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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;TZID=Europe/Berlin:20250508T151500
DTEND;TZID=Europe/Berlin:20250508T160000
DTSTAMP:20260405T190441
CREATED:20250410T094457Z
LAST-MODIFIED:20260326T162647Z
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SUMMARY:RTG seminar:Prof. Dr. Götz Uhrig
DESCRIPTION:Concepts and applications in non-equilibrium physics \n\n\n\n \n\n\n\nTU Dortmund \n\n\n\n \n\n\n\nNon-equilibrium physics has become one of the thriving focal points in condensed matter physics. Pump-probe experiments are by now fairly common and further driving protocols attract more and more attention. We will discuss how periodic driving allows to cool a small quantum system by exploiting the commensurability of various oscillatory processes [1]. Interestingly\, the Lindblad damping of a highly excited state is crucial here. Turning to ordered magnetic systems\, it is common to describe their damping by Landau-Lifshitz-Gilbert equations. The question arises whether this phenomenological formalism is related to Lindblad damping. We will present such a conceptual link [2]. Finally\, we explicity consider how one can switch magnetic order efficiently by electromagnetic pulses. How strong do the pulses have to be [3]? What is the influence of relaxation? These question are relevant for processing data in magnetic storage devices. \n\n\n\n[1] Quantum coherence from commensurate driving with laser pulses and decay G.S. Uhrig; SciPost Phys. 8\, 040 (2020)[2] Landau-Lifshitz damping from Lindbladian dissipation in quantum magnets G.S. Uhrig; arXiv:2406.10613[3] Exchange enhanced switching by alternating fields in quantum antiferromagnets A. Khudoyberdiev\, G.S. Uhrig; Phys. Rev. B 111\, 064408 (2025) \n\n\n\nVenue: PHY 5.0.21
URL:https://grk2905.de/event/grk-seminarprof-dr-gotz-uhrig/
CATEGORIES:Seminar
ATTACH;FMTTYPE=image/jpeg:https://grk2905.de/wp-content/uploads/2025/04/uhrig_goetz_2024_10-scaled-e1744278379321.jpg
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DTSTART;TZID=Europe/Berlin:20250509T140000
DTEND;TZID=Europe/Berlin:20250509T150000
DTSTAMP:20260405T190441
CREATED:20250429T104324Z
LAST-MODIFIED:20250515T103307Z
UID:1638-1746799200-1746802800@grk2905.de
SUMMARY:Special lecture: Prof. Milena Grifoni
DESCRIPTION:Introduction to Floquet theory \n\n\n\nUniversity of RegensburgHow to characterize properties of a quan-tum system subject to an intense time-periodic drive? We shall address this question within the framework of Floquet theory. According to the Floquet theorem\, the solutions of the time-dependent Schrö-dinger equation display a quasi-stationary evolution\, governed by quasi-energies\, and a periodic part. Working in the Sambe space\, it is possible to evaluate both the so-called quasi-energy spectrum and the Floquet functions without resorting to perturbation theory in the strength of the time-periodic drive or other commonly used approxim-ations. Noticeably\, the quasi-energy spect-rum can be qualitatively different from the one of the undriven Hamiltonian\, opening pathways to manipulate properties of quantum systems by a time-periodic drive. These concepts will be illustrated on the example of a strongly driven two-level system. \n\n\n\n\n\n\n\n\n\n\n\n\n\nVenue: RUN auditorium \n\n\n\nLecture Notes: here.
URL:https://grk2905.de/event/special-lecture-prof-milena-grifoni/
CATEGORIES:Special lecture series
ATTACH;FMTTYPE=image/webp:https://grk2905.de/wp-content/uploads/2024/01/Grifoni-1.webp
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20250515T151500
DTEND;TZID=Europe/Berlin:20250515T154500
DTSTAMP:20260405T190441
CREATED:20250410T093613Z
LAST-MODIFIED:20260326T162621Z
UID:1615-1747322100-1747323900@grk2905.de
SUMMARY:RTG seminar: Artur Slobodeniuk
DESCRIPTION:Intraband motion corrections to the spectrum of excitons in transition metal dichalcogenide monolayers \n\n\n\n \n\n\n\nDepartment of Condensed Matter Physics\, Faculty of Mathematics and Physics\, Charles University\, Prague\, Czech Republic \n\n\n\n \n\n\n\n \n\n\n\nTransition metal dichalcogenide (TMD) monolayers are among the most intriguing two-dimensional materials for optoelectronic applications due to their unique valley-dependent electronic properties. In particular\, the superposition of intravalley exciton states at the nonequivalent ±K points can be considered a qubit\, which has potential applications in various quantum technologies. The manipulation of such qubits for dark intravalley excitons using intense magnetic fields was demonstrated in 2019 [1]. Subsequently\, similar control over bright excitonic states using non-resonant circularly polarized light was both experimentally observed and theoretically explained [2\,3]. In the latter\, the theoretical analysis relied on the Semiconductor Bloch equations (SBE)\, where the dominant interband transition terms were considered. However\, as it turned out\, this approximation is valid for small intensities of applied optical pulses and needs to be reconsidered for more intense pulses. In this work\, we analyze the solutions of the SBE\, incorporating the previously neglected intraband term\, which governs electron dynamics within the separate bands. We develop a new perturbation technique and calculate corrections to the shifts of intravalley exciton energies in TMD monolayers [4]. The possibility of experimentally measuring these results is also discussed. \n\n\n\nReferences \n\n\n\n [1] M. R. Molas et al\, Phys. Rev. Lett. 123\, 096803 (2019) \n\n\n\n [2] A. O. Slobodeniuk et al\, npj 2D Mater. Appl. 7\, 17 (2023) \n\n\n\n [3] A. O. Slobodeniuk et al\, Phys. Rev. B 106\, 235304 (2022) \n\n\n\n[4] A. O. Slobodeniuk\, T. Novotny\, https://arxiv.org/abs/2501.06885 \n\n\n\n \n\n\n\nVenue: PHY 5.0.20
URL:https://grk2905.de/event/grk-seminar-artur-slobodeniuk/
CATEGORIES:Seminar
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DTSTART;TZID=Europe/Berlin:20250521T090000
DTEND;TZID=Europe/Berlin:20250521T170000
DTSTAMP:20260405T190441
CREATED:20250225T133237Z
LAST-MODIFIED:20260326T162603Z
UID:1583-1747818000-1747846800@grk2905.de
SUMMARY:Joint RTG+IRTG onsite workshop: effective visual communication of science
DESCRIPTION:Venue: RUN 0.35 \n\n\n\nYou will learn the Seyens Method™—a comprehensive design philosophy\, process\, and set of strategies tailored specifically for scientists to visually communicate your own complex ideas so your messages are effortlessly understood by scientists or non-scientists.It is a structured\, no fluff\, memorable\, easy to follow\, useful and fun training that will empower and enable you to create effective images\, slides\, posters\, and grants. You will imediatelly apply the new skills to communicate your own science\, draw a graphical abstract and discuss it with your peers and receive actionable feedback on your images and slides. \n\n\n\nFind more information here and here.
URL:https://grk2905.de/event/joint-grkirtg-onsite-workshop-effective-visual-communication-of-science/
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