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DTSTART;TZID=Europe/Berlin:20231108T170000
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UID:1246-1699462800-1699466400@www.trr360.de
SUMMARY:TRR 360 Sonderseminar: The unusual electron transport in metallic Kagome nets Philip J. W. Moll
DESCRIPTION:The unusual electron transport in metallic Kagome nets \nProf. Dr. Philip J. W. Moll \nMax Planck Institute for the Structure and Dynamics of Matter \n  \nMaterials that can host different states of electronic order form a recurring theme in physics and \nmaterials science\, and they are of particular interest if they are coupled strongly. A famous \nexample are ferroelectrics\, in which electric polarization and magnetism not only coexist but are \nstrongly linked. This both unveils a rich physics of correlated states\, and also opens unexpected \napplication avenues as the coupling promises to manipulate one state by a stimulus that primarily \nacts on another – say switching magnetism using electric fields. \nRecently\, materials based on the structural motif of the Kagome web have attracted significant \nattention for their tendency to host such strongly coupled phases. In particular\, the centro- \nsymmetric layered Kagome metal (K\,Cs)V3Sb5 have entered the focus of experimental and \ntheoretical research. They host a charge-density-wave type transition at elevated temperatures \n~100K\, followed by a superconducting transition at 3K (exact values depend on composition). \nYet there is another type of electronic order which thus far eludes exact microscopic \nidentification. A series of experimental probes detects the onset of anomalous behavior around \nT’~30-40K\, including thermal Hall\, µSR\, NMR\, magnetic torque\, Kerr rotation. The anomalous \nlow-temperature state carries the characteristics of a chiral\, nematic and time-reversal-symmetry \nbreaking fluid (all of which are under most active debate currently). \nYet what crystallizes out of the current state of experimental data is a highly entangled system \nwhich is extraordinarily responsive to external perturbations. This materials main strength is \nequally its weakness\, the unusual degree of coupling between states can hinder its systematic \ninvestigation. However\, it is already clear that it provides a platform to explore strongly coupled \ncorrelated phases\, and as a result it displays a thus-far unknown electromagnetic response\, a \ndiode in which the forward direction can be switched by the application of a magnetic field. I \nwill review the current state of the field\, and discuss ongoing projects in my department. \n  \n[1] C. Guo et al.\, Nature 611\, 461-466 (2022) \n[2] X. Huang et al.\, PRB 106\, 064510 (2022) \n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr360-sonderseminar-magnetic-field-versus-temperature-phase-diagram-of-an-effective-spin-1-2-zigzag-chain-in-a-magnetic-semiconductor-ybcus2-takahiro-onimaru/
LOCATION:University of Augsburg\, Room S-288 + Zoom
CATEGORIES:Sonderseminar
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