Dressed Floquet scars from protected zero modes in a Rydberg chain

Abstract:We show that a symmetry-protected Floquet nullspace can host anomalous many-body eigenstates that are obtained by projecting structured parent states onto an exact zero-quasienergy sector. We demonstrate this in a periodically driven PXP chain with an exponentially large (in system size) protected nullspace. Over the accessible system sizes, special parent states show an exponentially increasing enhancement of their nullspace weight relative to the typical value, even as their absolute overlaps decrease. The resulting Floquet scars can therefore become globally orthogonal to their parents while retaining anomalous correlations inherited from them. We demonstrate this mechanism for two contrasting parents: a locally rotated volume-entangled Ivanov-Motrunich scar and the unentangled Rydberg vacuum. Floquet perturbation theory captures the weak-dressing regime, while exact diagonalization shows persistence into nonperturbative regimes where the Floquet Hamiltonian generically contains increasingly nonlocal terms. Our results identify projection into a protected zero-quasienergy sector as a route to Floquet quantum many-body scars.

Quantum Gases (cond-mat.quant-gas); Strongly Correlated Electrons (cond-mat.str-el); Quantum Physics (quant-ph)

arXiv:2606.15605 [cond-mat.quant-gas]

(or arXiv:2606.15605v2 [cond-mat.quant-gas] for this version)

https://doi.org/10.48550/arXiv.2606.15605 Focus to learn more arXiv-issued DOI via DataCite

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