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 is "Physikerin der Woche"
The project „Physikerin der Woche“ of the German Physical Society (DPG) highlights every week women in physics in Germany or German women in physics abroad. This week (March 22-28) Doris is “Physikerin der Woche” as presented on the DPG-Website and the social media accounts Twitter and Instagram of the “Physikerinnen”.
'Semiconductors for breakfast' ist back
March 12, 2021
March is usually the time of the spring meeting of the German Physical Society (DPG). This year we only have online events. Starting from March 15 the semiconductor division presents the online lecture series “Semiconductors for breakfast”. Each day at breakfast time we host a talk about an exciting topic in semiconductor physics. The talks shall be accessible to a general audience and be addressed to students as well. The participation is possible without registration via the online links at the website.
New publication on long-lived coherence in charged quantum dots
10 February 2021
If an electron-hole pair is excited in a quantum dot, a trion forms. Analogous to excitons, trions can either be in their ground state or in any excited state. We generate a superposition of excited trion states and show that this superposition survives a fast relaxation and is surprisingly long-lived. We can detect the superposition in optical pump-probe experiments which were performed in the AG Leitenstorfer from Konstanz. The experiments agree excellently with our theoretical calculations. Thereby, the superposition is visible as dynamical feature and can be controlled via the excitation conditions.
Read more in the publication.
New publication on the preparation of dark excitons in quantum dots
January 12, 2021
In quantum dots several excitons (electron-hole pairs) can be optically excited, while other excitons do not couple to the light field. These dark excitons have a long lifetime, which makes their preparation interesting. In this paper we propose a method to prepare the dark ground-state exciton. Our method relies on the excitation with a longitudinal light field and valence band mixing of higher excited states. We show that our method should enable an efficient dark state preparation in many quantum dots.
This work was done together with Guillermo Quinteiro from Argentina.
Read more in the publication.
Congratulations to Thomas Bracht
January 7, 2021
Congratulations to Thomas Bracht for completing his master studies. In his master’s thesis he worked on “Machine learning approach to quantum control in optically driven few-level systems”. Using an artificial neutral network he was able to find new protocols to prepare quantum states in quantum dots. He explored the limits of using machine learning and showed that sometimes a very unreasonable outcome is found, but that machine learning can also be very helpful to study quantum systems. This month Thomas starts his PhD studies and we wish him all the best!
... you can find more news in the archive.