Out-of-time-order correlations in the quasiperiodic Aubry-André model

We study out-of-time-ordered correlators (OTOC) in a free fermionic model with a quasiperiodic potential. This model is equivalent to the Aubry-André model and features a phase transition from an extended phase to a localized phase at a nonzero value of the strength of the quasiperiodic potential. We investigate five different time regimes of interest for out-of-time-ordered correlators: early, wave front, x=vBt, late time equilibration, and …