Physical Colloquia in Summer Term 2022

Prof. Dr. Tommaso Calarco

Building the second quantum revolution: quantum control for quantum technologies

Dr. Christin David Image: Dr. Christin David

Dr. Christin David
Institute of Condensed Matter Theory and Optics

Referat within the framework of Habilitation

Hybrid Nanostructures Systems beyond classical Electrodynamics: Mesoscale Dynamics and Nonlinear Effects

A key task in modeling nanoscale systems on the verge of the quantum regime is the integration of the quantum nature of atoms, electrons and molecules and their interaction with electromagnetic fields, the interplay of optically excited nanocrystals with complex energy transfer mechanisms stemming from electron transport. Mesoscale electron dynamics and rough surface morphologies are not typically captured in standard electrodynamics. Though such effects are highly localized, optical coupling can lead to an impact on a larger device via retardation and lattice effects. We investigate theoretically the optial properties of hybrid metal, dielectric and ionic largely regular nanostructures in the presence of nanosized features such as gaps and thin walls in tubular structures. We focus hereby on two aspects: (i) nonclassical effects stemming from the quantum nature of freely moving charges and (ii) nonlinear optical response. The overall aim is to realistically describe complex nanoparticle distributions and ultrathin multilayers with reliable and rapid methods of computational nanophotonics while extending its scope towards multiphysics aspects beyond classical electrodynamics with applications in sensing, spectroscopy and light harvesting devices.

Dr. habil. Olaf Stenzel (Fraunhofer-Institut für Angewandte Optik und Feinmechanik, Jena)

Referat within the framework of Habilitation

Standardmodell der Dünnschichtoptik: Stolpersteine, Anpassungen und Chancen

Dr.  Sabine Körbel
Institute of Condensed Matter Theory and Optics

Referat within the framework of Habilitation

Polarons at ferroelectric domain walls in BiFeO3

Ferroelectric domain walls are atomically narrow planes that can behave very differently from the surrounding bulk ferroelectric material. For example, the domain walls in many ferroelectrics can collect and conduct charge carriers despite the insulating nature of the host material. Domain walls can be created, moved, and removed again in a controlled way, thus they can be used to tailor the electronic properties of the ferroelectric. Charge carriers that accumulate at domain walls may lead to metallic or semiconducting charge transport characteristics depending on whether they are delocalized or form self-trapped small polarons. The latter may be detected, for example, as deep levels within the band gap in optical absorption or photoluminescence spectra. First-principles materials modeling can help to interpret experimental findings and make predictions where experimental data are not available. In my talk I will present insights into polaron formation at ferroelectric domain walls in BiFeO3 gained from first-principles modeling.

Prof. Dr. Dario Polli

2 p.m.  to 6 p.m.

Symposium for the 50th birthday of Prof. Dr. Holger Gies

Prof. Dr. Reinhard Genzel
Winner of the Nobel Prize in Physics

Max Planck Institute for Extraterrestrial Physics, Garching

Public Evening Lecture within the Conference "Further Training for Teachers in Astronomy"

A 40-year Journey / Eine vierzigjährige Reise