Shaping of the finite-size chaos crossover in Floquet circuits by coherent-mismatch architecture
Abstract
We study how the spatial profile of a deterministic coherent gate perturbation affects finite-size quasienergy statistics and operator dynamics in U(1)-symmetric XXZ Floquet circuits. Using a shared homogeneous reference, we compare a single modified bond with an alternating perturbation applied across the whole chain. After separating symmetry sectors and checking several known integrable forms, we find that the alternating circuits move toward circular orthogonal ensemble level statistics and change operator-space entanglement and out-of-time-order correlations at smaller local amplitudes than the single defects. For intermediate numbers of modified bonds, the response is nonmonotonic and also depends on where the bonds are placed, so bond density alone is not enough. A perturbative analysis identifies the additive weight of many modified bonds, while coherent spatial interference reshapes the coupling between nearby eigenstates.
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BibTeX
@misc{tan2026shaping,
title = {{Shaping of the finite-size chaos crossover in Floquet circuits by coherent-mismatch architecture}},
author = {Xiangjun Tan and Wenqi Liu and Hanjie Zhu and Wenkai Bai and Zhanning Wang},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.31391},
eprint = {2609.31391},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.31391},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Shaping of the finite-size chaos crossover in Floquet circuits by coherent-mismatch architecture
AU - Xiangjun Tan
AU - Wenqi Liu
AU - Hanjie Zhu
AU - Wenkai Bai
AU - Zhanning Wang
PY - 2026
DA - 2026/09/25
PB - arXiv
DO - 10.48550/arxiv.2609.31391
UR - https://arxiv.org/abs/2609.31391
AB - We study how the spatial profile of a deterministic coherent gate perturbation affects finite-size quasienergy statistics and operator dynamics in U(1)-symmetric XXZ Floquet circuits. Using a shared homogeneous reference, we compare a single modified bond with an alternating perturbation applied across the whole chain. After separating symmetry sectors and checking several known integrable forms, we find that the alternating circuits move toward circular orthogonal ensemble level statistics and change operator-space entanglement and out-of-time-order correlations at smaller local amplitudes than the single defects. For intermediate numbers of modified bonds, the response is nonmonotonic and also depends on where the bonds are placed, so bond density alone is not enough. A perturbative analysis identifies the additive weight of many modified bonds, while coherent spatial interference reshapes the coupling between nearby eigenstates.
ER -