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SUMMARY:Interaction instability of localization in quasiperiodic systems -
  Prof. Marko Žnidarič\,  University of Ljubljana\, Slovenia
DTSTART:20180619T143000Z
DTEND:20180619T153000Z
UID:TALK107467@talks.cam.ac.uk
CONTACT:Dr Ulrich Schneider
DESCRIPTION:For classical systems with a finite number of degrees of freed
 om KAM theorem guarantees stability of integrable systems for sufficiently
  small perturbations. How about quantum systems in the thermodynamic limit
 ? \nI will present results showing that systems with quasiperiodic potenti
 al can behave completely differently than random ones\, where dynamics smo
 othly changes. Namely\, for small interactions there is a discontinuous ch
 ange from localization to diffusion. Implications for possible many-body l
 ocalization will be discussed. I will also briefly mention exact results f
 or entanglement dynamics in a putative many-body localized system describe
 d by a so-called l-bit Hamiltonian\, showing that the growth is not just l
 ogarithmic in time as believed so far.
LOCATION:Ryle Seminar Room (930) 
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