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DTSTART:20170326T030000
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DTSTART:20171029T020000
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BEGIN:VEVENT
DTSTAMP:20260428T211926Z
UID:593e7ce54d855468842640@ist.ac.at
DTSTART:20171003T110000
DTEND:20171003T123000
DESCRIPTION:Speaker: Alexios Michailidis\nhosted by Maksym Serbyn\nAbstract
 : Quantum many-body systems can exhibit a dynamical phase transition to a 
 non-ergodic phase nowadays known as many-body localization (MBL). MBL syst
 ems feature vanishing conductivity and a logarithmic spreading of informat
 ion\, unlike typical many-body systems where conductivity is finite and in
 formation spreads ballistically. An MBL system can be understood as the an
 alogue of Anderson insulator in the presence of interactions\, thus its ex
 istence is tied to the presence of disorder in the system. An active area 
 of research is understanding whether disorder is an essential ingredient f
 or localization\, or whether an interaction-induced MBL phase is possible.
  We identify a family of strongly subdiffusive\, translation-invariant sys
 tems [1] by studying the spreading of information following a global quenc
 h. For the experimentally accessible timescales we show that these systems
  are indistinguishable from MBL systems. Furthermore\, we develop a time-d
 ependent degenerate perturbation theory (tDPT) to explain the decay of inh
 omogeneity in the system's initial condition. We identify a finite order i
 n tDPT where the dynamics induced by the perturbed Hamiltonian is enough t
 o delocalize the system. This method provides new insights into the long-t
 ime behaviour and the mechanisms of delocalisation in short-range interact
 ing systems.[1] Alexios A. Michailidis et al.\, arXiv: 1706.05026 (2017)
LOCATION:Big Seminar room Ground floor / Office Bldg West (I21.EG.101)\, IS
 TA
ORGANIZER:jdeanton@ist.ac.at
SUMMARY:Alexios Michailidis: Strongly subdiffusive dynamics in disorder-fre
 e quantum many-body systems
URL:https://talks-calendar.ista.ac.at/events/829
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