The Floquet winding number of two-dimensional anomalous driven systems equals the quantized Chern-Simons axion angle built from Floquet eigenstates, linking bulk geometry to a magnetoelectric response.
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Quantized Chern-Simons Axion Coupling in Anomalous Floquet Systems
The Floquet winding number of two-dimensional anomalous driven systems equals the quantized Chern-Simons axion angle built from Floquet eigenstates, linking bulk geometry to a magnetoelectric response.