© Doris Reiter

updated: August 18, 2021

Ultrafast Optics in Nanostructured Solids

Welcome to the AG Reiter

Our research group studies the theoretical modelling of dynamics of nanostructured solids on ultra short time and length scales. An introduction to our research can be found here. My CV and further information can be found in the research portal of the WWU Münster.

We have several collaborations within the WWU Münster, in particular with the AG Kuhn and the AG Schuck and with other theoretical and experimental groups all over the world, among others with Martin Axt from Bayreuth (Germany), Pawel Machnikowski from Wrocław (Poland), Sang Soon Oh from Cardiff (UK), Richard Warburton from Basel (Schwitzerland) and Gregor Weihs from Innsbruck (Austria).

We are always happy to talk about our work. If you are interested in a bachelor or master thesis in our group, please contact us via E-Mail and make an appointment.
Doris Reiter
| | Phys. Rev. Lett. 127, 100402 (2021)
© M. Cosacchi

New publication on the validity of the quantum regression theorem

The quantum regression theorem (QRT) from quantum optics can be used to describe optical signals of an open quantum system. It is an approximate method, which can be used to estimate the influence of phonons on the properties of photons that are emitted by a quantum dot. In the paper we compare the results obtained within the QRT with ones from a numerically exact path integral formalism. We demonstrate that the QRT can overestimate the influence of the phonons, which is very important for quantum communication, where photons should have almost ideal properties. The work was performed in collaboration with AG Axt from Bayreuth.

AG Reiter
© M. Neumann/T. Bracht

New publication on the usage of the Stark effect for dark exciton preparation

When a few-level system is driven by a strong laser pulse, the energy eigenstates change. This is called Stark effect. In the publication we show that the Stark effect can be used to deterministically address dark excitons in a quantum dot being in a magnetic field. Phonons do not significantly influence the preparation protocols. We also discuss the properties of the laser pulses that should be used for the Stark effect and whether these pulses can be realised in the lab. Dark excitons can play a decisive role to create entangled photons from quantum dots.

The work was performed within the D-A-CH project “Advanced Entanglement from Quantum Dots” in collaboration with AG Axt from Bayreuth and AG Weihs from Innsbruck.

AG Reiter
© F. Lengers

Congratulations to Frank Lengers

Congratulations to Dr. Frank Lengers to his PhD! This year Frank has handed in his thesis „Spatially resolved quantum kinetics of optically excited carriers in low-dimensional semiconductors“ and successfully defended and published it. He will be awarded his PhD in the official ceremony on July 23rd. During his PhD Frank has written and contributed to 10 publications. His talks at conferences and seminars were always very well received and he won two poster prices at NOEKS 2020. Frank was also active in teaching. Everybody was happy to meet and discuss with Frank at the coffee machine, which was always stocked up and clean thanks to Frank’s care!

We wish Frank all the best for his future!

D. Reiter
| | Master thesis finished
© Miriam Neumann

Congratulations to Miriam Neumann

Congratulations to Miriam Neumann for finishing her master thesis. In her work, Miriam shows how to prepare dark excitons in a quantum dot in a magnetic field using the optical Stark effect. She derives and analysis the conditions to successfully prepare the dark exciton. Miriam further discusses that the phonons do not influence the preparation in most of the cases. Dark excitons in quantum dots can be useful for photon storage or to enhance the generation of time-bin entangled photons.

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