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X-WR-CALDESC:Events for GRK 2905 - Ultrafast Nanoscopy
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DTSTART;TZID=Europe/Berlin:20260619T140000
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SUMMARY:RTG Colloquium: Alice Kunin
DESCRIPTION:High-performance time-resolved photoemission experiments of quantum materials\n\n\n\nPrinceton University \n\n\n\n \n\n\n\nI will discuss our work coupling MHz\, kW light sources with momentum microscopy to enable efficient time- and angle-resolved photoemission (tr-ARPES) studies. I will first examine the dynamics of intra- and interlayer excitons in twisted van der Waals heterobilayers. I will then discuss our current work on a new spectrometer to probe ultrafast surface photochemistry in situ with the extension of tr-ARPES beyond ultrahigh vacuum towards more realistic chemical environments. \n\n\n\n \n\n\n\n \n\n\n\n \n\n\n\nVenue: RUN Auditorium
URL:https://grk2905.de/event/grk-colloquium-alice-kunin/
CATEGORIES:Colloquium
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DTSTART;TZID=Europe/Berlin:20260703T140000
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DTSTAMP:20260622T154308Z
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UID:2025-1783087200-1783090800@grk2905.de
SUMMARY:RTG Colloquium: Bruno Schuler
DESCRIPTION:Probing atomic defects in 2D semiconductors with light-coupled STM\n\n\n\nEmpa\, Switzerland \n\n\n\n \n\n\n\nTwo-dimensional (2D) semiconductors provide an exciting platform to engineer atomic quantum systems in a robust\, yet tunable solid-state system. This talk explores the intriguing physics of single point defects in transition metal dichalcogenide (TMD) monolayers\, investigated through atomically resolved scanning probe microscopy. \n\n\n\nWe demonstrate electrically induced exciton emission from both pristine MoS₂ and individual charged defects using scanning tunnelling microscope luminescence (STML) on ultrathin hBN decoupling layers [1]. Furthermore\, I will present our recent advances in time-resolved THz-STM using QEV maps to achieve state-selective ultrafast charge injection [2]. This approach enables the investigation of charge [3] and exciton dynamics [4] with atomic spatial\, millielectronvolt energy\, and picosecond temporal resolution. \n\n\n\nBy combining the structural and electronic properties accessible by conventional scanning probe microscopy with the optical fingerprint from STML and the excited-state dynamics revealed through pump-probe THz-STM\, we gain a comprehensive microscopic understanding of localized quantum states in low-dimensional materials. \n\n\n\n \n\n\n\n[1] L. Huberich et al. arxiv: 2510.15676 (2025)[2] L. Bobzien et al. APL Mater. 12\, 051110 (2024)[3] J. Allerbeck et al. Nat. Commun. 16\, 10806 (2025)[4] L. Bobzien et al. (in preparation) \n\n\n\n \n\n\n\n \n\n\n\nVenue: RUN Auditorium
URL:https://grk2905.de/event/grk-colloquium-bruno-schuler/
CATEGORIES:Colloquium
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