Third-Party Fundings

For more information, please visit: NanoQIQO

The objective of the present project is to investigate excited states in van der Waals heterostructures, including Moiré trapping effects in the presence of strain and electric fields. The calculated excited states include excitons, trions, biexcitons, and higher-charged excitons. The underlying theory is atomistic and involves calculations of up to 3,000 atoms on the *ab initio* DFT level and up to 50,000 atoms on the semi-empirical (AEP) level (AEPs were developed during the first funding period). Structural relaxation, including reconstructions, is carried out with our classical force field (developed during the first funding period). The single-particle results are subsequently used in our CI method to ultimately obtain the mentioned many-particle excitations (excitons, trions, and biexcitons). A significant portion of the work will be conducted in collaboration with focus program groups listed in a specific work package.

For more information, please visit: SPP2244

The project "4Photon" deals with the technical realization of components used in the wider context of quantum information, including single-photon sources, sources of entangled photons and storage of quantum bits (the analogue of a bit in the quantum world). Working groups from eight European universities as well as three companies are involved in “4Photon” (see the project's website). The University of Hamburg is represented by two working groups: Our working group aims at theoretically analyzing possibilities for the development of entangled photons and the short-term dynamics of excited states. The group of Prof. Dr. Wolfgang Hansen aims at refining the method for the growth of semiconductor quantum dots with tunable features for applications in quantum optics and information. The share of the University of Hamburg in the funding amount of 3.9 million euros is about half a million euros.

This project is a joint effort of experiment and theory. The experiments are performed in the group of Prof. Janina Maultzsch at the university of Erlangen-Nürnberg and at the Hamburg university in the group of Prof. Holger Lange  Our principal goals for the theory part of this project are:

• To obtain an accurate method for the quantification of the exciton-phonon coupling from measured resonant Raman spectra
• To apply this method to current problems in core/shell and alloyed nanocrystals

Functionalities are at the heart of the cluster of excellence „CUI: Advanced Imaging of Matter“. Atoms bind together and form solids, molecules interact and react - new functionalities emerge with increasing complexity and growing system size. 160 scientists from different disciplines such as physics, chemistry, and structural biology have joined forces to observe, understand, and control these processes. Thereby teams of Universität Hamburg cooperate with scientists of the Deutsche Elektronen-Synchrotron (DESY), the Max Planck Institute for the Structure and Dynamics of Matter (MPSD), and the European XFEL GmbH (XFEL).