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SUMMARY:Quantum many-body scars - Dr. Zlatko Papić\, University of Leeds
DTSTART:20181129T141500Z
DTEND:20181129T151500Z
UID:TALK108823@talks.cam.ac.uk
CONTACT:Katarzyna Macieszczak
DESCRIPTION:Recent experiments on large chains of Rydberg atoms [H. Bernie
 n et al.\, Nature 551\, 579 (2017)] have demonstrated the possibility of r
 ealizing 1D systems with locally constrained Hilbert spaces\, along with s
 ome surprising signatures of non-ergodic dynamics\, such as persistent osc
 illations following a quench from the Néel product state. In this talk we
  will argue that this phenomenon is a manifestation of a "quantum many-bod
 y scar"\, i.e.\, a concentration of extensively many eigenstates of the sy
 stem around special many-body states [1]. The special states are analogs o
 f unstable classical periodic orbits in the single-particle quantum billia
 rds. I will present a model based on a single particle hopping on the Hilb
 ert space graph\, which quantitatively captures the scarred wave functions
  up to large systems of 32 atoms. These results suggest that scarred many-
 body bands give rise to a new universality class of quantum dynamics\, whi
 ch opens up opportunities for creating and manipulating novel states with 
 long-lived coherence in systems that are now amenable to experimental stud
 y.\n\n[1] C. J. Turner\, A. A. Michailidis\, D. A. Abanin\, M. Serbyn\, Z.
  Papić\, Nat. Phys\, 14\, 745 (2018).\n
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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