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X-WR-CALDESC:Events for Regensburg Center for Ultrafast Nanoscopy
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DTSTART;TZID=Europe/Berlin:20250109T140000
DTEND;TZID=Europe/Berlin:20250109T150000
DTSTAMP:20260421T141926
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
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20250109T161500
DTEND;TZID=Europe/Berlin:20250109T170000
DTSTAMP:20260421T141926
CREATED:20241108T100255Z
LAST-MODIFIED:20241220T085740Z
UID:3083-1736439300-1736442000@run-regensburg.de
SUMMARY:Young Colloquium:Umgang mit Trends in der Naturwissenschaft - Perspektive des Quantum Computing
DESCRIPTION:Prof. Dr. Rainer BlattUniversität Innsbruck \n\n\n\nQuantentechnologien bieten das Potenzial für verbesserte Kommunikation\, Metrologie\, Simulationen und Berechnungen. In diesem Vortrag werden die grundlegenden Funktionsprinzipien der Quanteninformationsverarbeitung kurz vorgestellt und über den Stand der Technik des Innsbrucker Quantencomputers mit gespeicherten Ionen berichtet. Die Rechenkunst mit Hilfe der Quantenphysik wird anhand von Quantensimulationen illustriert\,die Wege für eine neue Informationsverarbeitung aufzeigen. Ein kommerziell erhältlicher NISQ-Quantenprozessor wurde von AQT entwickelt und steht bereits für industrielle Anwendungen zur Verfügung.
URL:https://run-regensburg.de/event/young-colloquiumumgang-mit-trends-in-der-naturwissenschaft-perspektive-des-quantum-computing/
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20250117T140000
DTEND;TZID=Europe/Berlin:20250117T154500
DTSTAMP:20260421T141926
CREATED:20241002T073107Z
LAST-MODIFIED:20250109T110848Z
UID:3023-1737122400-1737128700@run-regensburg.de
SUMMARY:GRK Colloquium: Prof. Dr. Rainer Hillenbrand & Dr. Alex Weber-Bargioni
DESCRIPTION:14:00 hProf. Dr. Rainer Hillenbrand:Optical near-field nanoscopyNanoscience research center CIC nanoGUNE in San Sebastian \n\n\n\nBy recording the radiation scattered by a laser-illuminated atomic force microscope tip\, imaging and spectroscopy with nanoscale spatial resolution can be achieved in the broad spectral range from visible to terahertz frequencies. This talk will provide an overview of the technique and discuss some of our recent applications in materials science and polariton imaging. \n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n15:15 hDr. Alex Weber-Bargioni:Controlling and Protecting Quasiparticles in 2-D Quantum MaterialsLawrence Berkeley National Laboratory		 \n\n\n\nIn this presentation\, we explore how new types of particle-like excitations\, known as quasiparticles\, can be controlled and stabilized within ultra-thin materials—so-called 2-D solids—by creating carefully designed atomic hetero structures. Quasiparticles are not fundamental particles like electrons or protons\, but instead arise from the complex interactions between particles in a solid. They include phenomena such as excitons (bound states of electrons and holes)\, superconducting states\, and polaritons (hybrids of light and matter)\, as well as more exotic systems like Tomonaga-Luttinger liquids.  \n\n\n\n\n\n\n\n\n\n\n\nEach of these quasiparticles emerges due to the unique symmetries of the crystal structure.By engineering precise atomic-scale patterns (heterostructures) within 2-D materials\, we can not only create new types of quasiparticles but also protect and manipulate them for potential applications. For instance\, heterostructures that confine matter in zero\, one\, or two dimensions allow us to control these emergent properties with unprecedented precision. In the first part of my talk\, I will focus on excitons—quasiparticles formed by electron-hole pairs. We have investigated excitons in stacks of the 2-D materials WS₂ and WSe₂\, which are promising candidates for next-generation quantum technologies. These stacks potentially host Bose-Einstein Condensates\, a state where excitons behave like a collective whole. By coupling these excitons to nanoscale light traps (plasmonic cavities)\, we have been able to study how they emit light\, particularly “dark excitons\,” which don’t normally emit photons. Additionally\, we provide evidence of excitons traveling coherently over distances when coupled to plasmons\, forming a new hybrid quasiparticle called a plexciton.In the second part of the talk\, I will explore defects in 2-D materials that act as quantum emitters\, which are critical for applications like quantum sensing. Using a high-precision technique called photo Scanning Tunneling Microscopy (photo-STM)\, we examine how tiny imperfections in the crystal structure of MoSe₂ and WS₂—such as missing atoms—create unique energy states within the material’s band structure. These defects can emit single photons\, which is a key requirement for quantum technologies. We have also shown how replacing individual atoms in the structure with elements like carbon or cobalt creates well-defined systems similar to color centers in diamonds\, opening the door to new sensing and computational devices.Finally\, I will discuss how certain 1-D defects in 2-D materials—mirror twin boundaries—act as atomically thin conductors\, which display a remarkable transition into a quantum liquid state at low temperatures. These systems give us new insights into highly correlated electron states\, including superconductivity. \n\n\n\n \n\n\n\nVenue: RUN auditorium
URL:https://run-regensburg.de/event/grk-colloquium-prof-dr-rainer-hillenbrand-dr-alex-weber-bargioni/
CATEGORIES:GRK Colloquium
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20250120T161500
DTEND;TZID=Europe/Berlin:20250120T174500
DTSTAMP:20260421T141926
CREATED:20241108T100757Z
LAST-MODIFIED:20241108T111548Z
UID:3085-1737389700-1737395100@run-regensburg.de
SUMMARY:Young Colloquium:Zwischen Forschung und Interessen: Wie die Wissenschaft die politische Bühne prägt
DESCRIPTION:Prof. Dr. Andreas LöschelRuhr-Universität Bochum \n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n \n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\nProf. Dr. Klaus RichterUniversität Regensburg
URL:https://run-regensburg.de/event/young-colloquiumzwischen-forschung-und-interessen-wie-die-wissenschaft-die-politische-buhne-pragt/
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20250123T161500
DTEND;TZID=Europe/Berlin:20250123T174500
DTSTAMP:20260421T141926
CREATED:20241108T111224Z
LAST-MODIFIED:20241108T111224Z
UID:3087-1737648900-1737654300@run-regensburg.de
SUMMARY:Young Colloquium:Predicting the future: How does climate modelling work? - Perspektive der Geophysik
DESCRIPTION:Prof. Dr. Tiffany A. ShawUniversity of Chicago
URL:https://run-regensburg.de/event/young-colloquiumpredicting-the-future-how-does-climate-modelling-work-perspektive-der-geophysik/
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