External Talk - Christian Schäfer - Ab initio QED: Combining strong light-matter interaction with realistic materials and its application to chemistry

Dec 13
13. December 2021 14:00 - 16:00
 

Speaker:

Christian Schäfer – Chalmers University of Technoloy (Sweden)

Title:

Ab initio QED: Combining strong light-matter interaction with realistic materials and its application to chemistry

Abstract:

The alchemical dream of altering a given material on demand into something desirable is at the very heart of chemistry. Cavity environments provide a novel handle to non-intrusively control materials and chemistry as demonstrated by recent experimental work. A theoretical description of those systems is challenging, to put it mildly. The self-consistent interaction between complex electromagnetic environments and realistic materials gave birth to a new discipline, sometimes referred to as ’ab initio QED’, on the interface of condensed matter and quantum optics.

I will provide an introduction into this newly emerged field, discuss important conditions [1], highlight its strength, current limitations and future prospects. In a first step, a non-perturbative photon-free framework [2] will be introduced that provides access to strong and even deep ultra-strong-coupling phenomena by expressing quantum fluctuations of the field as fluctuations of the currents. Subsequently, the left over classical Maxwell fields can be efficiently embedded into state-of-the-art ab initio libraries [3]. From this perspective, the current state of ab initio QED will be briefly reviewed. Finally, I will present applications to chemistry, demonstrating modifications in weak intermolecular interactions [4] and the speed of chemical reactions [5] by means of an external cavity.

More information at

https://www.tfkp.nat.fau.de/veranstaltungen/abstracts-group-seminar/#collapse_0