Projects from Prof. Dr. Stefan Schumacher

Department of Physics

10 projects were found

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 Parität-Zeit (PT) Symmetrie dazu führen, dass das System reelle Eigenenergieen aufweist; diese werden ...

Duration: since 06/2021

Funded by: DFG

Mikroskopische Theorie der Ladungsträgererzeugung in konjugierten Polymeren

Halbleitende konjugierte Polymere bergen immenses Potential für Anwendungen in Optoelektronik, Photonik und Photovoltaik. In dem hier geplanten Projekt beschäftigen wir uns ausgehend von einer mikroskopischen Perspektive mit der Ladungsträgererzeugung in konjugierten Polymeren. Dabei widmen wir uns im Detail (i) der Ladungsträgererzeugung 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

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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

Spinabhängige Polaritonstreuung und rein optische Kontrolle transversaler optischer Muster in Halbleitermikrokavitäten

In diesem Projekt beschäftigen wr uns mit der Bildung und optischen Kontrolle von Mustern in kohärent getriebenen Polaritonsystemen in Halbleitermikroresonatoren. Quantenfilm basierte Halbleitermikroresonatoren zeichnen sich durch räumliche Homogenität 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