dynamics of Matter

Hamburg, Germany

Center for Computational Quantum Physics (CCQ)

The Flatiron Institute

New York NY 10010, USA

Computer simulations that predict the light-induced change in the physical and chemical properties of complex systems, molecules, nanostructures and solids 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. In this talk, we show how the effects of quantum-photons can be properly included in the newly developed quantum electrodynamics density-functional formalism (QED-TDDFT). 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 in correlated matter-photon problems. We identify fundamental changes in Born-Oppenheimer surfaces, conical intersections, spectroscopic quantities, and quantum control efficiency. We also show how periodic driving of many-body systems allow to design Floquet states of matter with tunable electronic properties on ultrafast time scales.

Work done in collaboration with: H. Appel, M. Ruggenthaler, H, Hübener, U. de Giovannini, M. Sentef, N. Park, J. Flick, C. Schaefer, V. Rokaj, D. Welakuh, S. Sato, N. Tanconje-Dejean