Emergent SU(2) Dynamics and Perfect Quantum Many-Body Scars

Soonwon Choi, Christopher J. Turner, Hannes Pichler, Wen Wei Ho, Alexios A. Michailidis, Zlatko Papić, Maksym Serbyn, Mikhail D. Lukin, Dmitry A. Abanin

Research output: Contribution to journalArticlepeer-review

203 Scopus citations


Motivated by recent experimental observations of coherent many-body revivals in a constrained Rydberg atom chain, we construct a weak quasilocal deformation of the Rydberg-blockaded Hamiltonian, which makes the revivals virtually perfect. Our analysis suggests the existence of an underlying nonintegrable Hamiltonian which supports an emergent SU(2)-spin dynamics within a small subspace of the many-body Hilbert space. We show that such perfect dynamics necessitates the existence of atypical, nonergodic energy eigenstates - quantum many-body scars. Furthermore, using these insights, we construct a toy model that hosts exact quantum many-body scars, providing an intuitive explanation of their origin. Our results offer specific routes to enhancing coherent many-body revivals and provide a step toward establishing the stability of quantum many-body scars in the thermodynamic limit.

Original languageEnglish (US)
Article number220603
JournalPhysical review letters
Issue number22
StatePublished - Jun 7 2019
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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