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arXiv · 2604.23420

Boundary-Robust Transmission Asymmetry as a Topological Signature in Open Floquet Lattices

Ren Zhang·Xiao-Yu Ouyang·Xu-Dong Dai·Xi Dai
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Abstract

We identify a boundary-robust topological signature of open Floquet lattices: although nonadiabatic boundaries strongly reshape the transmission lineshape, the integrated left--right transmission asymmetry saturates to a plateau set by the bulk Floquet winding number. Its origin is a deep-bulk branch-population principle: in the long-sample limit, each propagating Floquet--Bloch branch is generically populated with unit weight, since true Floquet bound states are nongeneric. The robust observable is therefore the cumulative transmission imbalance rather than the boundary-sensitive transmission profile. We propose direct detection by cold-atom transmission spectroscopy. For electronic transport, the same asymmetry admits contact-model-dependent electrical readouts: a coherent Floquet--Landauer--B\"uttiker interpretation predicts a near-\(2ef\) response in weak SAW devices, whereas a blocking-factor post-processing yields a qualitatively different signal.

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Ren Zhang, Xiao-Yu Ouyang, Xu-Dong Dai, Xi Dai. 2026-04-25. Boundary-Robust Transmission Asymmetry as a Topological Signature in Open Floquet Lattices. https://arxiv.org/abs/2604.23420

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