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:0-1107@lptms.universite-paris-saclay.fr DTSTART;TZID=Europe/Paris:20260505T110000 DTEND;TZID=Europe/Paris:20260505T120000 DTSTAMP:20260420T143655Z URL:http://www.lptms.universite-paris-saclay.fr/seminars/lptms-seminar-pie tro-caracciolo-di-torella-florent-ferro-lptms-orsay/ SUMMARY:LPTMS Seminar: Pietro Caracciolo Di Torella &\; Florent Ferro (L PTMS\, Orsay) - Salle des séminaires du FAST et du LPTMS\, bâtiment Pasc al n°530 - 5 Mai 26 11:00 DESCRIPTION:Anisotropic decomposition: a compass and a map to design patchy particles interactions\nPietro Caracciolo Di Torella (LPTMS\, Orsay)\n&nb sp\;\n\nSelf-assembly is the process by which individual building blocks s pontaneously organize into larger aggregates. A widely used approach to mo del this process relies on patchy particles\, where anisotropic interactio ns are encoded through patches on the particle surface and the structures that emerge are determined by which pairs of patches attract or repel one another. A natural parametrization of particle interactions assigns an ind ependent interaction energy to each distinct patch–patch contact. Howeve r\, translating many local patch–patch rules into global structural outc omes is far from intuitive\, and becomes increasingly challenging as the n umber of patch types grows. Here we introduce a class of two- and three-di mensional lattice models of patchy particles for which\, using tools from group theory\, the full interaction matrix can be analytically decomposed into a set of anisotropic modes\, each possessing well-defined symmetry pr operties. We then show that each anisotropic mode has a distinct and inter pretable effect on the macroscopic properties of the assembled structure. By rewriting the interactions in this way\, we can both understand why a g iven set of interactions produces a particular aggregate and design intera ctions that target desired structural outcomes.\n\n \;\n\n \;\nBre aking of clustering and macroscopic quantum coherence out of equilibrium\n Florent Ferro (LPTMS\, Orsay)\n \;\n\nWe investigate the dynamics of s ymmetry-breaking states under both non-interacting [1] and interacting [2] Hamiltonians following a local quench. We show that such states exhibit a breakdown of clustering properties at ballistic scales\, resulting in ano malously large fluctuations of extensive order parameters. Using the Quant um Fisher Information (QFI)\, we show that this setting is an ideal framew ork for the emergence of macroscopic quantum coherence. Specifically\, we show that the breaking of clustering allows the system to develop coherenc e at scales proportional to the time after the quench. Our findings presen ts this scenario as one of the most natural ways to develop cat-like state s from product states through simple local interactions.\n[1]: F Ferro and M Fagotti\, arxiv.org/abs/2503.21905\n[2]: F Ferro\, arxiv.org/abs/2602.1 5969 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:DAYLIGHT DTSTART:20260329T030000 TZOFFSETFROM:+0100 TZOFFSETTO:+0200 TZNAME:CEST END:DAYLIGHT END:VTIMEZONE END:VCALENDAR