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X-WR-CALDESC:Events for Regensburg Center for Ultrafast Nanoscopy
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DTSTART;TZID=Europe/Berlin:20250725T141500
DTEND;TZID=Europe/Berlin:20250725T151500
DTSTAMP:20260413T011411
CREATED:20250718T102137Z
LAST-MODIFIED:20250718T103532Z
UID:3382-1753452900-1753456500@run-regensburg.de
SUMMARY:RUN Colloquium:Prof. Dr. Elmar Behrmann
DESCRIPTION:Venue: RUN auditorium 1st floor \n\n\n\nOne is the loneliest number \n\n\n\nArtificial intelligence\, or more precisely machine learning\, is not only revolutionising our daily lives\, it has also become an essential tool for science. In structural biology\, deep learning tools such as Alphafold or RoseTTAFold promise to provide protein structures at the click of a button. However\, because these tools are based on extrapolating information from existing knowledge\, they tend to underestimate the creativity of evolution in finding new applications for existing protein folds. Cryo-electron microscopy\, on the other hand\, as an image-based method\, allows proteins to be visualised at near-atomic resolution without requiring prior assumptions about protein structure\, and is therefore ideally suited to reveal such new applications for existing folds. \n\n\n\nIn my talk\, I will use three recent examples from our lab – a light-sensitive protein that helps marine worms sense the phase of the moon\, a synaptic scaffolding protein that helps our brain balance its activity\, and an immunoreceptor protein that helps a plant defend itself against pathogenic fungi – to highlight the power of cryo-EM to reveal unexpected oligomeric assemblies and resolve them to near-atomic resolution\, thereby improving our functional and mechanistic understanding of these proteins. \n\n\n\n\n\n\n\n\n\n\n\n\n\nProf. Dr. Elmar BehrmannUniversity of Cologne
URL:https://run-regensburg.de/event/run-colloquiumprof-dr-elmar-behrmann/
CATEGORIES:RUN Colloquium
ATTACH;FMTTYPE=image/jpeg:https://run-regensburg.de/wp-content/uploads/2025/07/Behrmann.jpg
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DTSTART;TZID=Europe/Berlin:20250109T140000
DTEND;TZID=Europe/Berlin:20250109T150000
DTSTAMP:20260413T011411
CREATED:20241002T072850Z
LAST-MODIFIED:20241220T085405Z
UID:3018-1736431200-1736434800@run-regensburg.de
SUMMARY:Prof. Dr. Giulio Cerullo:2D semiconductors: a platform for ultrafast photonics
DESCRIPTION:Dipartimento di Fisica\, Politecnico di Milano\, Piazza Leonardo da Vinci 32\, 20133\, Milano\, Italy \n\n\n\nLayered materials are solids consisting of crystalline sheets with strong in-plane covalent bonds and weak van der Waals out-of-plane interactions. These materials can be easily exfoliated to a single layer\, obtaining two-dimensional (2D) materials with radically novel physico-chemical characteristics compared to their bulk counterparts. The field of 2D materials began with graphene and quickly expanded to include semiconducting transition metal dichalcogenides(TMDs). 2D semiconductors exhibit very strong light-matter interaction and exceptionally intenseand ultrafast nonlinear optical response\, enabling a variety of novel applications in optoelectronics and photonics. Furthermore\, stacking 2D materials into heterostructures (HS) offers unlimited possibilities to design new materials tailored for applications. In such HS the electronic structure of the individual layers is well retained because of the weak interlayer van der Waals coupling. Nevertheless\, new physical properties and functionalities arise beyond those of their constituent blocks\, depending on the type\, the stacking sequence and the twist angle of the layers. This talk will review our recent studies on the ultrafast non-equilibrium optical response of TMDs and their HS. Using high time resolution ultrafast transient absorption (TA) spectroscopy\, we monitor the ultrafast onset of exciton formation in TMDs and the dynamics of strongly coupled phonons. Using helicity resolved TA spectroscopy we time-resolve intravalley spin-flip processes. In HS of TMDs we measure ultrafast interlayer hole transfer\, interlayer exciton formation and use two-dimensional electronic spectroscopy to dissect interlayer electron and hole transfer processes. We also show that strong exciton nonlinear interactions can lead to a complete quenching of the Rabi splitting in TMD-based microcavities. The demonstrated ultrafast switching between the strong and weak coupling regimes paves the way for the development of TMD based high speed all-optical circuits and neural networks.
URL:https://run-regensburg.de/event/grk-colloquium-prof-dr-maria-chekhova-dr-francesco-intravaia/
CATEGORIES:RUN Colloquium
ATTACH;FMTTYPE=image/jpeg:https://run-regensburg.de/wp-content/uploads/2024/10/images.jpg
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DTSTART;TZID=Europe/Berlin:20240705T141500
DTEND;TZID=Europe/Berlin:20240705T154500
DTSTAMP:20260413T011411
CREATED:20240222T091317Z
LAST-MODIFIED:20240619T142831Z
UID:1616-1720188900-1720194300@run-regensburg.de
SUMMARY:RUN Colloquium: Plasmonic Twistronics: Ultrafast Vector Microscopy
DESCRIPTION:Here we introduce a new technique\, time-resolved vector microscopy\, that enables us to compose entire movies on a sub-femtosecond time scale and a 10 nm scale of the electric field vectors of surface plasmon polaritons. Depending on the shape and geometrical phase\, in combination with the helicity of the excitation beam\, topological plasmonic quasiparticles are created: skyrmions\, merons\, as well as quasicrystalline excitations. We observe their complete field vector dynamics at subfemtosecond time resolution. We expand the concept also to plasmonic twistronics\, where we can identify skyrmion bags. \n\n\n\n\n\nProf. Dr. Harald Gießen
URL:https://run-regensburg.de/event/haraldgiesen/
CATEGORIES:RUN Colloquium
ATTACH;FMTTYPE=image/jpeg:https://run-regensburg.de/wp-content/uploads/2024/02/gh4_1025.jpg
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