@article{ISI:000537154000016,
 abstract = {The presence of quantum scars, athermal eigenstates of a many-body
Hamiltonian with finite-energy density, leads to an absence of
ergodicity and long-time coherent dynamics starting from initial states
that have a high overlap with scars as experimentally observed in a
chain of ultracold Rydberg atoms. We show, via study of a periodically
driven Rydberg chain, that the drive frequency acts as a tuning
parameter for several reentrant transitions between ergodic and weak
ergodicity breaking regimes. The former regime shows rapid
thermalization of correlation functions and absence of scars in the
Floquet spectrum of the system. The latter regime, in contrast, has
scars; they lead to long-time coherent dynamics of correlation
functions. We provide an analytical explanation of the existence of
these regimes by going beyond a high-frequency Magnus expansion and
using a novel perturbative approach valid at large drive amplitudes to
derive a Floquet Hamiltonian which qualitatively explains the behavior
of the driven system at arbitrary frequencies. We also discuss
experiments involving finite Rydberg chains which can validate our
theory. Our results demonstrate the possibility of
drive-frequency-induced tuning between ergodic and weak ergodicity
breaking dynamics in a disorder-free quantum many-body system.},
 article-number = {245107},
 author = {Mukherjee, Bhaskar and Nandy, Sourav and Sen, Arnab and Sen, Diptiman
and Sengupta, K.},
 doi = {10.1103/PhysRevB.101.245107},
 eissn = {2469-9969},
 issn = {2469-9950},
 journal = {PHYSICAL REVIEW B},
 month = {JUN 1},
 number = {24},
 orcid-numbers = {Mukherjee, Bhaskar/0000-0003-0919-9362},
 times-cited = {3},
 title = {Collapse and revival of quantum many-body scars via Floquet engineering},
 unique-id = {ISI:000537154000016},
 volume = {101},
 year = {2020}
}