BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Wen Wei Ho (Harvard) DTSTART:20200511T183000Z DTEND:20200511T193000Z DTSTAMP:20260423T040329Z UID:Kadanoff/2 DESCRIPTION:Title: Interacting phases of matter protected by multiple time-translation symme tries in quasiperiodically-driven systems\nby Wen Wei Ho (Harvard) as part of Kadanoff seminars\n\n\nAbstract\nThe discrete time-translation sym metry of a periodically-driven (Floquet) system allows for the existence o f novel\, nonequilibrium interacting phases of matter. A well-known exampl e is the discrete time crystal\, a phase characterized by the spontaneous breaking of this time-translation symmetry. In this talk\, I will show tha t the presence of *multiple* time-translation symmetries\, realized by qua siperiodically driving a system with two or more incommensurate frequencie s\, leads to a panoply of novel non-equilibrium phases of matter\, both sp ontaneous symmetry-breaking ("discrete time quasi-crystals") and topologic al. I will demonstrate that these phases are stable in a long-lived\, 'pre heating' regime\, by outlining rigorous mathematical results establishing slow heating at high driving frequencies. As a byproduct\, I will introduc e the notion of many-body localization (MBL) in quasiperiodically-driven s ystems.\n LOCATION:https://researchseminars.org/talk/Kadanoff/2/ END:VEVENT END:VCALENDAR