Effective response theory for Floquet topological systems

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Abstract

We present an effective field theory approach to the topological response of Floquet systems with symmetry group G. This is achieved by introducing a background G gauge field in the Schwinger-Keldysh formalism, which is suitable for far from equilibrium systems. We carry out this program for chiral topological Floquet systems (anomalous Floquet-Anderson insulators) in two spatial dimensions and the group cohomology models of topological Floquet unitaries. These response actions serve as many-body topological invariants for topological Floquet unitaries. The effective action approach also leads us to propose topological response functions that were not considered before. For a particular family of models, we find that our response theory captures a symmetry protected version of the chiral unitary index.

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Glorioso, P., Gromov, A., & Ryu, S. (2021). Effective response theory for Floquet topological systems. Physical Review Research, 3(1). https://doi.org/10.1103/PhysRevResearch.3.013117

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