BEGIN:VCALENDAR VERSION:2.0 PRODID:-//wp-events-plugin.com//6.4.7.2//EN TZID:Europe/Paris X-WR-TIMEZONE:Europe/Paris BEGIN:VEVENT UID:0-1069@lptms.universite-paris-saclay.fr DTSTART;TZID=Europe/Paris:20251202T110000 DTEND;TZID=Europe/Paris:20251202T120000 DTSTAMP:20251125T171518Z URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lptm s-andrey-zelenskiy-lptms/ SUMMARY:Séminaire du LPTMS :Andrey Zelenskiy (LPTMS) - Salle des séminair es du FAST et du LPTMS\, bâtiment Pascal n°530 - 2 Déc 25 11:00 DESCRIPTION:From kagome antiferromagnets to self-assembly: anisotropic hier archy in dense and dilute systems\nAndrey Zelenskiy (LPTMS)\n \;\nGeom etric frustration arises when interactions favour local configurations tha t are incompatible with the global geometry of the system. To alleviate fr ustration\, many systems adopt locally suboptimal arrangements\, often lea ding to the emergence of complex structures and patterns.\nIn this talk\, I will explore geometric incompatibility in two contrasting systems: magne tic kagome crystals and solutions of patchy particles. In both cases\, inc reasing the anisotropy of interactions generates a hierarchy of competiti ons\, which manifests in the structure of the equilibrium phase.\nIn kago me magnets with AB-stacked layers\, while anisotropic interactions lower t he symmetry of the order parameter\, they at the same time induce self-dua lity mappings between distinct regions of parameter space. These mappings reveal extended regimes of high frustration\, where even moderate anisotro py drives a cascade of exotic phases\, including states that simultaneousl y exhibit both chiral and nematic order.\nBy contrast\, in solutions of an isotropic particles with short-range interactions\, frustration is often r elieved through changes in the overall density profile\, which defines the shape of the aggregate. Drawing analogies with frustrated magnets\, we id entify the anisotropic hierarchy for generic patchy particles\, and use it as a design principle for encoding structural features and motifs of self -assembled clusters. CATEGORIES:seminars LOCATION:Salle des séminaires du FAST et du LPTMS\, bâtiment Pascal n°53 0\, rue André Riviere\, Orsay\, 91405\, France X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=rue André Riviere\, Orsay\ , 91405\, France;X-APPLE-RADIUS=100;X-TITLE=Salle des séminaires du FAST et du LPTMS\, bâtiment Pascal n°530:geo:0,0 END:VEVENT BEGIN:VTIMEZONE TZID:Europe/Paris X-LIC-LOCATION:Europe/Paris BEGIN:STANDARD DTSTART:20251026T020000 TZOFFSETFROM:+0200 TZOFFSETTO:+0100 TZNAME:CET END:STANDARD END:VTIMEZONE END:VCALENDAR