Projects from Prof. Dr. Stefan Schumacher
Physics of periodic and quasi-periodic polariton systems
Light-matter interaction has attracted a great deal of attention in modern physics and material sciences. Many unique and unconventional properties have been reported on the journey to the efficient control of light (or photons). A light-matter coupled state of particular current interest is the exciton-polariton, a quasiparticle composed of a ...
Duration: 01/2023 - 12/2026
Funded by: DFG
TRR 142 - On-demand ideal photon pair generation for entanglement swapping at telecom frequencies (C09*)
The goal of this project is the demonstration of on-demand ideal photon pair generation for entanglement swapping at telecom frequencies employing quantum dots embedded in circular Bragg grating cavities. The InAs quantum dots in an InxGayAl1-x-yAs-matrix are grown by molecular beam epitaxy and the circular Bragg grating cavity will allow to tune ...
Duration: 01/2022 - 12/2025
Funded by: DFG
PT symmetry and non-Hermitian physics in polariton condensates in semiconductor microcavities
Nicht-hermitesche physikalische Systeme erhalten immer mehr Aufmerksamtkeit, da sie viele einzigartige und unkonventionelle Eigenschaften zeigen. In Systemen, die durch einen nicht-hermiteschen Hamiltonoperator beschrieben werden, kann Parit?t-Zeit (PT) Symmetrie dazu führen, dass das System reelle Eigenenergieen aufweist; diese werden ...
Duration: 06/2021 - 12/2024
Funded by: DFG
Mikroskopische Theorie der Ladungstr?gererzeugung in konjugierten Polymeren
Halbleitende konjugierte Polymere bergen immenses Potential für Anwendungen in Optoelektronik, Photonik und Photovoltaik. In dem hier geplanten Projekt besch?ftigen wir uns ausgehend von einer mikroskopischen Perspektive mit der Ladungstr?gererzeugung in konjugierten Polymeren. Dabei widmen wir uns im Detail (i) der Ladungstr?gererzeugung durch ...
Duration: 03/2017 - 12/2021
Funded by: DFG
Theory of functional photonic structures
The precondition for a Heisenberg Programme funding is high scientific quality and originality of the research project at international level and suitability for further qualification as a university teacher. Applicants need to meet all the requirements for appointment to a permanent professorship.The aim of this programme is to enable outstanding ...
Duration: 04/2015 - 12/2021
Funded by: DFG
Transregional Collaborative Research Center TRR 142 - Tailored Nonlinear Photonics: From Fundamental Concepts to Functional Structures
The central goal of this CRC is the exploration, development, and engineering of future nonlinear photonics, which uses state-of-the-art technological capabilities for the exploration of new physics and devices based on tailored strong nonlinearities and genuine quantum effects. Our research harnesses tailored solid-state systems and bridges the ...
Duration: 04/2014 - 12/2025
Funded by: DFG
TRR 142 - Cavity enhanced two-photon physics with semiconductor quantum dots (A03)
This project is focused on two-photon processes in semiconductor microcavities with embedded quantum dots. The project work will be concentrated on the down-conversion from the biexciton state via an optically induced virtual state which leads to a cavity enhanced single photon emission. Our joint theoretical and experimental quantum optical study ...
Duration: 04/2014 - 12/2021
Funded by: DFG
TRR 142 - Nonlinear quantum process tomography and photonics of microcavity polaritons (A04)
In this project, we set out to realize a complete description of nonlinear quantum processes involving microcavity polaritons. Such a description is given by a process matrix that maps every possible input state fed to the system to its corresponding output state. To construct this matrix, we will combine advanced spectroscopic techniques and ...
Duration: 04/2014 - 12/2025
Funded by: DFG
Spinabh?ngige Polaritonstreuung und rein optische Kontrolle transversaler optischer Muster in Halbleitermikrokavit?ten
In diesem Projekt besch?ftigen wr uns mit der Bildung und optischen Kontrolle von Mustern in koh?rent getriebenen Polaritonsystemen in Halbleitermikroresonatoren. Quantenfilm basierte Halbleitermikroresonatoren zeichnen sich durch r?umliche Homogenit?t in der Quantenfilmebene aus. Anregung mit einem ebene Welle Pumpstrahl in senkrechtem Einfall ...
Duration: 01/2011 - 12/2021
Funded by: DFG
RTG 1464: Micro- and Nanostructures in Optoelectronics and Photonics
Optoelectronics and photonics are key technologies of the 21st century that provide products for many areas of life, including communication, traffic, medicine, culture and entertainment. While communication via optical fibers is pretty established, products like liquid crystal displays or semiconductor laser diodes are currently subject of a ...
Duration: 01/2008 - 12/2017
Funded by: DFG