The topological response of 2D chiral Floquet drives is a Schwinger-Keldysh theta term with coefficient Θ(α) = π(1 - tanh(α/2)), quantized by particle-hole symmetry.
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Effective response theory for Floquet topological systems
The topological response of 2D chiral Floquet drives is a Schwinger-Keldysh theta term with coefficient Θ(α) = π(1 - tanh(α/2)), quantized by particle-hole symmetry.