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DTSTART;TZID=Europe/Berlin:20250515T140000
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DTSTAMP:20260424T222546
CREATED:20250507T154835Z
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SUMMARY:TRR 360 Sonderseminar: Probing ultrafast Electron and Spin Dynamics in Momentum\, Space\, and Time Martin Aeschlimann
DESCRIPTION:Probing ultrafast Electron and Spin Dynamics in Momentum\, Space\, and Time \n\n\n\nProf. Dr. Martin Aeschlimann \n\n\n\nDepartment of Physics and Research Center OPTIMAS\, RPTU Kaiserslautern-Landau \n\n\n\n \n\n\n\nCompeting interactions of spin with charge and lattice\, determined by the spin-orbit interaction\, give rise to rich phase diagrams of states in novel correlated electron materials. In such materials\, magnetically ordered phases are very often in direct competition with other ordered phases\, such as a spin- or charge-ordered phase. Unfortunately\, the dominant interaction responsible for the formation of a particular phase is often difficult to determine at thermal equilibrium\, so that a fundamental understanding of the underlying competing interactions is out of reach using static measurements. Time-resolved spectroscopy techniques have the potential to overcome these limitations by temporally driving the material system out of equilibrium. The subsequent relaxation pathways are then determined by the spin-charge lattice interactions\, which can be studied using different photoemission techniques. In this talk I will show how recent developments in ultrafast light sources and photoemission detector technology have paved the way for a completely new generation of time- and spin-resolved photoemission experiments. With this tool at hand we can directly observe the temporal evolution of excited carriers and spins in energy\, momentum space and time\, providing an unprecedented insight into the fundamental energy and (angular) momentum dissipation mechanisms even in complex condensed matter. \n\n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr-360-sonderseminar-probing-ultrafast-electron-and-spin-dynamics-in-momentum-space-and-time-martin-aeschlimann/
LOCATION:University of Augsburg\, Room S-288 + Zoom
CATEGORIES:Sonderseminar
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20250520T160000
DTEND;TZID=Europe/Berlin:20250520T170000
DTSTAMP:20260424T222546
CREATED:20250328T135335Z
LAST-MODIFIED:20250519T135602Z
UID:5006-1747756800-1747760400@www.trr360.de
SUMMARY:TRR 360 Seminar: !! Canceled due to illness of the speaker !!Designing Quantum Materials with Light Michael Sentef
DESCRIPTION:The seminar talk has been canceled due to illness of the speaker!\nDesigning Quantum Materials with Light \nProf. Dr. Michael Sentef \nUniversität Bremen \nMax Planck Institute for the Structure and Dynamics of Matter\, Hamburg\, Germany \nIn recent years\, light-driven quantum materials science has undergone a fundamental transformation. What was once a theoretical vision—the ability to control and manipulate emergent properties of materials on ultrafast timescales—has now become a reality [1]. This progress has been enabled by rapid advancements in shaping laser pulses\, probing nonequilibrium dynamics with femtosecond resolution\, and developing sophisticated theoretical approaches to describe light-driven many-body systems [2]. As a result\, we are now entering an era in which quantum materials can be actively “designed” and controlled using tailored light fields. \nA cornerstone of this approach is Floquet engineering\, which exploits periodic driving to coherently modify electronic states and induce novel phases of matter. I will briefly review key experimental and theoretical developments in realizing Floquet states in quantum materials and discuss their implications for controlling competing orders. However\, despite its promise\, Floquet engineering also faces intrinsic limitations\, particularly due to heating effects and decoherence\, which can constrain its applicability as a general tuning mechanism. \nMoving beyond conventional Floquet approaches\, a new frontier is emerging: cavity quantum materials [3]. By embedding materials in tailored quantum-electrodynamical environments\, such as optical cavities\, it is possible to enhance light-matter interactions and create hybrid light-matter states with fundamentally new properties. Unlike classical laser-driven schemes\, cavity-mediated interactions can modify quantum fluctuations and collective excitations even in thermal equilibrium\, offering a novel route to control material properties without direct external driving. I will highlight recent advances in this field\, both from theoretical [4] and experimental [5\,6] perspectives\, and specifically discuss how strong correlations in cavity quantum materials provide new opportunities for engineering competing electronic orders through light-matter hybridization. This emerging paradigm may open pathways toward controlling superconductivity\, charge density waves\, and other ordered phases in a fundamentally new way. \n \n \nFigure: Top left – illustration of a quantum material driven by a classical laser drive. Top right – cavity-embedded quantum material\, opening the possibility to use vacuum fluctuations of light to control emergent properties. Bottom – setup of the McIver lab for on-chip THz spectroscopy of quantum materials in a plasmonic cavity [5]. \n[1] A. de la Torre et al.\, Rev. Mod. Phys. 93\, 041002 (2021) \n[2] F. Caruso et al.\, arXiv:2501.06752 \n[3] F. Schlawin et al.\, Applied Physics Reviews 9\, 011312 (2022) \n[4] M. A. Sentef et al.\, Phys. Rev. Research 2\, 033033 (2020) \n[5] G. Kipp\, H. Bretscher\, et al.\, arXiv:2403.19745 \n[6] B. Le Dé et al.\, Journal of Physics: Materials 5\, 024006 (2022); I. Keren\, T. Webb\, D. Basov\, et al.\, forthcoming \n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr-360-seminar-tba-michael-sentef/
LOCATION:University of Augsburg\, Room S-288 + Zoom
CATEGORIES:Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20250527T160000
DTEND;TZID=Europe/Berlin:20250527T170000
DTSTAMP:20260424T222546
CREATED:20250328T135619Z
LAST-MODIFIED:20250523T105525Z
UID:5009-1748361600-1748365200@www.trr360.de
SUMMARY:TRR 360 Seminar: RIXS interferometry: cluster Mott insulators and bond-directional excitations in Kitaev materials Markus Grüninger
DESCRIPTION:RIXS interferometry: cluster Mott insulators and bond-directional excitations in Kitaev materials \nProf. Dr. Markus Grüninger \nUniversität zu Köln \n  \nCluster Mott insulators provide a platform for novel types of quantum magnets with unconventional magnetic moments. Electrons are localized on a cluster such as a dimer and occupy quasimolecular cluster orbitals. In cluster Mott insulators\, RIXS interferometry reveals the symmetry and character of excited states\, offering a powerful tool to study the electronic structure. We systematically investigate the quasimolecular properties of dimers\, trimers\, and tetrahedra in the 5d transition-metal compounds Ba3MIr2O9\, Ba4NbIr3O12\, and GaTa4Se8. Furthermore\, we discuss the applicability of the cluster picture for 3d GaV4S8. \nRIXS interferometry can also be applied to Kitaev materials such as Na2IrO3 and α-Li2IrO3 and shows distinctive fingerprints of Kitaev physics. Kitaev exchange restricts spin-spin correlations to nearest neighbors\, giving rise to a dimer-like dynamical structure factor. Bond-directional exchange implies the existence of bond-directional excitations. Making use of polarization selection rules\, RIXS reveals this bond-directional character of magnetic excitations in Na2IrO3. \n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr-360-seminar-tba-markus-gruninger/
LOCATION:University of Augsburg\, Room S-288 + Zoom
CATEGORIES:Seminar
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