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DTSTART;TZID=Europe/Berlin:20251104T160000
DTEND;TZID=Europe/Berlin:20251104T170000
DTSTAMP:20260424T131924
CREATED:20251007T095009Z
LAST-MODIFIED:20251029T225015Z
UID:5900-1762272000-1762275600@www.trr360.de
SUMMARY:TRR 360 Seminar: Imaging Magnetic Dynamics with In-situ and Ultrafast Lorentz Microscopy Sascha Schäfer
DESCRIPTION:Imaging Magnetic Dynamics with In-situ and Ultrafast Lorentz Microscopy \nProf. Dr. Sascha Schäfer \nDepartment of Physics\, University of Regensburg\, Regensburg\, GermanyRegensburg Center for Ultrafast Nanoscopy (RUN)\, Regensburg\, Germany \nThe interaction of magnetic materials with ultrashort light pulses provides intriguing glimpses into the inner workings of the magnetic couplings within a material but also offers an important experimental handle to locally manipulate magnetic textures and phases. Whereas many studies in the field of ultrafast magnetism have utilized various optical pump-probe methodologies\, these approaches often lack the required spatial resolution for mapping the nanoscale details of magnetic textures. Here\, I will present two methodologies to address ultrafast nanoscale magnetic dynamics in Lorentz microscopy. \nIn the first part of the talk\, I will discuss how in-situ Lorentz microscopy with femtosecond optical excitation [1] can unravel nonlinearities in the magnetic response upon light excitation\, focusing on the example of light-induced switching processes in the magnetic texture of Fe3Sn2 thin films [2]. This material hosts dipolar skyrmions [3] which are composed of chiral Bloch-like domain walls in the interior of the film and chiral Néel-like caps at each film surface. Femtosecond light pulses allow for the stochastic switching of the Néel cap chirality. The analysis of switching probabilities yields insights into the importance of interactions within and in-between skyrmions.    \nIn the second part of the talk\, I will discuss the current state of ultrafast transmission electron microscopy [4]\, specifically ultrafast Lorentz microscopy [6]\, in which femtosecond or picosecond electron pulses enable the stroboscopic imaging of optically or current-driven magnetic dynamics. I will highlight the impact of novel femtosecond electron sources\, including radiofrequency beam choppers [7] and laser-driven cold-field emitter sources [8]\, for different magnetic imaging techniques in electron microscopy\, as well as emerging possibilities due to fast electron detectors [9]. \n[1] T. Eggebrecht; M. Möller et al.\, Phys. Rev. Lett. 118\, 097203 (2017). [2] A Kovács\, J. T. Weber et al.\, Comm. Mat. 6\, 223\, (2025).[3] L. Kong et al.\, Phys. Rev. B 107\, 174425 (2023).[4] Feist et al.\, Ultramicroscopy 176\, 63 (2017).[5] Feist et al.\, Nature 521\, 200 (2015). [6] N. Rubiano da Silva et al.\, Phys. Rev. X 8\, 031052 (2018).[7] C. Liu et al.\, Nat. Mat. 24\, 406 (2025).[8] A. Schröder et al.\, Ultramicroscopy 275\, 114158 (2025).[9] A. Schröder et al.\, Ultramicroscopy 256\, 113881 (2024). \n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr-360-seminar-tba-sascha-schafer/
LOCATION:University of Augsburg\, Room S-288 + Zoom
CATEGORIES:Seminar
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20251112T140000
DTEND;TZID=Europe/Berlin:20251112T150000
DTSTAMP:20260424T131924
CREATED:20251013T100639Z
LAST-MODIFIED:20251110T104233Z
UID:5981-1762956000-1762959600@www.trr360.de
SUMMARY:TRR 360 Seminar:!! Canceled due to illness of the speaker !! Sebastian Diehl
DESCRIPTION:Tba \nProf. Dr. Sebastian Diehl \nUniversity of Cologne \n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr-360-seminartba-sebastian-diehl/
LOCATION:Technical University Munich + Zoom
CATEGORIES:Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20251118T160000
DTEND;TZID=Europe/Berlin:20251118T170000
DTSTAMP:20260424T131924
CREATED:20251114T110811Z
LAST-MODIFIED:20251114T112843Z
UID:6157-1763481600-1763485200@www.trr360.de
SUMMARY:TRR 360 Sonderseminar: Computational design of quantum materials using density functional theory and beyond Manish Verma
DESCRIPTION:Computational design of quantum materials using density functional theory and beyond \n\n\n\n \n\n\n\nDr. Manish Verma \n\n\n\n \n\n\n\n\n\n\n\nInstitute for Theoretical Physics and AstrophysicsComputational Quantum MaterialsJulius-Maximilians-Universität Würzburg \n\n\n\n\n\n\n\n \n\n\n\nComputational design of quantum materials using density functional theory (DFT) and many-body techniques-both perturbative and non-perturbative\, has become a powerful tool for exploring key physical phenomena such as strong correlations\, metal-to-insulator transitions (MIT)\, magnetism\, and thermoelectricity etc. In this direction\, designing novel electronic properties in artificial transition metal oxide (TMO) heterostructures\, distinct from their bulk counterparts\, has emerged as a new paradigm enabled by modern layer-by-layer growth techniques and the unique nature of d-electrons. I will start my talk by discussing the mechanisms driving the MIT and magnetism in ultrashort-period superlattices (SL)\, namely (SrVO3)1/(SrTiO3)1(001) [1\, 2] and (LaNiO3)1/(LaAlO3)1(001) [3]\, where confinement and epitaxial strain play fundamental roles. Subsequently\, I will present the MIT in Ca-doped LaMnO3\, which arises from the interplay between strain and chemical doping [4]. TMO-based SL are also known to exhibit high thermoelectric response\, in addition to their environmental friendliness and stability. In this context\, I will discuss the doping-induced robust p-type thermoelectric response in ultrashort-period (SrMnO3)1/(SrTiO3)1(001) SL\, obtained by employing Boltzmann transport theory within constant-relaxation time approach. Next\, I will then present my results on strategies for reducing lattice thermal conductivity in artificial oxide superlattices\, obtained using many-body perturbation theory calculations of phonon-phonon interactions. Transition-metal oxides are further known to display strong correlation effects due to their d-electrons. In this regard\, LiV2O4 stands out as an enigmatic heavy fermion compound lacking localized f-orbital states. I will present DFT combined with dynamical mean-field theory (DFT+DMFT) results that elucidate the origin of heavy-fermion behavior\, supported by angle-resolved photoemission spectroscopy (ARPES) measurements [5]. \n\n\n\n\n\n\n\n[1] M. Verma\, B. Geisler\, and R. Pentcheva\, Phys. Rev. B 100\, 165126 (2019).[2] M. Verma and R. Pentcheva\, Phys. Rev. Research 4\, 033013 (2022).[3] M. Verma and R. Pentcheva\, Phys. Rev. Research 6 (1)\, 013189 (2024).[4] S. S. Hong et al.\, Science 368\, 71 (2020).[5] D. Oh et al.\, Proceedings of the National Academy of Sciences 122 (45)\, e2518213122 (2025). \n\n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr-360-sonderseminar-computational-design-of-quantum-materials-using-density-functional-theory-and-beyond-manish-verma/
LOCATION:University of Augsburg\, Room S-288
CATEGORIES:Sonderseminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20251119T140000
DTEND;TZID=Europe/Berlin:20251119T150000
DTSTAMP:20260424T131924
CREATED:20251013T101037Z
LAST-MODIFIED:20251119T112925Z
UID:5985-1763560800-1763564400@www.trr360.de
SUMMARY:TRR 360 Seminar:A New Perspective on Correlated Metals: from Concealed Mott Quantum Criticality to Disorder in Heavy Fermi Liquids Louk Rademaker
DESCRIPTION:A New Perspective on Correlated Metals: from Concealed Mott Quantum Criticality to Disorder in Heavy Fermi Liquids\n \nProf. Dr. Louk Rademaker \nUniversité de Genève\, Switzerland \n\n\n\n\n\n\nThe band-structure picture of metals is very successful in many materials where the electron correlations are weak. On the other extreme\, when correlations are very strong\, one expects interaction-induced insulators – due to Mott localization or symmetry breaking. However\, the intermediate regime where correlations are strong but the material remains gapless\, harbors many open questions in our understanding of quantum materials. \n\n\n\nIn this talk\, I will give an overview of three aspects of correlated metals. I will discuss the relation between quantum criticality at the Kondo breakdown and in doped charge-transfer insulators like the cuprates. These metal-to-metal transitions can be viewed as exhibiting concealed Mott criticality. \n\n\n\nNear a Mott critical point\, large effective mass enhancements are observed. The famous Landau relation between mass enhancement and specific heat requires a new sum rule for the temperature-dependence of the electron self-energy. \n\n\n\nIn such heavy Fermi liquids\, the interplay between correlations and disorder cannot be ignored. Inspired by new experiments on organic compounds\, we show that contrary to textbooks\, the residual resistivity is affected by the mass enhancement. \n\n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr-360-seminartba-louk-rademaker/
LOCATION:Technical University Munich + Zoom
CATEGORIES:Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20251126T140000
DTEND;TZID=Europe/Berlin:20251126T150000
DTSTAMP:20260424T131924
CREATED:20251013T101348Z
LAST-MODIFIED:20251125T131546Z
UID:5988-1764165600-1764169200@www.trr360.de
SUMMARY:TRR 360 Seminar:Experimental prospects on measurement-altered criticality Sara Murciano
DESCRIPTION:Experimental prospects on measurement-altered criticality \nProf. Dr. Sara Murciano \nUniversité Paris Saclay\, France \n\n\n\n\n\n\nQuantum critical systems constitute appealing platforms for the exploration of novel measurement-induced phenomena due to their innate sensitivity to perturbations. I will devise a practical scheme for realizing measurement-altered criticality in a chain of Rydberg atoms tuned to Ising and tricritical Ising phase transitions. Projectively measuring a periodic subset of atoms alters quantum critical correlations in distinct ways that one can control via the choice of measured sites and the measurement outcomes. While this protocol relies on post-selection\, the measurement outcomes yielding the most dramatic consequences occur with surprisingly large probabilities. \n\n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr-360-seminartba-sara-murciano/
LOCATION:Technical University Munich + Zoom
CATEGORIES:Seminar
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