Electron Interaction Effects in Periodically Driven Kitaev Model:   Topology Breaking and Enhancement of Quantum Chaos
  The effect of electron-electron interaction on Floquet topological superconducting chains is investigated numerically through full diagonalization and time evolution. The preservation of topology in the weak interacting regime is represented by a many-body form of the Majorana survival probability, and the emergence of chaos is characterized using the level statistics. In the presence of weak interaction, there appear a multitude of avoided crossings in quasi-energy spectra, and the resulting chaos is not full but can coexist with the topology. Strong interaction will lead the system into a topologically trivial and fully chaotic phase. 
Wei.Su, M.N.Chen, L. B. Shao, L. Sheng and D. Y. Xing
cond-mat.str-el