Choi, S, Turner, CJ, Pichler, H et al. (6 more authors) (2019) Emergent SU(2) dynamics and perfect quantum many-body scars. Physical Review Letters, 122 (22). 220603. ISSN 0031-9007
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.
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Copyright, Publisher and Additional Information: | © 2019 American Physical Society. This is an author produced version of a paper published in Physical Review Letters. Uploaded in accordance with the publisher's self-archiving policy. | ||||||
Keywords: | quant-ph; quant-ph; cond-mat.stat-mech; cond-mat.str-el | ||||||
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Institution: | The University of Leeds | ||||||
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds) | ||||||
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Depositing User: | Symplectic Publications | ||||||
Date Deposited: | 30 May 2019 15:39 | ||||||
Last Modified: | 16 Jun 2019 15:20 | ||||||
Status: | Published | ||||||
Publisher: | American Physical Society | ||||||
Identification Number: | https://doi.org/10.1103/PhysRevLett.122.220603 | ||||||
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