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X-WR-CALNAME:GRK 2905 - Ultrafast Nanoscopy
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X-WR-CALDESC:Events for GRK 2905 - Ultrafast Nanoscopy
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DTSTART:20250330T010000
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DTSTART;TZID=Europe/Berlin:20250326T133000
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DTSTAMP:20260428T113932
CREATED:20250325T103300Z
LAST-MODIFIED:20260326T162736Z
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SUMMARY:RTG seminar: Dr. David N Purschke
DESCRIPTION:Strong‐fields and photons in solids\, from classical to quantum light \n\n\n\n \n\n\n\nJoint Attosecond Science Laboratory\, University of Ottawa and NationalResearch Council of Canada \n\n\n\n \n\n\n\n \n\n\n\nAt the surface\, strong‐field physics and quantum optics seem to operate in disparate regimes of light‐matter interaction. Nevertheless\, the growing field of attosecond quantum opticsis beginning to bridge this gap\, with the solid state providing an ideal platform of study [1]. I will discuss two experiments at this intersection: in the first\, we see how a photon picture emerges from a laser‐dressed crystal using classical light [2]. In the second\, we begin to study field‐driven processes with emerging non‐classical and intense sources known as brightsqueezed vacuum [3]. \n\n\n\n[1] L. Cruze‐Rodriguez et al. “Quantum phenomena in attosecond science\,” Nat. Rev. Phys. 19 (2023) [2] D. N Purschke et al. “Microscopic mechanisms of highorderwavemixing in solids\,” Phys. Rev. A 108 (2023)[3] S. Lemieux et al. “Photon bunching in high‐harmonic emission controlled by quantum light” arXiv:2404.05474 \n\n\n\nVenue: RUN 0.35
URL:https://grk2905.de/event/grk-seminar-dr-david-n-purschke/
CATEGORIES:Seminar
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DTSTART;TZID=Europe/Berlin:20250327T100000
DTEND;TZID=Europe/Berlin:20250327T110000
DTSTAMP:20260428T113932
CREATED:20250325T091915Z
LAST-MODIFIED:20260326T162706Z
UID:1594-1743069600-1743073200@grk2905.de
SUMMARY:RTG seminar:Dr. Jan Gerrit Horstmann
DESCRIPTION:Optical control of nonequilibrium phases: from hammers to tweezers: \n\n\n\nDepartment of Materials\,ETH Zurich \n\n\n\n \n\n\n\nUltrafast pump-probe spectroscopy has not only provided remarkable insights into electronic and structural dynamics on atomic length and femtosecond time scales but has also enabled the optical control of nonequilibrium states. Over the past decade\, a dominant trend in the field has been the shift from strong\, unselective optical stimuli towards the selective excitation of few key degrees of freedom—in other words\, from hammers to tweezers. This ap-proach promises more energy-efficient switching and access to entirely new states of matter.In this talk\, I will present three examples of optical control over nonequilibrium states with increasing selectivity. The spectrum ranges from laser-induced thermal quenching of a multiferroic domain pattern to the all-optical amplification of a key phonon mode in a van der Waals ferroelectric\, and finally to the ultrafast manipulation of metal-insulator nanotex-tures. Furthermore\, I will provide an outlook on a novel approach for the investigation and control of structural dynamics based on non-resonant excit-ation of phonons via transient Raman forces. \n\n\n\nVenue: RUN auditorium
URL:https://grk2905.de/event/grk-seminar-optical-control-of-nonequilibrium-phases-from-hammers-to-tweezers/
CATEGORIES:Seminar
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