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X-ORIGINAL-URL:https://www.lps.u-psud.fr/
X-WR-CALNAME:Laboratoire de physique des Solides
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BEGIN:VEVENT
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DTSTART;TZID=Europe/Paris:20240425T110000
DTEND;TZID=Europe/Paris:20240425T120000
DTSTAMP:20240420T145500
UID:MEC-922073b18844540f8fe447c3e93a25b7@lps.u-psud.fr
CREATED:20240420
LAST-MODIFIED:20240420
PRIORITY:5
TRANSP:OPAQUE
SUMMARY:D.CARPENTIER:What can topology teach us about the mechanics of metamaterials, and vice-versa?
DESCRIPTION:\nIn recent years, the use of topology has deepened our understanding of collective phases of various waves, from electrons to magnons. I will focus on the mechanics of metamaterials. Can topology be of any use in this context? In return, can we learn general properties of topological phases from their mechanical counterpart? \n\nI will show that, while the use of topology to characterize mechanical metamaterials can be traced back to a seminal work of Maxwell, its recent reformulation allows for a direct experimental measurement of the topological nature of a mechanical configuration [1]. This measurement is unique: it does not require any a priori theoretical description of a metamaterial, yet it allows to predict the location of low energy deformations and self-stresses. \n\nI will then turn to a topological property a priori specific to mechanics, characterizing the deformation of a non-orientable Möbius strip [2]. I will show that the buckling modes of such a strip are constrained to vanish along the ribbon. This property challenges the very concept of bulk-boundary-correspondence of topological phases, by embedding an edge state in the bulk of a topological phase. I will then show that the non-orientable mechanics of this Möbius strip is not restricted to non-orientable metamaterials, but extends to various frustrated phases of matter beyond the realm of mechanics [3].  \n\n[1] M. Guzman et al., PNAS 121, e2305287121 (2024)\n[2] D. Bartolo and D. Carpentier, Phys. Rev. X 9, 041058 (2019)\n[3] X. Guo et al., Nature 618, p.506–512 (2023)\n\n
URL:https://www.lps.u-psud.fr/events/carp-2024/
ORGANIZER;CN=Andrej Mesaros:MAILTO:andrej.mesaros@universite-paris-saclay.fr
CATEGORIES:Séminaire de la Théorie de la Matière Condensée
LOCATION:Moyen amphi (LPS) + ONLINE (Zoom)
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