@article{WOS:000637845300002,
 abstract = {We consider a clean quantum system subject to strong periodic driving.
The existence of a dominant energy scale, h(D)(x), can generate
considerable structure in an effective description of a system that, in
the absence of the drive, is nonintegrable and interacting, and does not
host localization. In particular, we uncover points of freezing in the
space of drive parameters (frequency and amplitude). At those points,
the dynamics is severely constrained due to the emergence of an almost
exact, local conserved quantity, which scars the entire Floquet spectrum
by preventing the system from heating up ergodically, starting from any
generic state, even though it delocalizes over an appropriate subspace.
At large drive frequencies, where a naive Magnus expansion would predict
a vanishing effective (average) drive, we devise instead a strong-drive
Magnus expansion in a moving frame. There, the emergent conservation law
is reflected in the appearance of the ``integrability″ of an
effective Hamiltonian. These results hold for a wide variety of
Hamiltonians, including the Ising model in a transverse field in any
dimension and for any form of Ising interaction. The phenomenon is also
shown to be robust in the presence of two-body Heisenberg interactions
with any arbitrary choice of couplings. Furthermore, we construct a
real-time perturbation theory that captures resonance phenomena where
the conservation breaks down, giving way to unbounded heating. This
approach opens a window on the low-frequency regime where the Magnus
expansion fails.},
 article-number = {021008},
 author = {Haldar, Asmi and Sen, Diptiman and Moessner, Roderich and Das, Arnab},
 doi = {10.1103/PhysRevX.11.021008},
 issn = {2160-3308},
 journal = {PHYSICAL REVIEW X},
 month = {APR 7},
 number = {2},
 title = {Dynamical Freezing and Scar Points in Strongly Driven Floquet Matter:
Resonance vs Emergent Conservation Laws},
 unique-id = {WOS:000637845300002},
 volume = {11},
 year = {2021}
}