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DTSTART;TZID=Europe/Berlin:20250508T151500
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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
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DTSTART;TZID=Europe/Berlin:20250515T151500
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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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