Thema der Dissertation:
Exploiting Collective States in Superlattices
Exploiting Collective States in Superlattices
Abstract: Collective states with their fascinating optical properties occur through the coupling of dipole moments. The coupling of the dipoles leads to an overall optical response that varies strongly from the monomer. Dipole coupled systems are manifold systems with optical properties that are interesting for a variety of optoelectronic applications, solar cells, and catalytic reactions. The lattices range from atomic and molecular lattices up to plasmonic structures and can vary in their dimensionality. Depending on the approach, dipole coupled systems can easily be adapted to the relevant requirements, such as excitation energy.
In my thesis I investigated collective states in one- and two-dimensional molecular lattices. These states are highly emissive, have narrow line widths as well as short radiative life times. With a microscopic real space dipole model, I showed that excitations of two-dimensional molecular monolayers are robust against various forms of disorder. I realized the growth of two-dimensional monolayers with a perylene derivate and showed that the collective states also exist on materials that provide a large radiative decay channel. Further I studied collective states in one-dimensional molecular aggregates, namely in molecule chains encapsulated in boron nitride nanotubes. I verified that the collective exitonic states of single- and multi-file chains show an enormous shift to lower energies that is not captured by the model of interacting dipoles.
In my thesis I investigated collective states in one- and two-dimensional molecular lattices. These states are highly emissive, have narrow line widths as well as short radiative life times. With a microscopic real space dipole model, I showed that excitations of two-dimensional molecular monolayers are robust against various forms of disorder. I realized the growth of two-dimensional monolayers with a perylene derivate and showed that the collective states also exist on materials that provide a large radiative decay channel. Further I studied collective states in one-dimensional molecular aggregates, namely in molecule chains encapsulated in boron nitride nanotubes. I verified that the collective exitonic states of single- and multi-file chains show an enormous shift to lower energies that is not captured by the model of interacting dipoles.
Zeit & Ort
30.08.2024 | 10:00
Hörsaal A (1.3.14)
Fachbereich Physik, Arnimallee 14, 14195 Berlin