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DTSTART;TZID=Europe/Berlin:20261021T140000
DTEND;TZID=Europe/Berlin:20261021T150000
DTSTAMP:20261021T091917Z
CREATED:20260517T181806Z
LAST-MODIFIED:20261021T091917Z
UID:6748-1792591200-1792594800@www.trr360.de
SUMMARY:TRR 360 Seminar:How quantum is quantum geometry? Ady Stern
DESCRIPTION:How quantum is quantum geometry? \nProf. Dr. Ady Stern \nCondensed Matter Physics\, Weizmann Institute\, Rehovot\, Israel \n  \nThe quantum geometric tensor – the Berry curvature together with the quantum metric – now underlies a long list of observables\, from the anomalous Hall effect to the superfluid weight of a flat band. We ask which of these observables actually require quantum mechanics. We find that most of them do not. \n\n\n\n\n\n\n \n\n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr-360-seminartba-ady-stern/
LOCATION:Technical University Munich + Zoom
CATEGORIES:Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20261103T160000
DTEND;TZID=Europe/Berlin:20261103T170000
DTSTAMP:20261013T092428Z
CREATED:20260707T120103Z
LAST-MODIFIED:20261013T092428Z
UID:6853-1793721600-1793725200@www.trr360.de
SUMMARY:TRR 360 Seminar:A fresh look on frustration: spin-Peierls Transition in spinels and Curie-law crossoverLudovic Jaubert
DESCRIPTION:A fresh look on frustration: spin-Peierls Transition in spinels and Curie-law crossover\n \nProf. Dr. Ludovic Jaubert \nLaboratoire Ondes et Matière d’AquitaineUniversity of Bordeaux\, France \n  \nIn this seminar\, we will provide a fresh look on two canonical questions in frustrated magnetism: transitions in spinels and the Curie-Weiss law. \nThe chromium spinels (e.g. MgCr2O4\, ZnCr2O4 …) are prime examples of the highly frustrated pyrochlore lattice antiferromagnet. Experiment has carefully established that these materials\, upon cooling\, distort to lower symmetry and order magnetically. Here we will study the nature of the transition by a combination of density-functional-theory based energy mapping and classical Monte Carlo simulations [1\,2]. Based on ab-initio Hamiltonian parameters\, we will simulate both materials and estimate the respective ordering temperatures of the high- and low-symmetry structures. Comparing our results with experiments\, we find that simulations are consistent with a type of spin-Peierls mechanism\, adapted to three dimensions\, where the structural distortion is mediated by a magnetic energy gain thanks to a lower degree of frustration. \nIn a second part\, we will revisit the textbook Curie-Weiss law\, in the context of frustration. The Curie-Weiss law is widely used to estimate the strength of frustration in frustrated magnets. However\, this law was originally derived as an estimate of magnetic correlations close to a mean-field phase transition\, which—by definition—is absent in spin liquids. Instead\, the susceptibility of spin liquids undergoes a Curie-law crossover between two magnetically disordered regimes. Here\, we study the generic aspect of the Curie-law crossover by comparing a variety of frustrated spin models in two and three dimensions [3]\, using both classical Monte Carlo simulations and analytical Husimi tree calculations. Husimi tree calculations fit remarkably well the simulations for all temperatures and almost all lattices. Based on this result\, we propose a Husimi ansatz for the magnetic susceptibility 𝜒⁢\, in order to estimate the Curie-Weiss temperature 𝜃cw. We apply the Ansatz to experimental measurements of various frustrated materials\, showing that it fits the data as well\, if not better\, than the traditional Curie-Weiss law. \n[1] Jeschke\, Iqbal & Jaubert\, Physical Review Letters 134\, 086702 (2025)[2] Jeschke\, Iqbal & Jaubert\, in preparation[3] Pohle & Jaubert\, Physical Review B 108\, 024411 (2023) \n\n\n\n\n\n\n \n\n\n\n \n\n\n\n \n\n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr-360-seminartbaludovic-jaubert/
LOCATION:University of Augsburg\, Room S-288 + Zoom
CATEGORIES:Seminar
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20261117T160000
DTEND;TZID=Europe/Berlin:20261117T170000
DTSTAMP:20261013T092150Z
CREATED:20260804T102423Z
LAST-MODIFIED:20261013T092150Z
UID:6920-1794931200-1794934800@www.trr360.de
SUMMARY:TRR 360 Seminar:tba Marios Michael
DESCRIPTION:tba \nDr. Marios Michael \nMax Planck Institute for the Structure and Dynamics of Matter\, Hamburg \nMax Planck Institute for the Physics of Complex Systems\, Dresden \n\n\n\n\n\n\n \n\n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr-360-seminartba-marios-michael/
LOCATION:University of Augsburg\, Room S-288 + Zoom
CATEGORIES:Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20270202T160000
DTEND;TZID=Europe/Berlin:20270202T170000
DTSTAMP:20261013T093625Z
CREATED:20261013T093623Z
LAST-MODIFIED:20261013T093625Z
UID:7162-1801584000-1801587600@www.trr360.de
SUMMARY:TRR 360 Seminar:tba Balazs Hetenyi
DESCRIPTION:tba \nDr. Balazs Hetenyi \nWigner Research Centre for Physics\, Budapest\, Hungary \n  \n\n\n\n\n\n\n \n\n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr-360-seminartba-balazs-hetenyi/
LOCATION:University of Augsburg\, Room S-288 + Zoom
CATEGORIES:Seminar
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