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Physics Colloquium: Johannes Flick, Ph.D., First-principle approaches to strong light-matter coupling in molecular and extended systems

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Physics Colloquium: Johannes Flick, Ph.D., First-principle approaches to strong light-matter coupling in molecular and extended systems
When Feb 19, 2020
from 04:00 PM to 05:00 PM
Where MR418N
Contact Name
Contact Phone 212-650-5625
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First-principle approaches to strong light-matter coupling in molecular and extended systems

Johannes Flick, Ph.D.
Associate Research Scientist
Center for Computational Quantum Physics (CCQ), Flatiron Institute
New York, NY

 

Abstract

In recent years, research at the interface of material science, chemistry, and quantum optics has surged and now opens new possibilities to study light-matter interactions at different limits. Combining theoretical concepts from these fields presents an opportunity to create a predictive theoretical and computational approach from first principles to describe correlated electron-nuclear-photon dynamics on the same quantized footing.

 

In this talk, I discuss how density-functional theory can be generalized to quantum-electrodynamical density-functional theory (QEDFT) and show how new exchange-correlation potentials arise. I discuss the linear-response theory for QEDFT to access excited state properties of such systems and the emerging ab initio lifetimes and how losses can be included. By considering electrons, nuclei and photons on the same quantized footing, we find cavity-modulated molecular motion of molecules in optical cavities, as well as new light-matter correlated observables for a new type of spectroscopy. Further, we use this novel framework to study how chemical reactivity is altered in this regime, by studying the modification of potential-energy surfaces under strong-light matter coupling.

 

Beyond molecular systems, I will discuss how strong light-matter coupling can be used to make nonlinear phonon processes more efficient and discuss first-principle methods to characterize single-photon emitters.

 

Our work opens an important new avenue in introducing ab initio methods to the nascent field of strong light-matter interactions and demonstrates the novel abilities to alter material properties and open new chemical reaction pathways.

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Bio

Dr. Flick earned his Ph.D. in theoretical physics from the Fritz Haber Institute and the Humboldt University in Berlin, and his Diploma in Physics from the Karlsruhe Institute of Technology. Before joining CCQ, Johannes was a postdoctoral research at the Max Planck Institute for the Structure and Dynamics of Matter in Hamburg and a Postdoctoral Fellow at Harvard University.

Dr. Flick’s research is focused on light-matter interactions on a microscopic level in particular in the strong-coupling regime. He is interested in both the development of new computational methods to describe these regimes, e.g. quantum-electrodynamical density-functional theory, as well as their applications in catalysis, spectroscopy, and quantum-information processing.

https://scholar.google.com/citations?user=nyp2T-oAAAAJ&hl=en