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X-ORIGINAL-URL:https://www.lps.u-psud.fr/
X-WR-CALNAME:Laboratoire de physique des Solides
X-WR-CALDESC:
REFRESH-INTERVAL;VALUE=DURATION:PT1H
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BEGIN:VEVENT
CLASS:PUBLIC
DTSTART;TZID=Europe/Paris:20221020T110000
DTEND;TZID=Europe/Paris:20221020T120000
DTSTAMP:20220925T081600
UID:MEC-4c2e5eaae9152079b9e95845750bb9ab@lps.u-psud.fr
CREATED:20220925
LAST-MODIFIED:20221013
PRIORITY:5
TRANSP:OPAQUE
SUMMARY:M.GARST: Magnetic skyrmion strings: How they bend, twist and vibrate
DESCRIPTION:\nMagnetic skyrmions are smooth topological textures of the magnetization that are localized within a two-dimensional plane. They arise in magnetic systems that lack inversion symmetry where they are stabilized by the Dzyaloshinskii-Moriya interaction. In bulk materials, magnetic skyrmions extend in the third direction forming an effective string. Such skyrmion strings either arise as excitations or they condense and form a crystal. These strings can be dynamically excited resulting in various vibrational modes.\n\nI will provide an overview of the dynamics of skrymion strings [1], that can be found in chiral magnets like MnSi or FeGe, and I’ll compare theoretical predictions with magnetic resonance spectroscopy [2], spin-wave spectroscopy [3], inelastic neutron scattering [4] and Brillouin light scattering [5]. At high energies, the spin-wave dynamics is governed by an emergent orbital magnetic field that is directly linked to the topological density of the skyrmions. As a result, magnon Landau levels emerge in skyrmion crystals. At low energies the dynamics is determined by an effective elasticity theory of the strings. I show that a single string supports non-linear solitary waves [6] similar to vortex filaments in fluids. \n\n[1] M. Garst, J. Waizner, D. Grundler, J.Phys.D: Appl.Phys. 50, 293002(2017)\n[2] T. Schwarze et al., Nat. Mater. 14, 478 (2015)\n[3] S. Seki et al., Nat. Commun. 11, 256 (2020)\n[4] T. Weber et al. Science 375, 1025 (2022)\n[5] N.Ogawa et al. PNAS 118, e2022927118(2021); C.Ping, D.Grundler, R.Ciola et al., unpublished\n[6] V. P. Kravchuk et al., Phys. Rev. B 102, 220408(R) (2020).\n\n
URL:https://www.lps.u-psud.fr/events/garst-20102022/
ORGANIZER;CN=Andrej Meszaros:MAILTO:
CATEGORIES:Séminaire de la Théorie de la Matière Condensée
LOCATION:Moyen amphi (LPS) + ONLINE (Zoom)
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