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URL:https://murmitoyen.com/events/vanille/udem/detail/822186-new-quantum-ma
 ny-body-states-enabled-by-ergodicity-breakdown-dmitry-abanin-universite-de
 -geneve
LOCATION:Pavillon Roger-Gaudry \, 2900\, boul. Édouard-Montpetit\, Local M
 -415\, Montréal\, QC\, Canada
SUMMARY:New quantum many-body states enabled by ergodicity breakdown - Dmit
 ry Abanin (Université de Genève)
DESCRIPTION:The experimental advances in synthetic quantum systems\, such a
 s ultracold atoms\, have enabled researchers to probe quantum thermalizati
 on and its breakdown. Thermalization occurs in ergodic systems and “eras
 es” quantum information contained in the initial many-body states. There
 fore\, to create long-lived quantum states\, it is of particular interest 
 to find mechanisms of thermalization breakdown. One way of suppressing the
 rmalization is by introducing quenched disorder\, which may induce many-bo
 dy localization (MBL) [1]. Surprisingly\, MBL systems may also avoid heati
 ng under periodic driving\, which opens up the possibility of having stabl
 e\, Floquet-MBL phases with unusual properties. I will discuss one example
  of such a phase – a two-dimensional Anomalous Floquet Insulator\, chara
 cterized by fully localized bulk states and chiral\, thermalizing edge sta
 tes [2].
\n 
\nFurther\, I will argue that MBL may not be the only way to
  break ergodicity. I will propose another mechanism\, “quantum many-body
  scarring”\, which bears a similarity to the well-known phenomenon of qu
 antum scars in few-body chaos\, and leads to a weaker form of ergodicity b
 reaking in a many-body system of Rydberg atoms [3]. Quantum scarring gives
  rise to a set of non-thermal many-body wave functions immersed in the the
 rmalizing background\; when the system is initialized in the physical stat
 es which have a high overlap with the non-thermal states\, it exhibits man
 y-body revivals and lack of thermalization\, which have been observed in a
  recent experiment by the Harvard-MIT groups [4]. 
\n References
\n [1]
  For a review\, see D. A. Abanin\, E. Altman\, I. Bloch\, M. Serbyn\, arXi
 v:1804.11065 (2018).
\n[2] Nathan\, D. A. Abanin\, E. Berg\, N. Lindner\, 
 M. Rudner\, arXiv:1712.02789 (2018).
\n[3] Turner\, A. Michailidis\, D. A.
  Abanin\, M. Serbyn\, Z. Papic\, Nature Physics (2018) doi:10.1038/s41567-
 018-0137-5.
\n[4] Bernien et al\, Nature 551\, 579 (2017).
\n 
\nLa conf
 érence est pour tout public et le café est servi dès 11h30.
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