BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Anatoli Polkovnikov (Boston University) DTSTART:20210315T170000Z DTEND:20210315T180000Z DTSTAMP:20260423T005845Z UID:QM3/35 DESCRIPTION:Title: Eig enstate deformations as a sensitive probe of quantum chaos\nby Anatoli Polkovnikov (Boston University) as part of Quantum Matter meets Maths (IS T\, Lisbon)\n\n\nAbstract\nIn this talk I will discuss how one can detect quantum chaos in generic interacting models using adiabatic transformation s\, specifically the fidelity susceptibility. In particular\, I will show that it exhibits a very sharp crossover behavior from the algebraic to the exponential scaling form with the system size in the presence of a small integrability breaking parameter. This sensitivity allows one to identify tiny integrability breaking perturbations\, not detectable by conventional methods. I will also discuss that generically integrable and chaotic regi mes are separated by a universal regime of “maximal chaos” where the f idelity susceptibility saturates its upper bound and the system exhibits e xponentially slow\, glassy dynamics. I will illustrate how this probe work s using several examples of both clean and disordered systems and\, in par ticular\, will argue that numerical results indicate absence of a continuo us many-body localization transition in the thermodynamic limit.\n LOCATION:https://researchseminars.org/talk/QM3/35/ END:VEVENT END:VCALENDAR