@article{TEXTUAL,
      recid = {11673},
      author = {Glorioso, Paolo and Gromov, Andrey and Ryu, Shinsei},
      title = {Effective response theory for Floquet topological systems},
      journal = {Physical Review Research},
      address = {2021-02-08},
      number = {TEXTUAL},
      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.},
      url = {http://knowledge.uchicago.edu/record/11673},
}