BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//FeRMI - ECPv6.15.20//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:FeRMI
X-ORIGINAL-URL:https://fermi.univ-tlse3.fr
X-WR-CALDESC:Évènements pour FeRMI
REFRESH-INTERVAL;VALUE=DURATION:PT1H
X-Robots-Tag:noindex
X-PUBLISHED-TTL:PT1H
BEGIN:VTIMEZONE
TZID:Europe/Paris
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20220327T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20221030T010000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20230326T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20231029T010000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20240331T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20241027T010000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20230124T140000
DTEND;TZID=Europe/Paris:20230124T153000
DTSTAMP:20260423T164940
CREATED:20230123T070038Z
LAST-MODIFIED:20230123T093722Z
UID:8680-1674568800-1674574200@fermi.univ-tlse3.fr
SUMMARY:Suppression of Heating due to Emergence of Local Conservation Laws in Clean Interacting Floquet Quantum Matter (Asmi Haldar / Seminar / LPT). - 24/01/2023
DESCRIPTION:Asmi Haldar (MPIPKS\, Dresden) \nSeminar LPT\, Tuesday January 24\, 2023 – 14:00 – Seminar room\, 3R1 – 3rd floor \n  \nAbstract: We consider a clean quantum system subject to strong periodic driving. The existence of a dominant energy scale\, hxD\, can generate considerable structure in an effective description of a system that\, in the absence of the drive\, is nonintegrable and interacting\, and does not host localization. In particular\, we uncover a threshold of drive strength beyond which the system transits sharply from a quantum chaotic to a dynamically frozen regime. We identify special points of freezing in the space of drive parameters (frequency and amplitude). At those points\, the dynamics is severely constrained due to the emergence of an almost exact\, local conserved quantity\, which scars the entire Floquet spectrum by preventing the system from heating up ergodically\, starting from any generic state\, even though it delocalizes over an appropriate subspace. At large drive frequencies\, where a naïve Magnus expansion would predict a vanishing effective (average) drive\, we devise instead a strong-drive Magnus expansion in a moving frame. There\, the emergent conservation law is reflected in the appearance of the « integrability » of an effective Hamiltonian. These results hold for a wide variety of Hamiltonians\, including the Ising model in a transverse field in any dimension and for any form of Ising interaction. The phenomenon is also shown to be robust in the presence of two-body Heisenberg interactions with any arbitrary choice of couplings. Furthermore\, we construct a real-time perturbation theory that captures resonance phenomena where the conservation breaks down\, giving way to unbounded heating. This approach opens a window on the low-frequency regime where the Magnus expansion fails. Finally\, using iTEBD we demonstrate the persistence of the threshold\, and the conservation law beyond it in infinite systems.
URL:https://fermi.univ-tlse3.fr/event/tba-asmi-haldar-seminar-lpt-24-01-2023/
LOCATION:salle de séminaire 3ème étage\, Bâtiment 3r1 Université Toulouse III\, Toulouse\, 31400\, France
CATEGORIES:Events,LPT,Seminars
END:VEVENT
END:VCALENDAR