Emergent SU(2) dynamics and perfect quantum many-body scars
Abstract
Motivated by recent experimental observations of coherent many-body revivals in a constrained Rydberg atom chain, we construct a weak quasi-local deformation of the Rydberg blockade Hamiltonian, which makes the revivals virtually perfect. Our analysis suggests the existence of an underlying non-integrable 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 towards establishing the stability of quantum many-body scars in the thermodynamic limit.
Cite
@article{arxiv.1812.05561,
title = {Emergent SU(2) dynamics and perfect quantum many-body scars},
author = {Soonwon Choi and Christopher J. Turner and Hannes Pichler and Wen Wei Ho and Alexios A. Michailidis and Zlatko Papić and Maksym Serbyn and Mikhail D. Lukin and Dmitry A. Abanin},
journal= {arXiv preprint arXiv:1812.05561},
year = {2019}
}
Comments
6+11 pages, 3+6 figures